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To: Pravda who wrote (51472)	5/18/2006 3:31:10 PM
From: sciAticA errAticA	Respond to of 116555

re: Did you ever study what happens to steel's compressive strength ---------- ... yes... you reference the time required at specific temperatures to weaken structural steel of specific yield strengths (Fy). ... the fires at WTC1&2 were kerosene fires (jet fuel), which consumed themselves rather quickly, and at relatively low temperatures, as evidenced by the black smoke, indicating incomplete combustion. ... as I noted here: Message 22465366 ... the record for the performance of steel structures in fire situations -- fires much hotter and of much longer durations -- is exceptional. Indeed, WTC1&2&7 are the only steel structure buildings ever reportedly collapsed by fire. Ever.