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Performance-based fire protection of office buildings: A case study based on the collapse of WTC 7

Robert Korol, Frank Greening, Paul Heerema



This article points out the benefits of employing a performance based analysis approach for ascertaining the likelihood that travelling fires in an office building could induce a localized failure that might trigger its collapse. The case study chosen is Building 7 of the World Trade Center complex. Based on the parametric study undertaken, our findings were that the fire-protected steel floor beam, identified as the initiator of the cascade of events that followed, could not have done so, virtually under any circumstance.

Supplementary Sources:

Clip from "9-11 in the Academic Community"


collapse initiation; steel structures; fire loadings; fire protection; thermal analysis; heat release rates

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Feasey R, Buchanan A (2002). Post flashover fires for structural design. Fire Safety Journal, 37, 83-105.

Frankel Steel Limited (1985a). Erection Drawing E12.13, 7 World Trade Center.

Frankel Steel Limited (1985b). Fabrication Shop Drawing, 7 World Trade Center.

Frater G, Kleinfeldt C (2001). Fire protection of steel structures. Advantage Steel, 16-19.

Gray WA, Muller R (1974). Engineering Calculations in Radiative Heat Transfer, Pergamon Press, Oxford.

Jonsdottir AM, Stern-Gottfried J, Rein G (2010). Comparison of resultant steel temperatures using travelling fires and traditional methods: Case study for the informatics forum building. Proceedings of the 12th International Interflam Conference, Nottingham, U.K.

Jowsey A, Scott P (2014). Structural Steel Protection: Engineered Solutions, AkzoNobel International.

NIST (2008a). National Institute of Standards and Technology Final Report on the Collapse of World Trade Center Building 7. NIST-NCSTAR 1A, NIST, Gaithersburg, Md.

NIST (2008b). Status of NIST's Recommendations Following the Federal Building and Fire Investigation of the World Trade Center Disaster.

NIST (2008c). Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7, NCSTAR 1-9, Vol.1, Chap. 8, Section 8.4.1, p 330.

NIST (2012). Changes to the NIST Reports of the Federal Building and Fire Investigation of the World Trade Center Disaster, NCSTAR 1-9.

Oetelaar TA, Johnston CR (2012). Determination of the convective heat transfer coefficient of hot air rising through terracotta flues. CSME Transactions, 36 (4), 413.

Quintierre JG, Williams FA (2014). Comments on the NIST investigation of the world trade center fires. Journal of Fire Sciences, 32, 281-291.

Petterson O, Magnusson S-E, Thor J (1976). Fire Engineering Design of Steel Structures. Swedish Institute of Steel Structures, Publication 50.

Ruddy J, Marlo JP, Ioannides SA, Alfawakhiri F (2002). Fire Resistance of Structural Steel Framing. AISC Steel Design Guide 19, Chicago, Il.

Salvarinas JJ (1986). Seven world trade center, New York, fabrication and construction aspects. Canadian Structural Engineering Conference Proceedings, Canadian Steel Construction Council, Willowdale, Ontario, pp 11-1 to 11-44.