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ENR > Buildings > McGraw-Hill Construction | ENR - World Trade Center Investigation "Exonerates" Twin Towers' Design in Sept. 11, 2001 Collapse
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| Structural steel of the twin 110-story towers of the World Trade Center was stripped of its fireproofing by debris from the aircraft impact and weakened by the resulting fires, eventually causing the towers to collapse, according to an interim report by the National Institute of Standards & Technology. The report says the region of dislodged ...
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