Report Says Fire, Not Explosion, Felled 7 W.T.C.
Fires in the 47-story office tower at the edge of the World Trade Center site undermined floor beams and critical structural columns, federal investigators concluded Thursday, as they attempted to curb still-rampant speculation that explosives or fuel fires were responsible for the building’s collapse of Sept. 11, 2001.
The long-delayed report by engineers here at the National Institute of Standards and Technology in suburban Washington is intended to solve one of still lingering central questions about the 2001 attacks: Why did 7 World Trade Center fall, if it was not hit by an airplane.
“Heating of floor beams and girders caused a critical support column to fail,” said Shyam Sunder, the lead investigator. “Video and photographic evidence combined with detailed computer simulations show that neither explosives nor fuel oils played a role in the collapse that brought the building down.”
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The long-delayed report by engineers here at the National Institute of Standards and Technology in suburban Washington is intended to solve one of still lingering central questions about the 2001 attacks: Why did 7 World Trade Center fall, if it was not hit by an airplane.
“Heating of floor beams and girders caused a critical support column to fail,” said Shyam Sunder, the lead investigator. “Video and photographic evidence combined with detailed computer simulations show that neither explosives nor fuel oils played a role in the collapse that brought the building down.”