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To: dustcatcher who wrote (41409)	9/12/2001 1:30:57 PM
From: stockman_scott	Respond to of 65232

Some Morgan Stanley folks got out ... jaguars.com

To: dustcatcher who wrote (41409)	9/12/2001 1:41:43 PM
From: DiB	Read Replies (2) \| Respond to of 65232

WTC was built to withstand a hit from Boeing 707. Unfortunately, 757 and 767 are much bigger planes...

To: dustcatcher who wrote (41409)	9/12/2001 2:24:40 PM
From: Morris Catt	Respond to of 65232

Why the World Trade Towers Collapsed: The World Trade Towers were structural steel on concrete foundations. The structural steel supports are normally coated with fire retardant materials. But this fire magnitude and the temperatures generated were far in excess of the design specs. When the planes hit loaded with fuel the impact & explosion started a massive fire raising the steel tempertures to likely in excess of 900 degrees F. This weakened the steel support plus likey some steel supports were sheared in the collision. With some support beams lost and the temperature quickly rising in the remaining beams over several floors the remaining beams quickly lost load carrying capacity. As soon as the the shear or compressive strength dropped below the actual stress load the whole building collapsed from the floors of impact down by all the weight from above. Almost certainly the temperature of the fire was far above and encompassed far more floors than the building was designed to withstand. Any thermal insulation remaining on steel supports after the crash would do little or no good in a sustained fire since the steel supports are not cooled. Mac .

To: dustcatcher who wrote (41409)	9/12/2001 5:49:18 PM
From: Boplicity	Read Replies (2) \| Respond to of 65232

The steel will last around two hours no matter what, then it would melt.