Original upload date: Thu, 29 Jan 2009 00:00:00 GMT
Archive date: Wed, 13 Sep 2023 12:46:15 GMT
A new video - https://youtu.be/bERV6IRbXeM
The National Institute of Standards and Technology (NIST) conducted an extensive three-year scientific and technical investigation of the Sept. 11, 2001, co
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llapse of the 47-story World Trade Center building 7 (WTC 7) in New York City. This video describes the results of this study, which concluded that fires on multiple floors in WTC 7--which were uncontrolled but otherwise similar to fires experienced in other tall buildings--caused an extraordinary event. Heating of floor beams and girders caused a critical support column to fail, initiating a fire-induced progressive collapse that brought the building down.
For more info visit:
https://www.nist.gov/topics/disaster-failure-studies/world-trade-center-disaster-study
http://www.nist.gov/public_affairs/factsheet/wtc_qa_082108.cfm
