Global Failure: A Structural Reevaluation of the Collapse of WTC 7 | John Schuler | July 6, 2022

This presentation outlines the findings and conclusions of a four-year study of the collapse of World Trade Center Building 7 by researchers at the University of Alaska Fairbanks (UAF) and provides a comprehensive critique of the WTC 7 report issued by the National Institute of Standards and Technology (NIST) in 2008.

WTC 7 was a 47-story high-rise that suffered a total collapse at 5:20 PM on September 11, 2001, although it was not struck by an airplane.

The objective of the UAF study was threefold: (1) Examine the structural response of WTC 7 to fire loads that may have occurred on September 11, 2001; (2) Rule out scenarios that could not have caused the observed collapse; and (3) Identify types of failures and their locations that may have caused the total collapse to occur as observed. The principal conclusion of the study is that fire did not cause the collapse of WTC 7, contrary to the conclusion of NIST.

The UAF study together with years of analysis by independent engineers since the NIST report was issued in 2008 demonstrates that NIST’s probable collapse sequence for WTC 7 is physically impossible.

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