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NIST WTC 7 Investigation Finds Building Fires Caused Collapse
Report and Recommendations for Improving Building Safety Released for Comment
August 21, 2008
GAITHERSBURG, Md.—The fall of the 47-story World Trade Center building 7 (WTC 7) in New York City late in the afternoon of Sept. 11, 2001, was primarily due to fires, the Commerce Department’s National Institute of Standards and Technology (NIST) announced today following an extensive, three-year scientific and technical building and fire safety investigation. This was the first known instance of fire causing the total collapse
Our study found that the fires in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event,” said NIST WTC Lead Investigator Shyam Sunder. “Heating of floor beams and girders caused a critical support column to fail, initiating a fire-induced progressive collapse WTC 7 used a structural system design in widespread use.
To reach the conclusions in its report, NIST complemented its in-house expertise with private-sector technical experts; accumulated an extensive collection of documents, photographs and videos related to the WTC events of 9/11; conducted first-person interviews of WTC 7 occupants and emergency responders; analyzed the evacuation and emergency response operations in and around WTC 7; and performed the most complex computer simulations ever conducted to model a building’s response behavior and determine its collapse sequence due to a combination of debris impact damage, fires and a progression of structural failures from local fire-induced damage to collapse initiation, and, ultimately, to global collapse
http://www.nist.gov/public_affairs/releases/wtc082108.html
Former Chief of NIST's Fire Science Division Calls for Independent Review of World Trade Center Investigation
August 21, 2007
NIST used computer models that they said have never been used in such an application before and are the state of the art. For this they should be commended for their skill. But the validation of these modeling results is in question. Others have computed aspects with different conclusions on the cause mechanism of the collapse. Moreover, it is common in fire investigation to compute a time-line and compare it to known events. NIST has not done that.
Why were not alternative collapse hypotheses investigated and discussed as NIST had stated repeatedly that they would do? ...
Dr. Quintiere also expressed his frustration at NIST’s failure to provide a report on the third skyscraper that collapsed on 9/11, World Trade Center Building 7. “And that building was not hit by anything,” noted Dr. Quintiere. “It’s more important to take a look at that. Maybe there was damage by the debris falling down that played a significant role. But other than that you had fires burning a long time without fire department intervention. And firefighters were in that building. I have yet to see any kind of story about what they saw. What was burning? Were photographs taken? Nothing!”
OpEdNews - Article: Former Chief of NIST's Fire Science Division Calls for Independent Review of World Trade Center Investigation
[ame]http://www.youtube.com/watch?v=65Qg_-89Zr8[/ame]
Report and Recommendations for Improving Building Safety Released for Comment
August 21, 2008
GAITHERSBURG, Md.—The fall of the 47-story World Trade Center building 7 (WTC 7) in New York City late in the afternoon of Sept. 11, 2001, was primarily due to fires, the Commerce Department’s National Institute of Standards and Technology (NIST) announced today following an extensive, three-year scientific and technical building and fire safety investigation. This was the first known instance of fire causing the total collapse
Our study found that the fires in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event,” said NIST WTC Lead Investigator Shyam Sunder. “Heating of floor beams and girders caused a critical support column to fail, initiating a fire-induced progressive collapse WTC 7 used a structural system design in widespread use.
To reach the conclusions in its report, NIST complemented its in-house expertise with private-sector technical experts; accumulated an extensive collection of documents, photographs and videos related to the WTC events of 9/11; conducted first-person interviews of WTC 7 occupants and emergency responders; analyzed the evacuation and emergency response operations in and around WTC 7; and performed the most complex computer simulations ever conducted to model a building’s response behavior and determine its collapse sequence due to a combination of debris impact damage, fires and a progression of structural failures from local fire-induced damage to collapse initiation, and, ultimately, to global collapse
http://www.nist.gov/public_affairs/releases/wtc082108.html
Former Chief of NIST's Fire Science Division Calls for Independent Review of World Trade Center Investigation
August 21, 2007
NIST used computer models that they said have never been used in such an application before and are the state of the art. For this they should be commended for their skill. But the validation of these modeling results is in question. Others have computed aspects with different conclusions on the cause mechanism of the collapse. Moreover, it is common in fire investigation to compute a time-line and compare it to known events. NIST has not done that.
Why were not alternative collapse hypotheses investigated and discussed as NIST had stated repeatedly that they would do? ...
Dr. Quintiere also expressed his frustration at NIST’s failure to provide a report on the third skyscraper that collapsed on 9/11, World Trade Center Building 7. “And that building was not hit by anything,” noted Dr. Quintiere. “It’s more important to take a look at that. Maybe there was damage by the debris falling down that played a significant role. But other than that you had fires burning a long time without fire department intervention. And firefighters were in that building. I have yet to see any kind of story about what they saw. What was burning? Were photographs taken? Nothing!”
OpEdNews - Article: Former Chief of NIST's Fire Science Division Calls for Independent Review of World Trade Center Investigation
[ame]http://www.youtube.com/watch?v=65Qg_-89Zr8[/ame]
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