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Theses & Dissertations

Citing a published thesis, citing an unpublished thesis, citing a thesis in online database or repository.

• CMS 14.224: Theses and dissertations

Titles of unpublished works appear in "quotation marks"—not in italics . This treatment extends to theses and dissertations, which are otherwise cited like books.

The kind of thesis, the academic institution, and the date follow the title. Like the publication data of a book, these are enclosed in parentheses in a note but not in a bibliography.

If the document was consulted online, include a URL or, for documents retrieved from a commercial database, give the name of the database and, in parentheses, any identification number supplied or recommended by the database.

For dissertations issued on microfilm, see 14.120 . For published abstracts of dissertations, see 14.197 .

Note-Bibliography

First-name Last-name, "Title of Thesis: Subtitle," (Publisher, Year).

      Mihwa Choi, “Contesting Imaginaires in Death Rituals during the Northern Song Dynasty,” PhD diss., (University of Chicago, 2008).

Short Note:

Last-name, "Title of Thesis."

Choi. “Contesting Imaginaires ."

Bibliography Entry:

Last-name, First-name. "Title of Thesis: Subtitle." Year.

Choi, Mihwa. “Contesting Imaginaires in Death Rituals during the Northern Song Dynasty.” PhD diss. University      of Chicago, 2008.

Author-Date

Text Citation:

(Last-name Year)

(Mihwa 2008)

Reference Entry:

Last-name, First-name. Year. "Title of Thesis: Subtitle."

Choi, Mihwa. 2008. “Contesting  Imaginaires  in Death Rituals during the Northern Song Dynasty.”  PhD diss.       University of Chicago.

Note -Bibliography

Note #. First-name Last-name, "Title of Thesis: Subtitle," Unpublished thesis type, University. Year.

Barry C. Hosking, "The Control of Gastro-intestinal Nematodes in Sheep with the Amino-acetonitrile Derivative, Monepantel with a Particular Focus on Australia and New Zealand," PhD diss., (Ghent University, 2010).

Note #. Last-name,"Title of Thesis."

Barry C. Hosking, "The Control of Gastro-intestinal Nematodes."

Bibliography:

Last-name, First-name. "Title of Thesis: Subtitle." Unpublished thesis type. University. Year.

Hosking, Barry C. "The Control of Gastro-intestinal Nematodes in Sheep with the Amino-acetonitrile Derivative, Monepantel with a Particular Focus on Australia and New Zealand." PhD diss., Ghent University, 2010.

(Hosking 2010)

Last-name, First-name.  Year.  "Title of Thesis: Subtitle." Unpublished thesis type. University.

Hosking, Barry C.    2010.  "The Control of Gastro-intestinal Nematodes in Sheep with the Amino-acetonitrile Derivative, Monepantel with a Particular Focus on Australia and New Zealand." PhD diss., Ghent University.

Note #. First-name Last-name, "Title of Thesis: Subtitle," Database Name (Identifier if given), Year, Internet address.

      12. Meredith Stewart, "An Investigation into Aspects of the Replication of Jembrana Disease Virus, " Australasian Digital Theses Program (WMU2005.1222), 2005, http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20051222.104106.

Note #. Last-name, "Title of Thesis."

21. Stewart, "An Investigation into Aspects."

Last-name, First-name. "Title of Thesis: Subtitle." Database Name (Identifier if given), Year. Internet address.

Stewart, Meredith. "An Investigation into Aspects of the Replication of Jembrana Disease Virus ." Australasian Digital Theses Program (WMU2005.1222),  2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20051222.104106.

(Stewart 2005)

Last-name, First-name. Year. "Title of Thesis: Subtitle."  Database Name  (Identifier if given), Internet address.

Stewart, Meredith. 2005. "An Investigation into Aspects of the Replication of Jembrana Disease Virus ." Australasian Digital Theses Program  (WMU2005.1222),    http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20051222.104106.

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Home / Guides / Citation Guides / Chicago Style / How to Cite a Thesis/Dissertation in Chicago/Turabian

How to Cite a Thesis/Dissertation in Chicago/Turabian

Academic theses and dissertations can be a good source of information when writing your own paper. They are usually accessed via a university’s database or a third party database, or found on the web. The main difference between a thesis and a dissertation is the degree type they are submitted for:

• Thesis—A document submitted to earn a degree, such as a master’s degree, at a university.
• Dissertation—A document submitted to earn an advanced degree, such as a doctorate, at a university.

This guide will show you how to create notes-bibliography style citations for theses and dissertations in a variety of formats using the 17th edition of the  Chicago Manual of Style.

Guide Overview

• Citing a thesis or dissertation from a database
• Citing a thesis or dissertation from the web
• Citing an unpublished thesis or dissertation

Citing a Thesis or Dissertation from a Database

Citation structure.

1. First name Last name, “Title” (master’s thesis or PhD diss., University Name, year published), page number, Database (Identification Number).

Bibliography:

Last name, First name. “Title.” Master’s thesis or PhD diss., University Name, year published. Database (Identification Number).

Citation Example

1. Kimberly Knight,  “Media Epidemics: Viral Structures in Literature and New Media” (PhD diss., University of California, Santa Barbara, 2011), 17, MLA International Bibliography (2013420395).

Knight, Kimberly.  “Media Epidemics: Viral Structures in Literature and New Media.” PhD diss., University of California, Santa Barbara, 2011. MLA International Bibliography (2013420395).

Citing a Thesis or Dissertation from the Web

1. First name Last name, “Title” (master’s thesis or PhD diss., University Name, year published), page number, URL.

Last name, First name. “Title.” Master’s thesis or PhD diss., University Name, year published. URL.

1. Peggy Lynn Wilson, “Pedagogical Practices in the Teaching of English Language in Secondary Public Schools in Parker County” (PhD diss., University of Maryland, College Park, 2011), 25, https://drum.lib.umd.edu/bitstream/1903/11801/1/Wilson_umd_0117E_12354.pdf.

Wilson, Peggy Lynn. “Pedagogical Practices in the Teaching of English Language in Secondary Public Schools in Parker County.” PhD diss., University of Maryland, College Park, 2011. https://drum.lib.umd.edu/bitstream/1903/11801/1/Wilson_umd_0117E_12354.pdf.

Citing an Unpublished Thesis or Dissertation

In rare cases, you may need to cite a thesis or dissertation that has not yet been published. This is particularly the case if you want to cite your own work or the work of a colleague.

1. First name Last name, “Title” (unpublished manuscript, Month Day, Year last modified), format.

Last name, First name. “Title.” Unpublished manuscript, last modified Month Day, Year. Format.

1. John Doe, “A Study of Generic Topic” (unpublished manuscript, June 19, 2021), Microsoft Word file.

Doe, John. “A Study of Generic Topic.” Unpublished manuscript, last modified June 19, 2021. Microsoft Word file.

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How to cite a dissertation in Chicago

To cite a dissertation thesis in a reference entry in Chicago style 17th edition include the following elements:

• Author(s) of the dissertation: Give first the last name, then the name as presented in the source (e. g. Watson, John). For two authors, reverse only the first name, followed by ‘and’ and the second name in normal order (e. g. Watson, John, and John Watson). For more than seven authors, list the first seven names followed by et al.
• Title of the dissertation: Give the title in quotation marks.
• Degree: Type of degree.
• University: Give the name of the institution.
• Year of publication: Give the year of publication as presented in the source.

Here is the basic format for a reference list entry of a dissertation thesis in Chicago style 17th edition:

Author(s) of the dissertation . " Title of the dissertation ." Degree , University , Year of publication .

Take a look at our reference list examples that demonstrate the Chicago style guidelines in action:

A doctoral dissertation with one author

Guo, Jia . " Trust-based Service Management of Internet of Things Systems and Its Applications ." Doctoral dissertation , Virginia Tech , 2018 .

Neel, Breta L . " Three Flute Chamber Works by Alberto Ginastera: Intertwining Elements of Art and Folk Music ." Doctoral dissertation , Nebraska-Lincoln University , 2017 .

This citation style guide is based on the Chicago Manual of Style (17 th edition).

More useful guides

• Chicago Citation Quickguide
• How to Cite A Dissertation
• Citing and referencing: University theses and dissertations

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Citation Help: Dissertations & Theses

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A quick note:

The following examples follow the Notes-Bibliography style. For Author-Date style, please consult The Chicago Manual of Style 17th Edition.

Chicago AND Turabian Citation Examples: Dissertations & Theses

Chicago and Turabian use the exact same format for citing dissertations and theses.

Important Elements:

• Author 
• Title of Dissertation or Thesis
• Type of Document (Dissertation or Thesis)
• Name of Degree Granting Institution

Thesis or dissertation

1. Author First Last, "Title of Dissertation or Theis" (Doctoral diss. or Master's Thesis, Name of Institution, Year), pp.-pp.

1. Dana S. Levin, "Let's Talk about Sex . . . Education: Exploring Youth Perspectives, Implicit Messages, and Unexamined Implications of Sex Education in Schools" (PhD diss., University of Michigan, 2010), 101-2.

Shortened note

2. Author Last, "Shortened Title," pp.

2. Levin, "Let's Talk about Sex," 98.

Bibliography Entry

Author Last, First. "Title of Dissertation or Thesis." Doctoral diss. or Master's Thesis, Name of Institution, Year.

Levin, Dana S. "Let's Talk about Sex . . . Education: Exploring Youth Perspectives, Implicit Messages, and Unexamined Implications of Sex Education in Schools." PhD diss., University of Michigan, 2010.

Examples courtesy of  The Turabian 8th edition .

Chicago/Turabian Examples by Source

•    Articles
•    Audio & Video
•    Books
•    Dictionaries & Encyclopedias
•    Dissertations & Theses
•    Websites, Including Social Media
•    Other Source Types

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Useful Resources for Chicago/Turabian

Check out the  Chicago Manual of Style's Shop Talk website  for more great information about using the Chicago Manual of Style through the links below!

• Shop Talk for Students
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• What's the difference between Chicago and Turabian?!?

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Cite A Dissertation in Chicago Manual of Style citation style

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Notes-Bibliography Format

Reference list.

Place this part in your bibliography or reference list at the end of your assignment.

In-text citation

Place this part right after the quote or reference to the source in your assignment.

Author-Date Format

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Chicago Referencing Guide

• Notes - basic patterns
• Bibliography - basic patterns
• Chapters and other parts of a book
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Thesis - general pattern

Thesis, dissertation or exegesis, type of thesis.

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• Tables - Examples
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Bibliography:

Thesis and dissertation can mean different things, depending on which institution the work is from.

At Auckland University of Technology (and other NZ universities):

• Thesis is used either for a doctoral or a master's degree.
• Dissertation is used either for a master's or a bachelor's degree with honours.
• Exegesis is the written component of a practice-based thesis where the major output is a creative work;  e.g. a film, artwork, novel.

In some other parts of the world, such as the United States, a dissertation may be used for a doctoral degree and a thesis   used for a master's degree. You can use the same citation pattern, no matter what the type of thesis is called.

List the type of thesis as it appears on the title page, but abbreviate dissertation as diss .

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Chicago Citation Style, 17th Edition: Thesis or Dissertation

• Bibliography
• One Author or Editor
• Multiple Authors or Editors
• Author and Editor
• Author and Translator
• Organization as Author
• Anonymous Work
• Chapter from an Edited Work
• Multivolume Work
• Edition Other than the First
• Dictionary or Encyclopedia
• Journal Article
• Magazine Article
• Newspaper Article
• Book Review
• Basic Webpage
• Blogs and Social Media
• Government Website
• Audio/Video Recording
• Online Multimedia
• Interview or Personal Communication
• Lecture or Presentation
• Primary Source Published in an Edited Collection
• Thesis or Dissertation
• Pamphlet or Brochure
• Sacred Text
• Indirect Source
• Government Document
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• AI Generated Content
• Plagiarism This link opens in a new window

Thesis or Dissertation (14.215)

Example 1 – Print

N:           1. Lindsey Bingley, "From Overalls to Aprons? The Paid and Unpaid Labour of Southern Alberta Women, 1939-1959" (master's thesis, University of Lethbridge, 2006), 58.

B:     Bingley, Lindsey. "From Overalls to Aprons? The Paid and Unpaid Labour of Southern Alberta Women,              1939-1959." Master's thesis, University of Lethbridge, 2006.

Example 2 – Online (Commercial Database)

N:           1. Libra Rose Hilde, "Worth a Dozen Men: Women, Nursing, and Medical Care during the American Civil War" (PhD diss., Harvard University, 2003), 295, ProQuest ( 3091579).

B:     Hilde, Libra Rose. "Worth a Dozen Men: Women, Nursing, and Medical Care during the American              Civil War." PhD diss., Harvard University, 2003. ProQuest (3091579).

Example 3 – Online (Institutional Repository)

N:           1. Hiroshi Ishida, "A Geography of Contemporary Maori Agriculture." (PhD diss., University of Auckland, 1966), 110-16, https://researchspace.auckland.ac.nz/handle/2292/2489.

B:     Ishida, Hiroshi. "A Geography of Contemporary Maori Agriculture" PhD diss., University of Auckland,              1966. https://researchspace.auckland.ac.nz/handle/2292/2489.

Help & Guide Contents

Home General Guidelines     Notes     Bibliography Books     One Author or Editor     Multiple Authors or Editors     Author and Editor     Author and Translator     Organization as Author     Anonymous Work     Chapter from an Edited Work     Multivolume Work     Edition Other than the First     Dictionary or Encyclopedia     E-Book Articles     Journal Article     Magazine Article     Newspaper Article     Book Review Websites     Basic Webpage     Blogs and Social Media     Government Website Audiovisual Media     Audio/Video Recording     Online Multimedia Other Sources     Interview or Personal Communication     Lecture or Presentation    Primary Source Published in an Edited Collection     Thesis or Dissertation     Pamphlet or Brochure     Sacred Text     Indirect Source     Government Document     Paintings, Illustrations, Tables Plagiarism

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Chicago 17th edition notes and bibliography

• Introduction
• Author, title, date
• Book chapter
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• Journal article
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• Book review
• Dictionary or encyclopaedia

Citing theses

• Personal communication
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Titles of theses and dissertations appear in quotation marks otherwise they are cited like books.

The kind of thesis, the academic institution, and the date follow the title. Like the publication data of a book, these are enclosed in parentheses in a note but not in a bibliography.

If the document was consulted online, include a URL or, for documents retrieved from a commercial database, the name of the database and, in parentheses, any identification number supplied or recommended by the database.

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Go to Index

Author-Date: Sample Citations

Go to Notes and Bibliography: Sample Citations

The following examples illustrate the author-date system. Each example of a reference list entry is accompanied by an example of a corresponding in-text citation. For more details and many more examples, see chapter 15 of The Chicago Manual of Style . For examples of the same citations using the notes and bibliography system, follow the Notes and Bibliography link above.

Reference list entries (in alphabetical order)

Grazer, Brian, and Charles Fishman. 2015. A Curious Mind: The Secret to a Bigger Life . New York: Simon & Schuster.

Smith, Zadie. 2016. Swing Time . New York: Penguin Press.

In-text citations

(Grazer and Fishman 2015, 12)

(Smith 2016, 315–16)

For more examples, see 1 5 . 40 – 45 in The Chicago Manual of Style .

Chapter or other part of an edited book

In the reference list, include the page range for the chapter or part. In the text, cite specific pages.

Reference list entry

Thoreau, Henry David. 2016. “Walking.” In The Making of the American Essay , edited by John D’Agata, 167–95. Minneapolis: Graywolf Press.

In-text citation

(Thoreau 2016, 177–78)

In some cases, you may want to cite the collection as a whole instead.

D’Agata, John, ed. 2016. The Making of the American Essay . Minneapolis: Graywolf Press.

(D’Agata 2016, 177–78)

For more details, see 15.36 and 15.42 in The Chicago Manual of Style .

Translated book

Lahiri, Jhumpa. 2016.  In Other Words . Translated by Ann Goldstein. New York: Alfred A. Knopf.

(Lahiri 2016, 146)

For books consulted online, include a URL or the name of the database in the reference list entry. For other types of e-books, name the format. If no fixed page numbers are available, cite a section title or a chapter or other number in the text, if any (or simply omit).

Austen, Jane. 2007. Pride and Prejudice . New York: Penguin Classics. Kindle.

Borel, Brooke. 2016. The Chicago Guide to Fact-Checking . Chicago: University of Chicago Press. ProQuest Ebrary.

Kurland, Philip B., and Ralph Lerner, eds. 1987. The Founders’ Constitution . Chicago: University of Chicago Press. http://press-pubs.uchicago.edu/founders/.

Melville, Herman. 1851. Moby-Dick; or, The Whale . New York: Harper & Brothers. http://mel.hofstra.edu/moby-dick-the-whale-proofs.html.

(Austen 2007, chap. 3)

(Borel 2016, 92)

(Kurland and Lerner 1987, chap. 10, doc. 19)

(Melville 1851, 627)

Journal article

In the reference list, include the page range for the whole article. In the text, cite specific page numbers. For articles consulted online, include a URL or the name of the database in the reference list entry. Many journal articles list a DOI (Digital Object Identifier). A DOI forms a permanent URL that begins https://doi.org/. This URL is preferable to the URL that appears in your browser’s address bar.

Keng, Shao-Hsun, Chun-Hung Lin, and Peter F. Orazem. 2017. “Expanding College Access in Taiwan, 1978–2014: Effects on Graduate Quality and Income Inequality.” Journal of Human Capital 11, no. 1 (Spring): 1–34. https://doi.org/10.1086/690235.

LaSalle, Peter. 2017. “Conundrum: A Story about Reading.” New England Review 38 (1): 95–109. Project MUSE.

Satterfield, Susan. 2016. “Livy and the Pax Deum .” Classical Philology 111, no. 2 (April): 165–76.

(Keng, Lin, and Orazem 2017, 9–10)

(LaSalle 2017, 95)

(Satterfield 2016, 170)

Journal articles often list many authors, especially in the sciences. If there are four or more authors, list up to ten in the reference list; in the text, list only the first, followed by et al . (“and others”). For more than ten authors (not shown here), list the first seven in the reference list, followed by et al.

Bay, Rachael A., Noah Rose, Rowan Barrett, Louis Bernatchez, Cameron K. Ghalambor, Jesse R. Lasky, Rachel B. Brem, Stephen R. Palumbi, and Peter Ralph. 2017. “Predicting Responses to Contemporary Environmental Change Using Evolutionary Response Architectures.” American Naturalist 189, no. 5 (May): 463–73. https://doi.org/10.1086/691233.

(Bay et al. 2017, 465)

For more examples, see 1 5 . 46–49 in The Chicago Manual of Style .

News or magazine article

Articles from newspapers or news sites, magazines, blogs, and the like are cited similarly. In the reference list, it can be helpful to repeat the year with sources that are cited also by month and day. Page numbers, if any, can be cited in the text but are omitted from a reference list entry. If you consulted the article online, include a URL or the name of the database.

Manjoo, Farhad. 2017. “Snap Makes a Bet on the Cultural Supremacy of the Camera.” New York Times , March 8, 2017. https://www.nytimes.com/2017/03/08/technology/snap-makes-a-bet-on-the-cultural-supremacy-of-the-camera.html.

Mead, Rebecca. 2017. “The Prophet of Dystopia.” New Yorker , April 17, 2017.

Pai, Tanya. 2017. “The Squishy, Sugary History of Peeps.” Vox , April 11, 2017. http://www.vox.com/culture/2017/4/11/15209084/peeps-easter.

Pegoraro, Rob. 2007. “Apple’s iPhone Is Sleek, Smart and Simple.” Washington Post , July 5, 2007. LexisNexis Academic.

(Manjoo 2017)

(Mead 2017, 43)

(Pegoraro 2007)

Readers’ comments are cited in the text but omitted from a reference list.

(Eduardo B [Los Angeles], March 9, 2017, comment on Manjoo 2017)

For more examples, see 15 . 49 (newspapers and magazines) and 1 5 . 51 (blogs) in The Chicago Manual of Style .

Book review

Kakutani, Michiko. 2016. “Friendship Takes a Path That Diverges.” Review of Swing Time , by Zadie Smith. New York Times , November 7, 2016.

(Kakutani 2016)

Stamper, Kory. 2017. “From ‘F-Bomb’ to ‘Photobomb,’ How the Dictionary Keeps Up with English.” Interview by Terry Gross. Fresh Air , NPR, April 19, 2017. Audio, 35:25. http://www.npr.org/2017/04/19/524618639/from-f-bomb-to-photobomb-how-the-dictionary-keeps-up-with-english.

(Stamper 2017)

Thesis or dissertation

Rutz, Cynthia Lillian. 2013. “ King Lear and Its Folktale Analogues.” PhD diss., University of Chicago.

(Rutz 2013, 99–100)

Website content

It is often sufficient simply to describe web pages and other website content in the text (“As of May 1, 2017, Yale’s home page listed . . .”). If a more formal citation is needed, it may be styled like the examples below. For a source that does not list a date of publication or revision, use n.d. (for “no date”) in place of the year and include an access date.

Bouman, Katie. 2016. “How to Take a Picture of a Black Hole.” Filmed November 2016 at TEDxBeaconStreet, Brookline, MA. Video, 12:51. https://www.ted.com/talks/katie_bouman_what_does_a_black_hole_look_like.

Google. 2017. “Privacy Policy.” Privacy & Terms. Last modified April 17, 2017. https://www.google.com/policies/privacy/.

Yale University. n.d. “About Yale: Yale Facts.” Accessed May 1, 2017. https://www.yale.edu/about-yale/yale-facts.

(Bouman 2016)

(Google 2017)

(Yale University, n.d.)

For more examples, see 1 5 . 50–52 in The Chicago Manual of Style . For multimedia, including live performances, see 1 5 . 57 .

Social media content

Citations of content shared through social media can usually be limited to the text (as in the first example below). If a more formal citation is needed, a reference list entry may be appropriate. In place of a title, quote up to the first 160 characters of the post. Comments are cited in reference to the original post.

Conan O’Brien’s tweet was characteristically deadpan: “In honor of Earth Day, I’m recycling my tweets” (@ConanOBrien, April 22, 2015).

Chicago Manual of Style. 2015. “Is the world ready for singular they? We thought so back in 1993.” Facebook, April 17, 2015. https://www.facebook.com/ChicagoManual/posts/10152906193679151.

Souza, Pete (@petesouza). 2016. “President Obama bids farewell to President Xi of China at the conclusion of the Nuclear Security Summit.” Instagram photo, April 1, 2016. https://www.instagram.com/p/BDrmfXTtNCt/.

(Chicago Manual of Style 2015)

(Souza 2016)

(Michele Truty, April 17, 2015, 1:09 p.m., comment on Chicago Manual of Style 2015)

Personal communication

Personal communications, including email and text messages and direct messages sent through social media, are usually cited in the text only; they are rarely included in a reference list.

(Sam Gomez, Facebook message to author, August 1, 2017)

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• Writing Tips

How to Cite a Thesis or Dissertation in Chicago Author–Date Referencing

• 2-minute read
• 17th May 2020

Want to reference someone else’s thesis or dissertation in your own work ? This can be useful if you are working on an unusual topic where little research has been published or when you know someone who wrote their final master’s or PhD piece on the same topic you are studying.

As with any source, though, you’ll need to cite it properly. Check out our guide to find out how this works in Chicago author–date referencing.

How to Format In-text Citations

In author–date Chicago referencing , you cite a thesis or dissertation by giving the author’s surname and the date of completion in brackets. For instance, we could cite a source by “Carter” from 2001 like this:

Citing your sources is very important (Carter 2001).

If you’re quoting a thesis or dissertation, meanwhile, you should include the page number in your citation:

Place quotes “within quote marks” (Carter 2001, 65).

You will then give the full source information in your reference list.

Reference List Entry for a Thesis or Dissertation

In the reference list at the end of your paper, the basic format for a thesis or dissertation is:

Author Surname, First Name. Year of completion. “Title.” Type of paper, academic institution, year of completion. URL/database ID (if applicable).

Find this useful?

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For instance, the entry for a master’s dissertation would look like this:

Carter, Susan. 2001. “Citing Sources.” Master’s diss., University of Learning.

For an online version of a document, make sure to add the URL, too:

Johnson, Luke. 2012. “The Joy of Writing.” PhD diss., University of Learning. http://www.uol.ac.uk/archive/phd/johnson-10122017-final.pdf.

If you’ve only referred to an abstract rather than a full dissertation or thesis, meanwhile, you can simply add this detail after the title:

Carter, Susan. 2001. “Citing Sources.” Abstract. Master’s diss., University of Learning.

Want to have your referencing, or any other aspect of your writing, checked? Check out how our team of proofreading experts can help!

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Chicago/Turabian/SBL Style Guide (Notes-Bibliography)

• Format for Paper
• Citation Placement
• Reference (encyclopedias, dictionaries, or lexicons)
• Books / eBooks

Citing a Thesis or Dissertation

• Format for A Thesis or Dissertation
• Government Documents
• Other Resources
• Format of the Reference Page
• Grad Ministry
• Contact the Library
• Theses and dissertations are cited much like books except for the title in enclosed in quotation marks.
• After the author and tile, list the kind of paper (degree level and thesis or dissertation), the academic institution, and the date. This replaces the normal publication data (publisher name, place, and date of publication).
• Abbreviate dissertation as diss.

Bibliography:

Author's Last Name, Author's First Name. "Title of the Work: Subtitle of the Work." Degree Level Kind of Paper., University Name, Year of Degree.

1. Author's First and Last Names, "Title of Work: Subtitle of the Work" (Degree Level Kind of Paper, University Name, Year of Degree), page number.

Navarro-Garcia, Guadalupe. "Integrating Social Justice Values in Educational Leadership: A Study of African American and black University Presidents." PhD diss., University of California, Los Angeles, 2016.

1. Guadalupe Navarro-Garcia, "Integrating Social Justice Values in Educational Leadership: A Study of African American and black University Presidents" (PhD diss, University of California, Los Angeles, 2016).

• << Previous: Theses and Dissertations
• Next: Format for A Thesis or Dissertation >>
• Last Updated: Oct 18, 2023 11:09 AM
• URL: https://libguides.hiu.edu/chicago

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

General Format

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Since The Chicago Manual of Style (CMOS) is primarily intended as a style guide for published works rather than class papers, these guidelines will be supplemented with information from, Kate L. Turabian’s Manual for Writers of Research Papers, Theses, and Dissertations (8th ed.), which is largely based on CMOS with some slight alterations.

To see a side-by-side comparison of the three most widely used citation styles, including a chart of all CMOS citation guidelines, see the Citation Style Chart.

Please use the example at the bottom of this page to cite the Purdue OWL in CMOS.

A Note on Citations

Unlike many citation styles, CMOS gives writers two different methods for documenting sources: the Author-Date System and the Notes-Bibliography (NB) System.  As its name suggests, Author-Date uses parenthetical citations in the text to reference the source's author's last name and the year of publication. Each parenthetical citation corresponds to an entry on a References page that concludes the document. In these regards, Author-Date is very similar to, for instance, APA style.

By contrast, NB uses numbered footnotes in the text to direct the reader to a shortened citation at the bottom of the page. This corresponds to a fuller citation on a Bibliography page that concludes the document. Though the general principles of citation are the same here, the citations themselves are formatted differently from the way they appear in Author-Date.

If you are using CMOS for school or work, don't forget to ensure that you're using your organization's preferred citation method. For examples of these two different styles in action, see our CMOS sample papers:

Author-Date Sample Paper

NB Sample Paper

General CMOS Guidelines

• Text should be consistently double-spaced, except for block quotations, notes, bibliography entries, table titles, and figure captions.
• A prose quotation of five or more lines, or more than 100 words, should be blocked.
• CMOS recommends blocking two or more lines of poetry.
• A blocked quotation does not get enclosed in quotation marks.
• A blocked quotation must always begin a new line.
• Blocked quotations should be indented with the word processor’s indention tool.
• Page numbers begin in the header of the first page of text with Arabic number 1.
• For CMOS and Turabian’s recommendations, see “Headings,” below.

Supplemental Turabian Style Guidelines

• Margins should be set at no less than 1”.
• Typeface should be something readable, such as Times New Roman or Courier.
• Font size should be no less than 10 pt. (preferably, 12 pt.).

Major Paper Sections

• The title should be centered a third of the way down the page.
• Your name, class information, and the date should follow several lines later.
• For subtitles, end the title line with a colon and place the subtitle on the line below the title.
• Double-space each line of the title page.

CMOS Title Page

• Different practices apply for theses and dissertations (see Kate L. Turabian’s A Manual for Writers of Research Papers, Theses, ad Dissertations [8 th ed.].
• Titles mentioned in the text, notes, or bibliography are capitalized “headline-style,” meaning first words of titles and subtitles and any important words thereafter should be capitalized.
• Book and periodical titles (titles of larger works) should be italicized.
• Article and chapter titles (titles of shorter works) should be enclosed in double quotation marks.
• The titles of most poems should be enclosed in double quotation marks, but the titles of very long poems should be italicized.
• Titles of plays should be italicized.
• For example, use lowercase terms to describe periods, except in the case of proper nouns (e.g., “the colonial period,” vs. “the Victorian era”).
• A prose quotation of five or more lines should be “blocked.” The block quotation should match the surrounding text, and it takes no quotation marks. To offset the block quote from surrounding text, indent the entire quotation using the word processor’s indentation tool. It is also possible to offset the block quotation by using a different or smaller font than the surrounding text.
• Label the first page of your back matter, your comprehensive list of sources, “Bibliography” (for Notes and Bibliography style) or “References” (for Author-Date style).
• Leave two blank lines between “Bibliography” or “References” and your first entry.
• Leave one blank line between remaining entries.
• List entries in letter-by-letter alphabetical order according to the first word in each entry, be that the author's name or the title of the piece..
• For two to three authors, write out all names.
• For four to ten authors, write out all names in the bibliography but only the first author’s name plus “et al.” in notes and parenthetical citations.
• When a source has no identifiable author, cite it by its title, both on the references page and in shortened form (up to four keywords from that title) in parenthetical citations throughout the text.
• Write out publishers’ names in full.
• Do not use access dates unless publication dates are unavailable.
• If you cannot ascertain the publication date of a printed work, use the abbreviation “n.d.”
• Provide DOIs instead of URLs whenever possible.
• If no DOI is available, provide a URL.
• If you cannot name a specific page number when called for, you have other options: section (sec.), equation (eq.), volume (vol.), or note (n.).

CMOS Bibliography Page

• Note numbers should begin with “1” and follow consecutively throughout a given paper.
• Note numbers are superscripted.
• Note numbers should be placed at the end of the clause or sentence to which they refer and should be placed after all punctuation, except for the dash.
• Note numbers are full-sized, not raised, and followed by a period (superscripting note numbers in the notes themselves is also acceptable).
• In parenthetical citation, separate documentation from brief commentary with a semicolon.
• Do not repeat the hundreds digit in a page range if it does not change from the beginning to the end of the range.

For more information on footnotes, please see CMOS NB Sample Paper .

While  The Chicago Manual of Style does not include a prescribed system for formatting headings and subheads, it makes several recommendations.

• Maintain consistency and parallel structure in headings and subheads.
• Use headline-style for purposes of capitalization.
• Subheadings should begin on a new line.
• Subheadings can be distinguished by font-size.
• Ensure that each level of hierarchy is clear and consistent.
• Levels of subheads can be differentiated by type style, use of boldface or italics, and placement on the page, usually either centered or flush left.
• Use no more than three levels of hierarchy.
• Avoid ending subheadings with periods.

Turabian has an optional system of five heading levels.

Turabian Subheading Plan

Here is an example of the five-level heading system:

CMOS Headings

Tables and Figures

• Position tables and figures as soon as possible after they are first referenced. If necessary, present them after the paragraph in which they are described.
• For figures, include a caption, or short explanation of the figure or illustration, directly after the figure number.
• Cite a source as you would for parenthetical citation, and include full information in an entry on your Bibliography or References page.
• Acknowledge reproduced or adapted sources appropriately (i.e., photo by; data adapted from; map by...).
• If a table includes data not acquired by the author of the text, include an unnumbered footnote. Introduce the note by the word Source(s) followed by a colon, then include the full source information, and end the note with a period.

How to Cite the Purdue OWL in CMOS

On the new OWL site, contributors’ names and the last edited date are no longer listed at the top of every page. This means that most citations will now begin with the title of the resource, rather than the contributors' names.

Footnote or Endnote (N):

Corresponding Bibliographical Entry (B):

“Title of Resource.” List the OWL as Publishing Organization/Web Site Name . http://Web address for OWL resource.

“General Format.” The Purdue OWL. https://owl.english.purdue.edu/owl/resource/717/02/.

Author Date In-text Citation:

("General Format" 2017).

Author Date References Page Citation:

Year of Publication. “Title of Resource.” List the OWL as Publishing Organization/Web Site Name . http://Web address for OWL resource.

2017. “General Format.” The Purdue OWL . https://owl.english.purdue.edu/owl/resource/717/02.

Fast and free citation generator APA 6th and 7th ed. • MLA 8th ed. • Chicago 16th ed.

• Create Title Page
• Style Guide
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Mindfullness & COVID-19

• General Format Rules
• General Rules – Bibliography
• Encyclopedia & Dictionary
• Government Publication
• Social media
• Dissertation/Thesis
• Online Video
• Audio/Podcast
• Lecture/Speech

Chicago Style Guide

Thesis/dissertation – chicago bibliography, general tips.

• Titles of unpublished works appear in quotation marks—not in italics. This treatment is applied to theses and dissertations.

Thesis/Dissertation Print

Last , First M . " Thesis/Dissertation Title ." PhD diss., [OR] Master's thesis , Academic institution , Year .

1. Mihwa Choi, "Contesting Imaginaires in Death Rituals during the Northern Song Dynasty," (PhD diss., University of Chicago, 2008).

2. Choi "Contesting Imaginaires".

Choi, Mihwa. "Contesting Imaginaires in Death Rituals during the Northern Song Dynasty." PhD diss., University of Chicago, 2008.

Thesis/Dissertation Commercial Database

For items retrieved from a commercial database, add the name of the database and an accession number following the facts of publication. This dissertation cited below is shown as it would be cited if it were retrieved from ProQuest's database for dissertations and theses.

Last , First M . " Thesis/Dissertation Title ." PhD diss., [OR] Master's thesis , Academic institution , Year . Database name ( accession number ).

Choi, Mihwa. "Contesting Imaginaires in Death Rituals during the Northern Song Dynasty." PhD diss.,, University of Chicago, 2008. ProQuest (AAT 3300426).

Thesis/Dissertation Web

Last , First M . " Thesis/Dissertation Title ." PhD diss., [OR] Master's thesis , Academic institution , Year . http:// www.url.com

Johnson, Shakela Carion. "An Examination of the Social Characteristics and Beliefs of Delinquent and Non-Delinquent Youth." PhD thesis. Auburn University, 2007. http://search.proquest.com/docview/304897390?accountid=12528

1. Mihwa Choi, "Contesting Imaginaires in Death Rituals during the Northern Song Dynasty," (PhD diss., University of Chicago, 2008), ProQuest (AAT 3300426).

Choi, Mihwa. "Contesting Imaginaires in Death Rituals during the Northern Song Dynasty." PhD diss., University of Chicago, 2008. ProQuest (AAT 3300426).

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A Chicago teen entered college at 10. At 17, she earned a doctorate from Arizona State

Dorothy Jean Tillman II participates in Arizona State University’s commencement, May 6, 2024, in Tempe, Ariz. Tillman, 18, earned her doctoral degree in integrated behavioral health in December at age 17 from the school. Tillman, of Chicago, began taking college courses at age 10. She earned her associate’s, bachelor’s and master’s degrees before she turned 17. (Tillman Family via AP)

• Copy Link copied

CHICAGO (AP) — Dorothy Jean Tillman II’s participation in Arizona State University’s May 6 commencement was the latest step on a higher-education journey the Chicago teen started when she took her first college course at age 10.

In between came associate’s, bachelor’s and master’s degrees.

When Tillman successfully defended her dissertation in December, she became the youngest person — at age 17 — to earn a doctoral degree in integrated behavioral health at Arizona State, associate professor Leslie Manson told ABC’s “Good Morning America” for a story Monday.

“It’s a wonderful celebration, and we hope ... that Dorothy Jean inspires more students,” Manson said. “But this is still something so rare and unique.”

Tillman, called “Dorothy Jeanius” by family and friends, is the granddaughter of former Chicago Alderwoman Dorothy Tillman.

When most students are just learning to navigate middle school, her mother enrolled Tillman in classes through the College of Lake County in northern Illinois, where she majored in psychology and completed her associate’s degree in 2016, according to her biography.

Tillman earned a bachelor’s in humanities from New York’s Excelsior College in 2018. About two years later, she earned her master’s of science from Unity College in Maine before being accepted in 2021 into Arizona State’s Behavioral Health Management Program.

Most of her classwork was done remotely and online. Tillman did attend her Arizona State commencement in person and addressed the graduating class during the ceremony.

Tillman told The Associated Press on Tuesday that she credits her grandmother and trusting in her mother’s guidance for her educational pursuits and successes.

“Everything that we were doing didn’t seem abnormal to me or out of the ordinary until it started getting all of the attention,” said Tillman, now 18.

There have been sacrifices, though.

“I didn’t have the everyday school things like homecoming dances or spirit weeks or just school pictures and things like that ... that kind of create unity with my peers,” she said.

She has found time to dance and do choreography. Tillman also is founder and chief executive of the Dorothyjeanius STEAM Leadership Institute. The program includes summer camps designed to help young people in the arts and STEM subjects.

She said her plans include public speaking engagements and fundraising for the camp, which Tillman said she hopes to franchise one day.

Tillman is motivated and has innovative ideas, said Manson, adding, “And truly, I think what is inspiring is that she embodies that meaning of being a true leader.”

Jimalita Tillman said she is most impressed with her daughter’s ability to show herself and her successes with grace, but to also understand when to “put her foot down” when choosing between social outings and her education.

Associated Press researcher Jennifer Farrar in New York contributed to this report.

Chicago teen who started college at 10 earns doctorate degree at 17

Dorothy Jean Tillman II’s participation in Arizona State University’s May 6 commencement was the latest step on a higher-education journey the Chicago teen started when she took her first college course at age 10.

In between came associate’s, bachelor’s and master’s degrees.

When Tillman successfully defended her dissertation in December, she became the youngest person — at age 17 — to earn a doctoral degree in integrated behavioral health at Arizona State,  associate professor Leslie Manson told ABC’s “Good Morning America”  for a story Monday.

“It’s a wonderful celebration, and we hope ... that Dorothy Jean inspires more students,” Manson said. “But this is still something so rare and unique.”

Tillman, called “Dorothy Jeanius” by family and friends, is the granddaughter of former Chicago Alderwoman Dorothy Tillman.

When most students are just learning to navigate middle school, her mother enrolled Tillman in classes through the College of Lake County in northern Illinois, where she majored in psychology and completed her associate’s degree in 2016, according to her biography.

Tillman earned a bachelor’s in humanities from New York’s Excelsior College in 2018. About two years later, she earned her master’s of science from Unity College in Maine before being accepted in 2021 into Arizona State’s Behavioral Health Management Program.

Most of her classwork was done remotely and online. Tillman did attend her  Arizona State commencement  in person and addressed the graduating class during the ceremony.

Tillman told The Associated Press on Tuesday that she credits her grandmother and trusting in her mother’s guidance for her educational pursuits and successes.

“Everything that we were doing didn’t seem abnormal to me or out of the ordinary until it started getting all of the attention,” said Tillman, now 18.

There have been sacrifices, though.

“I didn’t have the everyday school things like homecoming dances or spirit weeks or just school pictures and things like that ... that kind of create unity with my peers,” she said.

She has found time to dance and do choreography. Tillman also is founder and chief executive of the Dorothyjeanius STEAM Leadership Institute. The program includes summer camps designed to help young people in the arts and STEM subjects.

She said her plans include public speaking engagements and fundraising for the camp, which Tillman said she hopes to franchise one day.

Tillman is motivated and has innovative ideas, said Manson, adding, “And truly, I think what is inspiring is that she embodies that meaning of being a true leader.”

Jimalita Tillman said she is most impressed with her daughter’s ability to show herself and her successes with grace, but to also understand when to “put her foot down” when choosing between social outings and her education.

For more from NBC BLK, sign up for our weekly newsletter .

The Associated Press

Teen walks at graduation after completing doctoral degree at 17

A teenager from Chicago walked in her graduation ceremony this month after earning her doctoral degree at 17.

Dorothy Jean Tillman II told " Good Morning America " that she was homeschooled in her early years before entering college at age 10.

The video in the player above is from a previous report.

In 2020, she said she earned a Master of Science degree, and then, one year later, at age 15, was accepted into the Doctorate of Behavioral Health Management program at Arizona State University.

In December 2023, at 17, Tillman successfully defended her dissertation to earn her doctoral degree in integrated behavioral health from ASU's College of Health Solutions.

On May 6, she walked at ASU's spring commencement ceremony.

Tillman told "GMA" she has always held education in such high regard in part due to her family's background.

"People in my life like my grandmother, who was part of the Civil Rights movement, she of course harped on the importance of education and consistently learning something always," Tillman said. "But the way I always held education so high on my own, aside from being raised that way, was finding different things to be educated about."

She continued, "I feel like that urge to learn something new just never didn't exist for me."

Dr. Lesley Manson, a clinical associate professor at ASU, told "GMA" that Tillman is the youngest person in school history to earn a doctoral degree in integrated behavioral health.

Manson said she oversaw Tillman's dissertation for the doctoral program offered through ASU Online.

During her studies, Tillman wrote a journal article of her dissertation and completed an internship at a university student health center, according to Manson.

"She really led change and worked on different forms of management to really reduce healthcare stigma and improve that student population there to be able to enter and accept student health services," she said of Tillman. "It was wonderful to see her and help her navigate some of those personal and professional interactions and grow through those experiences."

Manson described Tillman as an "inquisitive" and "innovative" student, and emphasized just how rare it is to accomplish what she has so far.

"It's a wonderful celebration ... but this is still something so rare and unique," she said. "She has innovative ideas and motivation, which is wonderful, and truly, I think what is inspiring is that she embodies that meaning of being a true leader."

Manson said she hopes Tillman continues to inspire people with her love of learning, saying, "That curiosity is always there, and I think all learners come with that, but it's great to be able to see it in someone so young as well."

Her inspiration and how she gives back to community

Tillman said her own journey wouldn't be possible without the support of her mom, who she said is one of her biggest motivators.

"Seeing my mother consistently work so hard to continuously uphold our family's legacy, and be that person that everyone was able to go to, if they needed anything ... always seeing [ her ] like [ a ] 'wonder woman' definitely made me want to grow up [ into ] an accomplished person," she said.

An advocate for education, Tillman is also the founder and CEO of a leadership institute that emphasizes the arts and STEM.

"I feel like adding art and putting a focus on it throughout science, technology, engineering and math makes the kids excited to learn all those things," she said. "And it opens them up to all of the possibilities and all the knowledge provided in that area of just STEM."

As for her plans after graduation, Tillman said she is "just like any other teenager, still figuring out what my specific dreams and goals are."

"I'm really just grateful that the world is my oyster, and that I've done so much so young," she said. "And I have time to kind of think that through."

Tillman added that she hopes young people will take away from her story that it's OK to continually figure out what you want to do in life.

"Always remember that everyone has points in their life where they feel like they're figuring it out," she said. "And so figuring things out, not knowing what you want isn't a bad thing. But making the choice not to sit down and try to figure it out is."

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Chicago teen earns doctorate at 17 years old from Arizona State

Dorothy Jean Tillman II spoke at her commencement this month at Arizona State University. She successfully defended her dissertation to earn a doctorate in integrated behavioral health last December.

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• pedestrian killed

Man hit by car, killed on DuSable Lake Shore Drive near Kenwood: Chicago police

CHICAGO (WLS) -- A man is dead after being hit by a car on the city's South Side early Saturday morning, Chicago police said.

Police said the crash happened after officers responded to a domestic incident in the 3900-block of South Lark Park Avenue just before 12:30 a.m.

ABC7 Chicago is now streaming 24/7. Click here to watch

As officers arrived, a 46-year-old man, who was part of the domestic incident, left the scene, police said. He then tried to cross the 3800-block of South DuSable Lake Shore Drive.

Police said that's when a vehicle, which was traveling northbound on DuSable Lake Shore Drive, hit the man. He suffered trauma to his body and was pronounced dead on the scene.

CPD's Investigative Response Team is investigating.

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• Published: 15 May 2024

Arresting failure propagation in buildings through collapse isolation

• Nirvan Makoond   ORCID: orcid.org/0000-0002-5203-6318 1 ,
• Andri Setiawan   ORCID: orcid.org/0000-0003-2791-6118 1 ,
• Manuel Buitrago   ORCID: orcid.org/0000-0002-5561-5104 1 &
• Jose M. Adam   ORCID: orcid.org/0000-0002-9205-8458 1  

Nature volume  629 ,  pages 592–596 ( 2024 ) Cite this article

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• Civil engineering
• Mechanical engineering

Several catastrophic building collapses 1 , 2 , 3 , 4 , 5 occur because of the propagation of local-initial failures 6 , 7 . Current design methods attempt to completely prevent collapse after initial failures by improving connectivity between building components. These measures ensure that the loads supported by the failed components are redistributed to the rest of the structural system 8 , 9 . However, increased connectivity can contribute to collapsing elements pulling down parts of a building that would otherwise be unaffected 10 . This risk is particularly important when large initial failures occur, as tends to be the case in the most disastrous collapses 6 . Here we present an original design approach to arrest collapse propagation after major initial failures. When a collapse initiates, the approach ensures that specific elements fail before the failure of the most critical components for global stability. The structural system thus separates into different parts and isolates collapse when its propagation would otherwise be inevitable. The effectiveness of the approach is proved through unique experimental tests on a purposely built full-scale building. We also demonstrate that large initial failures would lead to total collapse of the test building if increased connectivity was implemented as recommended by present guidelines. Our proposed approach enables incorporating a last line of defence for more resilient buildings.

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Disasters recorded from 2000 to 2019 are estimated to have caused economic losses of US$2.97 trillion and claimed approximately 1.23 million lives 11 . Most of these losses can be attributed to building collapses 12 , which are often characterized by the propagation of local-initial failures 13 that can arise because of extreme or abnormal events such as earthquakes 13 , 14 , 15 , 16 , floods 17 , 18 , 19 , 20 , storms 21 , 22 , landslides 23 , 24 , explosions 25 , vehicle impacts 26 and even construction or design errors 6 , 26 . As the world faces increasing trends in the frequency and intensity of extreme events 27 , 28 , it is arguably now more important than ever to design robust structures that are insensitive to initial damage 13 , 29 , irrespective of the underlying threat causing it.

Most robustness design approaches used at present 8 , 9 , 30 , 31 aim to completely prevent collapse initiation after a local failure by providing extensive connectivity within a structural system. Although these measures can ensure that the load supported by a failed component is redistributed to the rest of the structure, they are neither viable nor sustainable when considering larger initial failures 13 , 25 , 32 . In these situations, the implementation of these approaches can even result in collapsing parts of the building pulling down the rest of the structure 10 . The fact that several major collapses have occurred because of large initial failures 6 raises serious concerns about the inadequacy of the current robustness measures.

Traditionally, research in this area has focused on preventing collapse initiation after initial failures rather than on preventing collapse propagation. This trend dates back to the first impactful studies in the field of structural robustness, which were performed after a lack of connectivity enabled the progressive collapse of part of the Ronan Point tower in 1968 (ref.  33 ). Although completely preventing any collapse is certainly preferable to limiting the extent of a collapse, the occurrence of unforeseeable incidents is inevitable 34 and major building collapses keep occurring 1 , 2 , 3 .

Here we present an original approach for designing buildings to isolate the collapse triggered by a large initial failure. The approach, which is based on controlling the hierarchy of failures in a structural system, is inspired by how lizards shed their tails to escape predators 35 . The proposed hierarchy-based collapse isolation design ensures sufficient connectivity for operational conditions and after local-initial failures for which collapse initiation can be completely prevented through load redistribution. These local-initial failures can even be greater than those considered by building codes. Simultaneously, the structural system is also designed to separate into different parts and isolate a collapse when its propagation would otherwise be inevitable. As in the case of lizard tail autotomy 35 , this is achieved by promoting controlled fracture along predefined segment borders to limit failure propagation. In this work, hierarchy-based collapse isolation is applied to framed building structures. Developing this approach required a precise characterization of the collapse propagation mechanisms that need to be controlled. This was achieved using computational simulations that were validated through a specifically designed partial collapse test of a full-scale building. The obtained results demonstrate the viability of incorporating hierarchy-based collapse isolation in building design.

Hierarchy-based collapse isolation

Hierarchy-based collapse isolation design makes an important distinction between two types of initial failures. The first, referred to as small initial failures, includes all failures for which it is feasible to completely prevent the initiation of collapse by redistributing loads to the remaining structural system. The second type of initial failure, referred to as large initial failures, includes more severe failures that inevitably trigger at least a partial collapse.

The proposed design approach aims to (1) arrest unimpeded collapse propagation caused by large initial failures and (2) ensure the ability of a building to develop alternative load paths (ALPs) to prevent collapse initiation after small initial failures. This is achieved by prioritizing a specific hierarchy of failures among the components on the boundary of a moving collapse front.

Buildings are complex three-dimensional structural systems consisting of different components with very specific functions for transferring loads to the ground. Among these, vertical load-bearing components such as columns are the most important for ensuring global structural stability and integrity. Therefore, hierarchy-based collapse isolation design prevents the successive failure of columns, which would otherwise lead to catastrophic collapse. Although the exact magnitude of dynamic forces transmitted to columns during a collapse process is difficult to predict, these forces are eventually limited by the connections between columns and floor systems. In the proposed approach, partial-strength connections are designed to limit the magnitude of transmitted forces to values that are lower than the capacity of columns to resist unbalanced forces (see section ‘ Building design ’). This requirement guarantees a specific hierarchy of failures during collapse, whereby connection failures always occur before column failures. As a result, the collapse following a large initial failure is always restricted to components immediately adjacent to those directly involved in the initial failure. However, it is still necessary to ensure a lower bound on connection strengths to activate ALPs after small initial failures. Therefore, cost-effective implementation of hierarchy-based collapse isolation design requires finding an optimal balance between reducing the strength of connections and increasing the capacity of columns.

To test and verify the application of our proposed approach, we designed a real 15 m × 12 m precast reinforced concrete building with two 2.6-m-high floors. This basic geometry represents a building size that can be built and tested at full-scale while still being representative of current practices in the construction sector. The structural type was selected because of the increasing use of prefabricated construction for erecting high-occupancy buildings such as hospitals and malls because of several advantages in terms of quality, efficiency and sustainability 36 .

The collapse behaviour of possible design options (Extended Data Fig. 1 ) subjected to both small and large initial failures was investigated using high-fidelity collapse simulations (Fig. 1 ) based on the applied element method (AEM; see section ‘ Modelling strategy ’). The ability of these simulations to accurately represent collapse phenomena for the type of building being studied was later validated by comparing its predictions to the structural response observed during a purposely designed collapse test of a full-scale building (Extended Data Fig. 2 and Supplementary Video  7 ).

a , Partial-strength beam–column connection optimized for hierarchy-based collapse isolation. b , Partial collapse of a building designed for hierarchy-based collapse isolation (design H) after the loss of a corner column and two penultimate-edge columns. c , Total collapse of conventional building design (design C) after the same large initial failure scenario.

Following the preliminary design of a structure to resist loads suitable for office buildings, two building design options considering different robustness criteria were further investigated (see section ‘ Building design ’). The first option, design H (hierarchy-based), uses optimized partial-strength connections and enhanced columns (Fig. 1a ) to fulfil the requirements of hierarchy-based collapse isolation design. The second option, design C (conventional), is strictly based on code requirements and provides a benchmark comparison for evaluating the effectiveness of the proposed approach. It uses full-strength connections to improve robustness as recommended in current guidelines 37 and building codes 8 , 9 .

Simulations predicted that both design H and design C could develop stable ALPs that are able to completely prevent the initiation of collapse after small initial failure scenarios that are more severe than those considered in building codes 8 , 9 (Extended Data Fig. 3 ).

When subjected to a larger initial failure, simulations predict that design H can isolate the collapse to only the region directly affected by the initial failure (Fig. 1b ). By contrast, design C, with increased connectivity, causes collapsing elements to pull down the rest of the structure, leading to total collapse (Fig. 1c ). These two distinct outcomes demonstrate that the prevention of unimpeded collapse propagation can only be ensured when hierarchy-based collapse isolation is implemented (Extended Data Fig. 4 and Supplementary Video  1 ).

Testing a full-scale precast building

To confirm the expected performance improvement that can be achieved with the hierarchy-based collapse isolation design, a full-scale building specimen corresponding to design H was purposely built and subjected to two phases of testing as part of this work (Fig. 2a and Supplementary Information  Sections 1 and 2 ). The precast structure was constructed with continuous columns cast together with corbels (Supplementary Video  4 ). The columns were cast with prepared dowel bars and sleeves for placing continuous top beam reinforcement bars through columns (Fig. 2b,c ). The bars used for these two types of reinforcing element (Fig. 1a ) were specifically selected to produce partial-strength connections. These connections are strong enough for the development of ALPs after small initial failures but weak enough to enable hierarchy-based collapse isolation after large initial failures.

a , Full-scale precast concrete structure and columns removed in different testing phases. The label used for each column is shown. The location of beams connecting the different columns is indicated by the dotted lines above the second-floor level. The expected collapse area in the second phase of testing is indicated. b , Typical first-floor connection before placement of beams during construction. c , Typical second-floor connection after placement of precast beams during construction. Both b and c show columns with two straight precast beams on either side (C2, C3, C6, C7, C10 and C11). d , Device used for quasi-static removal of two columns in the first phase of testing. e , Three-hinged mechanism used for dynamic removal of corner column in the second phase of testing.

After investigating different column-removal scenarios from different regions of the test building (see section ‘ Experiment and monitoring design ’, Extended Data Fig. 5 and Supplementary Video  2 ), two phases of testing were defined to capture relevant collapse-related phenomena and validate the effectiveness of hierarchy-based collapse isolation. Separating the test into two phases allowed two different aspects to be analysed: (1) the prevention of collapse initiation after small initial failures and (2) the isolation of collapse after large initial failures.

Phase 1 involved the quasi-static removal of two penultimate-edge columns using specifically designed removable supports (Fig. 2d and Extended Data Fig. 6 ). This testing phase corresponds to a small initial failure scenario for which design H was able to develop ALPs to prevent collapse initiation. Phase 2 reproduced a large initial failure through the dynamic removal of the corner column found between the two previously removed columns using a three-hinged collapsible column (Fig. 2e ).

During both testing phases, a distributed load (11.8 kN m −2 ) corresponding to almost twice the magnitude specified in Eurocodes 38 for accidental design situations (6 kN m −2 ) was imposed on bays expected to collapse in phase 2 (Fig. 2a and Supplementary Video  5 ). Predictive simulations indicated that the failure mode and overall collapse would be almost identical when comparing this partial loading configuration with that in which the entire building is loaded (Supplementary Video  3 ). However, the partial loading configuration turns out to be more demanding for the part of the structure expected to remain upright as evidenced by the greater drifts it produces during collapse (see section ‘ Experiment and monitoring design ’ and Extended Data Fig. 7 ). The structural response during all phases of testing was extensively monitored with an array of different sensors (see section ‘ Experiment and monitoring design ’ and Supplementary Information Section 3 ) that provided the information used as a basis for the analyses presented in the following sections.

Preventing collapse initiation

Collapse initiation was completely prevented after the removal of two penultimate-edge columns in phase 1 of testing (Fig. 3a ), demonstrating that design H complies with the robustness requirements included in current building standards 8 , 9 , 39 . As this initial failure scenario is more severe than those considered by standardized design methods 8 , 9 , 30 , it represents an extreme case for which ALPs are still effective. As such, the outcome of phase 1 demonstrates that implementing hierarchy-based collapse isolation design does not impair the ability of this structure to prevent collapse initiation.

a , Test building during phase 1 of testing after removal of columns C8 and C11. The beam depth ( h ) used to compute the ratio plotted in b is shown and the location of the strain measurement plotted in c is indicated. b , Evolution of beam deflection expressed as a ratio of beam depth at the location of removed column C11. The chord rotation of the beams bridging over this removed column is also indicated using a secondary vertical axis. c , Strain increase in continuity reinforcement in the second-floor beam between C12 and C11.

Source Data

Analysis of the structural response during phase 1 (Supplementary Information Section 4 ) shows that collapse was prevented because of the redistribution of loads through the beams (Fig. 3b,c ), columns (Extended Data Fig. 8 ) and slabs (Supplementary Report 4 ) adjacent to the removed columns. The beams bridging over the removed columns sustained loads through flexural action, as evidenced by the magnitude of the vertical displacement recorded at the removal locations (Fig. 3b ). These values were far too small to allow the development of catenary forces, which only begin to appear when displacements exceed the depth of the beam 40 .

The flexural response of the structure after the loss of two penultimate-edge columns was only able to develop because of the specific reinforcement detailing introduced in the design. This was verified by the increase in tensile strains recorded in the continuous beam reinforcement close to the removed column (Fig. 3c ) and in ties placed between the precast hollow-core planks in the floor system close to column C7 (Supplementary Information Section 4 ). The latter also proves that the slabs contributed notably to load redistribution after column removal.

In general, the structure experienced only small movements and suffered very little permanent damage during phase 1 (Supplementary Information Section 4 ), despite the high imposed loads used for testing. The only reinforcement bars showing some signs of yielding were the continuous reinforcement bars of beams close to the removed columns (Fig. 3c ).

Arresting collapse propagation

Following the removal of two penultimate-edge columns in phase 1, the sudden removal of the C12 corner column in phase 2 triggered a collapse that was arrested along the border delineated by columns C3, C7, C6 and C10 (Fig. 4a–d and Supplementary Video  6 ). Thus, the viability of hierarchy-based collapse isolation design is confirmed.

a , Collapse sequence during phase 2 of testing. b , Partial collapse of full-scale test building (design H) after the removal of three columns. The segment border in which collapse propagation was arrested is indicated. The axes shown at column C9 correspond to those used in f to indicate the changing direction of the resultant drift measured at this location. c , Failure of beam–column connections at collapse border. d , Debonding of reinforcement in the floor at collapse border. e , Change in average axial strains measured in column C7. A negative change represents an increase in compressive strains. f , Magnitude of resultant drift measured at C9. g , Change in direction of resultant drift measured at C9. The initial drift after phase 1 of testing and the residual drift after the upright part of the building stabilized are also shown in the plot.

During the initial stages following the removal of C12, the collapsing bays next to this column pulled up the columns on the opposite corner of the building (columns C1, C3 and C6). During this process, column C7 behaves like a pivot point, experiencing a significant increase in compressive forces (Fig. 4e and Supplementary Information Section 5 ). This phenomenon was enabled by the connectivity between collapsing parts and the rest of the structure. If allowed to continue, this could have led to successive column failures and unimpeded collapse propagation. However, during the test, the rupture of continuous reinforcement bars (Fig. 4c ) occurred as the connections failed and halted the transmission of forces to columns. These connection failures occurred before any column failures, as intended by the hierarchy-based collapse isolation design of the structural system. Specifically, this type of connection failure occurred at the junctions with the two columns (C7 and C10) immediately adjacent to the failure origin (around C8, C11 and C12), effectively segmenting the structure along the border shown in Fig. 4b . Segmentation along this border was completed by the total separation of the floor system, which was enabled by the debonding of slab reinforcements at the segment border (Fig. 4d and Supplementary Video  8 ).

Observing the building drift measured at the top of column C9 (Fig. 4f ) enabled us to better understand the nature of forces acting on the building further away from the collapsing region. The initial motion shows the direction of pulling forces generated by the collapsing elements (Fig. 4g ). This drift peaks very shortly after the point in time when separation of the collapsing parts occurs (Fig. 4f ). After this peak, the upright part of the structure recoiled backwards and experienced an attenuated oscillatory motion before finding a new stable equilibrium (Fig. 4g ). The magnitude of the measured peak drift is comparable to the drift limits considered in seismic regions when designing against earthquakes with a 2,500-year return period 41 (Supplementary Information Section 5 ). This indicates that the upright part of the structure was subjected to strong dynamic horizontal forces as it was effectively tugged by the collapsing elements falling to the ground. The building would have failed because of these unbalanced forces had hierarchy-based collapse isolation design not been implemented.

The upright building segment suffered permanent damages as evidenced by the residual drift recorded at the top of column C9 (Fig. 4g ). This is further corroborated by the fact that several reinforcement bars in this part of the structure yielded, particularly in areas close to the segment border (Supplementary Report 5 ). Despite the observed level of damage, safe evacuation and rescue of people from this building segment would still be possible after an extreme event, saving lives that would have been lost had a more conventional robustness design (design C) been used instead.

Discussion and future outlook

Our results demonstrate that the extensive connectivity adopted in conventional robustness design can lead to catastrophic collapse after large initial failures. To address this risk, we have developed and tested a collapse isolation design approach based on controlling the hierarchy of failures occurring during the collapse. Specifically, it is ensured that connection failures occur before column failures, mitigating the risk of collapse propagation throughout the rest of the structural system. The proposed approach has been validated through the partial collapse test of a full-scale precast building, showing that propagating collapses can be arrested at low cost without impairing the ability of the structure to completely prevent collapse initiation after small initial failures.

The reported findings show a last line of defence against major building collapses due to extreme events. This paves the way for the proposed solution to be developed, tested and implemented in different building types with different building elements. This discovery opens opportunities for robustness design that will lead to a new generation of solutions for avoiding catastrophic building collapses.

Building design

Our hierarchy-based collapse isolation approach ensures buildings have sufficient connectivity for operational conditions and small initial failures, yet separate into different parts and isolate a collapse after large initial failures. We chose a precast construction as our main structural system for our case study. A notable particularity of precast systems compared with cast-in-place buildings is that the required construction details can be implemented more precisely. We designed and systematically investigated two precast building designs: designs H and C.

Design H is our building design in which the hierarchy-based collapse isolation approach is applied. Design H was achieved after several preliminary iterations by evaluating various connections and construction details commonly adopted in precast structures. The final design comprises precast columns with corbels connected to a floor system (partially precast beams and hollow-core slabs) through partial-strength beam–column connections (Extended Data Fig. 1 and Supplementary Information Section 1 ). This partial-strength connection was achieved by (1) connecting the bottom part of the beam (precast) to optimally designed dowel bars anchored to the column corbels and (2) passing continuous top beam bars through the columns. With this partial-strength connection, we have more direct control over the magnitude of forces being transferred from the floor system to the columns, which is a key aspect for achieving hierarchy-based collapse isolation. The hierarchy of failures was initially implemented through the beam–column connections (local level) and later verified at the system (global) level.

At the local level, three main components are designed according to the hierarchy-based concept: (1) top continuity bars of the beams; (2) dowel bars connecting beams to corbels; and (3) columns.

Top continuity bars of beams: To allow the structural system to redistribute the loads after small initial failures, top reinforcement bars in all beams were specifically designed to fulfil structural robustness requirements (Extended Data Fig. 3 ). Particularly, we adopted the prescriptive tying rules (referred to as Tie Forces) of UFC 4-023-03 (ref.  9 ) to perform the design of the ties. The required tie strength F i in both the longitudinal and transverse directions for the internal beams is expressed as

For the peripheral beams, the required tie strength F P is expressed as

where  w F  = floor load (in kN m −2 );  D  = dead load (in kN m −2 );  L  = live load (in kN m −2 );  L 1  = greater of the distances between the centres of the columns, frames or walls supporting any two adjacent floor spaces in the direction under consideration (in m);  L P  = 1.0 m; and  W C  = 1.2 times dead load of cladding (neglected in this design).

These required tie strengths are fulfilled with three bars (20 mm diameter) for the peripheral beams and three bars (25 mm diameter) for the internal beams. These required reinforcement dimensions were implemented through the top bars of the beam and installed continuously (lap-spliced, internally, and anchored with couplers at the ends) throughout the building (Extended Data Fig. 1 ).

Dowel bars connecting the beam and corbel of the column: The design of the dowel bars is one of the key aspects in achieving partial-strength connections that fail at a specific threshold to enable segmentation. These dowel bars would control the magnitude of the internal forces between the floor system and column while allowing for some degree of rotational movement. The dowels were designed to resist possible failure modes using expressions proposed in the fib guidelines 37 . Several possible failure modes were checked: splitting of concrete around the dowel bars, shear failure of the dowel bars and forming a plastic hinge in the dowel. The shear capacity of a dowel bar loaded in pure shear can be determined according to the Von Mises yield criterion:

where f yd is the design yield strength of the dowel bar and A s is the cross-sectional area of the dowel bar. In case of concrete splitting failure, the highly concentrated reaction transferred from the dowel bar shall be designed to be safely spread to the surrounding concrete. The strut and tie method is recommended to perform such a design 42 . If shear failure and splitting of concrete do not occur prematurely, the dowel bar will normally yield in bending, indicated by the formation of a plastic hinge. This failure mode is associated with a significant tensile strain at the plastic hinge location of the dowel bar and the crushing of concrete around the compression part of the dowel. The shear resistance achieved at this state for dowel (ribbed) bars across a joint of a certain width (that is, the neoprene bearing) can be expressed as

where α 0 is a coefficient that considers the bearing strength of concrete and can be taken as 1.0 for design purposes, α e is a coefficient that considers the eccentricity, e is the load eccentricity and shall be computed as the half of the joint width (half of the neoprene bearing thickness), Φ and A s are the diameter and the cross-sectional area of the dowel bar, respectively, f cd,max is the design concrete compressive strength at the stronger side, σ sn is the local axial stress of the dowel bar at the interface location, \({f}_{{\rm{yd}},{\rm{red}}}={f}_{{\rm{yd}}}-{\sigma }_{{\rm{sn}}}\) is the design yield strength available for dowel action, f yd is the yield strength of the dowel bar and μ is the coefficient of friction between the concrete and neoprene bearing. By performing the checks on these three possible failure modes, we selected the final (optimum) design with a two dowel bars (20 mm diameter) configuration.

Columns: The proposed hierarchy-based approach requires columns to have adequate capacity to resist the internal forces transmitted by the floor system during a collapse. By fulfilling this strength hierarchy, we can ensure and control that failure happens at the connections first before the columns fail, thus preventing collapse propagation. The columns were initially designed according to the general procedure prescribed by building standards. Then, the resulting capacity was verified using the modified compression field theory (MCFT) 43 to ensure that it was higher than the maximum expected forces transmitted by the connection to the floor system. MCFT was derived to consistently fulfil three main aspects: equilibrium of forces, compatibility and rational stress–strain relationships of cracked concrete expressed as average stresses and strains. The principal compressive stress in the concrete f c 2 is expressed not only as a function of the principal compressive strain ε 2 but also of the co-existing principal tensile strain ε 1 , known as the compression softening effect:

where f c 2max is the peak concrete compressive strength considering the perpendicular tensile strain, \({f}_{c}^{{\prime} }\) is the uniaxial compressive strength, and \({\varepsilon }_{{c}^{{\prime} }}\) is the peak uniaxial concrete compressive strain and can be taken as −0.002. In tension, concrete is assumed to behave linearly until the tensile strength is achieved, followed by a specific decaying function 43 . Regarding aggregate interlock, the shear stress that can be transmitted across cracks v ci is expressed as a function of the crack width w , and the required compressive stress on the crack f ci (ref.  44 ):

where a refers to the maximum aggregate size in mm and the stresses are expressed in MPa. The MCFT analytical model was implemented to solve the sectional and full-member response of beams and columns subjected to axial, bending and shear in Response 2000 software (open access) 45 , 46 . In Response 2000, we input key information, including the geometries of the columns, reinforcement configuration and the material definition for the concrete and the reinforcing bars. Based on this information, we computed the M – V (moment and shear interaction envelope) and M – N (moment and axial interaction envelope) diagrams that represent the capacity of the columns. The results shown in Extended Data Fig. 4 about the verification of the demand and capacity envelopes were obtained using the analytical procedure described here.

At the global level, the initially collapsing regions of the building generate a significant magnitude of dynamic unbalanced forces. The rest of the building system must collectively resist these unbalanced forces to achieve a new equilibrium state. Depending on the design of the structure, this phenomenon can lead to two possible scenarios: (1) major collapse due to failure propagation or (2) partial collapse only of the initially affected regions. The complex interaction between the three-dimensional structural system and its components must be accounted for to evaluate the structural response during collapse accurately. Advanced computational simulations, described in the ‘ Modelling strategy ’ section, were adopted to analyse the global building to verify that major collapse can be prevented. The final design obtained from the local-level analysis (top continuity bars, dowel bars and columns) was used as an input for performing the global computational simulations. Certain large initial failures deemed suitable for evaluating the performance of this building were simulated. In case failure propagation occurs, the original hierarchy-based design must be further adapted. An iterative process is typically required involving several simulations with various building designs to achieve an optimum result that balances the cost and desired collapse performance. The final iteration of design H, which fulfils both the local and global hierarchy checks, is provided in Extended Data Fig. 1 .

Design C is a conventional building design that complies with current robustness standards but does not explicitly fulfil our hierarchy-based approach. The same continuity bars used in design H were used in design C. We adopted a full-strength connection as recommended by the fib guideline 37 . The guideline promotes full connectivity to enhance the development of alternative load paths for preventing collapse initiation. In design C, we used a two dowel bars (32 mm diameter) configuration to ensure full connectivity when the beams are working at their maximum flexural capacity. Another main difference was that the columns in design C were designed according to codes and current practice (optimal solution) without explicitly checking that hierarchy-based collapse isolation criteria are fulfilled. The final design of the columns and connections adopted in design C is provided in Extended Data Fig. 1 .

Modelling strategy

We used the AEM implemented in the Extreme Loading for Structures software to perform all the computational simulations presented in this study 47 (Extended Data Figs. 2 – 5 and 7 and Supplementary Videos  1 , 2 , 3 and 7 ). We chose the AEM for its ability to represent all phases of a structural collapse efficiently and accurately, including element separation (fracture), contact and collision 47 . The method discretizes a continuum into small, finite-size elements (rigid bodies) connected using multiple normal and shear springs distributed across each element face. Each element has six degrees of freedom, three translational and three rotational, at its centre, whereas the behaviour of the springs represents all material constitutive models, contact and collision response. Despite the simplifying assumptions in its formulation 48 , its ability to accurately account for large displacements 49 , cyclic loading 50 , as well as the effects of element separation, contact and collision 51 has been demonstrated through many comparisons with experimental and theoretical results 47 .

Geometric and physical representations

We modelled each of the main structural components of the building separately, including the columns, beams, corbels and hollow-core slabs. We adopted a consistent mesh size with an average (representative) size of 150 mm. Adopting this mesh configuration resulted in a total number of 98,611 elements. We defined a specialized interface with no tensile or shear strength between the precast and cast-in-situ parts to allow for localized deformations that occur at these locations. The behaviour of the interface was mainly governed by a friction coefficient of 0.6, which was defined according to concrete design guidelines 52 , 53 , 54 . The normal stiffness of these interfaces corresponded to the stiffness of the concrete cast-in-situ topping. The elastomeric bearing pads supporting the precast beams on top of the corbels were also modelled with a similar interface having a coefficient of friction of 0.5 (ref.  55 ).

Element type and constitutive models

We adopted an eight-node hexahedron (cube) element with the so-called matrix-springs connecting adjacent cubes to model the concrete parts. We adopted the compression model in refs.  56 , 57 to simulate the behaviour of concrete under compression. Three specific parameters are required to define the response envelope: the initial elastic modulus, the fracture parameter and the compressive plastic strain. For the behaviour in tension, the spring stiffness is assumed to be linear (with the initial elastic modulus) until reaching the cracking point. The shear behaviour is considered to remain linear up to the cracking of the concrete. The interaction between normal compressive and shear stress follows the Mohr–Coulomb failure criterion. After reaching the peak, the shear stress is assumed to drop to a certain residual value affected by the aggregate interlock and friction at the cracked surface. By contrast, under tension, both normal and shear stresses drop to zero after the cracking point. The steel reinforcement bars were simulated as a discrete spring element with three force components: the normal spring takes the principal/normal forces parallel to the rebar, and two other springs represent the reinforcement bar in shear (dowelling). Three distinct stages are considered: elastic, yield plateau and strain hardening. A perfect bond behaviour between the concrete and the reinforcement bars was adopted. We assigned the material properties based on the results of the laboratory tests performed on reinforcement bars and concrete cylinders (Supplementary Information Section 2 ).

Boundary conditions and loading protocol

We assumed that all the ground floor columns are fully restrained in all six degrees of freedom at the base location. This assumption is reasonable, as we expected that the footing would provide sufficient rigidity to constrain any significant deformations. We assigned the reflecting domain boundaries to allow a realistic representation of the collapsing elements (debris) that might fall and rebound after hitting the ground. The ground level was assumed to be at the same elevation at which the column bases are restrained. We applied the additional imposed uniform distributed load as an extra volume of mass assigned to the slabs. To perform the column removal, we used the element removal feature that allows some specific designated elements to be immediately removed at the beginning of the loading stage. This represents a dynamic (sudden) removal, as we expected from the actual test.

Extended Data Tables 1 and 2 summarize all key parameters and assumptions adopted in the modelling process. To validate these assumptions for simulating the precast building designs described previously, it was ensured that the full-scale test performed as part of this work captured all relevant phenomena influencing collapse (large displacements, fracture, contact and collision).

Experiment and monitoring design

We used computational simulations of design H subjected to different initial failure scenarios to define a suitable testing sequence and protocol. The geometry, reinforcement configurations, connection system and construction details of the purpose-built specimen representing design H are provided in Supplementary Information Section 1 and Supplementary Video  4 .

Initial failure scenarios

Initial failure scenarios occurring in edge and corner regions of the building were prioritized for this study because they are usually exposed to a wider range of external threats 58 , 59 , 60 , 61 . After performing a systematic sensitivity study, we identified three critical scenarios (Extended Data Fig. 5 and Supplementary Video  2 ):

Scenario 1: a scenario involving a two-column failure—a corner column and the adjacent edge column. We determined that the required gravity loads to induce collapse equal 11.5 kN m −2 and that partial collapse would occur locally.

Scenario 2: a scenario involving a three-column failure—two corner columns and the edge column in between the two corner columns. We determined that the required gravity loads to induce collapse equal 8.5 kN m −2 and that segmentation (partially collapsing two bays) would take place only across one principal axis of the building.

Scenario 3: a scenario involving a three-column failure: one corner column and two edge columns on both sides of the corner column. We determined that the required gravity loads to induce collapse equal 7.0 kN m −2 and that segmentation (partially collapsing three bays) would take place across both principal axes of the building.

Scenario 3 was ultimately chosen after considering three main aspects: (1) it requires the lowest gravity loads to trigger partial collapse; (2) the failure mode involves activating segmentation mechanisms in two principal axes of the building (more realistic collapse pattern); and (3) the ratio of the area of the intact part and the collapsed part was predicted to be 50:50, leading to the largest collapse area among the three scenarios.

Testing phases

To allow us to investigate the behaviour of the building specimen under small and large initial failures in only one building specimen, we decided to perform two separate testing phases. Phase 1 involved the quasi-static (gradual) removal of two edge columns (C8 and C11), whereas phase 2 involved the sudden removal of the corner column (C12) found between the columns removed in phase 1. A uniformly distributed load of 11.8  kN m −2 was applied only on the bays directly adjacent to these three columns without loading the remaining bays (Supplementary Video  5 ). This was achieved by placing more than 8,000 sandbags in the designated bays on the two floors (the first- and second-floor slabs). We performed additional computational simulations to compare this partial loading configuration and loading of the entire building. The simulations indicated that both would have resulted in almost identical final collapse states (Extended Data Fig. 7 and Supplementary Video  3 ). However, the partial loading configuration introduced a higher magnitude of unbalanced moment to surrounding columns, which induces more demanding bending and shear in columns. Simulations confirmed that the lateral drift of the remaining part of the building would be higher when only three bays are loaded, indicating that its stability would be tested to a greater extent with this loading configuration (Extended Data Fig. 7 ).

Specially designed elements to trigger initial failures

We designed special devices to perform the column removal (Extended Data Fig. 6 ). For phase 1, we constructed two hanging concrete columns (C8 and C11) supported only on a vertical hydraulic jack. The pressure in the jack could be gradually released from a safe distance to remove the vertical reaction supporting the column. In phase 2, a three-steel-hinged column was used as the corner column. The middle part of the column represents a central hinge that was able to rotate if unlocked. During the second testing phase, we unlocked the hinge by pulling the column from outside the building using a forklift to induce a slight destabilization. This resulted in a sudden removal of the corner column C12 and the initiation of the collapse.

Monitoring plan

To monitor the structural behaviour, we heavily instrumented the building specimen with multiple sensors. A total of 57 embedded strain gauges, 17 displacement transducers and 5 accelerometers were placed at key locations in different parts of the structure (Extended Data Fig. 8 and Supplementary Information Section 3 ) during all phases of testing. The data from these sensors (Supplementary Information Sections 4 and 5 ) were complemented by the pictures and videos of the structural response captured by five high-resolution cameras and two drones (Supplementary Videos  6 and 8 ).

Data availability

All experimental data recorded during testing of the full-scale building are available from Zenodo ( https://doi.org/10.5281/zenodo.10698030 ) 62 . Source data are provided with this paper.

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Acknowledgements

This article is part of a project (Endure) that has received funding from the European Research Council (ERC) under the Horizon 2020 research and innovation programme of the European Union (grant agreement no. 101000396). We acknowledge the assistance of the following colleagues from the ICITECH-UPV institute in preparing and executing the full-scale building tests: J. J. Moragues, P. Calderón, D. Tasquer, G. Caredda, D. Cetina, M. L. Gerbaudo, L. Marín, M. Oliver and G. Sempértegui. We are also grateful to the Levantina, Ingeniería y Construcción S.L. (LIC) company for providing human resources and access to their facilities for testing. Finally, we thank A. Elfouly and Applied Science International for their support in performing simulations.

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Nirvan Makoond, Andri Setiawan, Manuel Buitrago & Jose M. Adam

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Contributions

N.M. prepared the main text, performed the computational simulations and validated the test results. A.S. analysed the experimental data, performed data curation and prepared the Methods section. M.B. contributed to the design of the building specimen, the design of the test and data curation. J.M.A. contributed to the design of the research methodology, supervised the research and was responsible for funding acquisition. N.M., A.S. and M.B. contributed to the execution of the experimental test and to preparing figures, extended data and supplementary information. All authors interpreted the test and simulation results and edited the paper.

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Correspondence to Jose M. Adam .

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Extended data figures and tables

Extended data fig. 1 summary of building designs..

General building layout, connection details, and reinforcement configurations of Design H (“Hierarchy-based”) and Design C (“Conventional”).

Extended Data Fig. 2 Comparison of measured experimental data and simulation predictions.

a, Location of shown comparisons. All data shown in panels b to d refer to the change in structural response following the sudden removal of column C12 (after having removed columns C8 and C11 in a previous phase). b, Change in axial load in lower part of column C7. c, Change in axial load in lower part of column C9. d , Change in drift measured in both directions parallel to each building side.

Extended Data Fig. 3 Computational simulations of Design H and Design C subjected to small initial failures.

Principal strains and relative vertical displacement at the location of column C11 after removal of columns C8 and C11 from Design H ( a ) and Design C ( b ).

Extended Data Fig. 4 Demand and capacity envelopes of internal forces in Designs H and C subjected to large initial failures.

Evolution of axial loads, bending moments, and shear forces in column C7 compared to lower and upper bounds of its capacity after the removal of columns C8, C11, and C12 from Design H ( a ) and Design C ( b ).

Extended Data Fig. 5 Initial failure scenarios considered for testing.

Simulation of three different initial failure scenarios that were considered for testing. Scenario 3 was selected for the experimental test.

Extended Data Fig. 6 Specially designed removable supports to perform column removals.

Removable supports designed for quasi-static column removals in phase 1 and sudden column removal in phase 2.

Extended Data Fig. 7 Comparison of simulations of fully loaded and partially loaded building specimen.

a, Loaded bays, deformed shape, and principal normal strains following the sudden removal of column C12 (after having removed columns C8 and C11 in a previous phase). b, Horizontal displacement in the east-west and north-south directions at the top of columns C1 and C9 (2nd floor).

Extended Data Fig. 8 Measured redistribution of column axial forces during phase 1.

Maximum change in axial load of columns during phase 1 of testing based on recorded strain measurements.

Supplementary information

Supplementary information.

This file contains a supplementary test report that covers as-built building design, material properties, monitoring plan, structural response in phase 1 of testing and structural response in phase 2 of testing.

Peer Review File

Supplementary video 1.

Structural response of designs H and C.

Supplementary Video 2

Initial failure scenarios.

Supplementary Video 3

Comparison of partial and full loading.

Supplementary Video 4

Construction of the building.

Supplementary Video 5

An aerial view of the building before the test.

Supplementary Video 6

Multiple perspectives of the partial collapse of the building specimen in testing phase 2.

Supplementary Video 7

Experimental and simulation comparison of the partial collapse in testing phase 2.

Supplementary Video 8

Post-collapse inspection drone video.

Source data

Source data fig. 3, source data fig. 4, source data extended data fig. 2, source data extended data fig. 3, source data extended data fig. 4, rights and permissions.

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Makoond, N., Setiawan, A., Buitrago, M. et al. Arresting failure propagation in buildings through collapse isolation. Nature 629 , 592–596 (2024). https://doi.org/10.1038/s41586-024-07268-5

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Received : 07 December 2023

Accepted : 05 March 2024

Published : 15 May 2024

Issue Date : 16 May 2024

DOI : https://doi.org/10.1038/s41586-024-07268-5

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