Democratic Underground - There was plenty of heat to weaken the steel..

Reply #2: There was plenty of heat to weaken the steel.. [View All]

hack89

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Tue Mar-08-05 09:58 PM
Response to Reply #1

2. There was plenty of heat to weaken the steel..

Edited on Tue Mar-08-05 09:59 PM by hack89

Read this excellent report by the Canadian research council on the role of fire resistance in the WTC http://irc.nrc-cnrc.gc.ca/fulltext/nrcc42466/nrcc42466.pdf

According to this web site for forensic fire investigators http://www.tcforensic.com.au/docs/article10.html#1.3

steel loses 50% of its structural strength and sags at 550°C (1022°F) while smoldering combustion in a regular house fire can reach 600°C (1112°F)

This Canadian site http://www.cwc.ca/design/fire/ says
"Steel, for instance, quickly loses its strength when heated and its yield point decreases significantly as it absorbs heat, endangering the stability of the structure (Graph 1). An unprotected, conventional steel joist system will fail in less than 10 minutes under standard laboratory fire exposure test methods"

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Reply #2: There was plenty of heat to weaken the steel.. [View All]