Booms, Busts, and Recoveries Message Board

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Strategies & Market Trends : Booms, Busts, and Recoveries

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To: smolejv@gmx.net who wrote (9220)	9/14/2001 6:06:08 PM
From: David Howe	Read Replies (1) of 74559

I'm a structural engineer and work for a design build contractor. << no heat could mean another 10 minutes, possibly 10 hours >> The buildings would still be standing if it weren't for the fire. The impact had a minimal effect on the structure. Fire weakens the steel. Red Iron actually burns at 1600 degrees. The aircraft fuel was probably burning at around 3500 degrees. It was the fire that took the building down. The steel DID have fireproofing on it as do all buildings built of steel today (if they meet code). This fireproofing is intended to protect the steel for up to an hour or two under normal fire conditions. The hope is that the fire can be put out in time before the fireproofing gives way. This was not a normal fire. 4000 gallons of aircraft fuel per building is not normal. Dave

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