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View Poll Results: What caused the WTC buildings to fall?
faulty, poor grade construction steel 2 1.69%
jet airliners crashing into the towers 23 19.49%
subsequent fires weakening the structures 14 11.86%
a combination of airliners crashing & the fires 27 22.88%
a bomb or missile attached to the plane(s) 4 3.39%
combination of all of the above 3 2.54%
angry UFO alien death ray beam 16 13.56%
strategically placed demolition charges 29 24.58%
Voters: 118. You may not vote on this poll

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  #921 (permalink)  
Old 08-24-2008, 12:34 PM
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Quote:
Typically steel is heat treated in a multi-step process. First it is heated to create a solid solution of iron and carbon in a process called austenizing. Austenizing is followed by quenching to produce a martensitic microstructure. The steel is then tempered by heating between the ranges of 150°C-260°C (300°F-500°F) and 370°C-650°C (700°F-1200°F). Tempering in the range of 260°C-370°C (500°F-700°F) is sometimes avoided to reduce temper brittling.
Wonder if an uncontrolled fire started by jet fuel could reach a high enough temperature to weaken steel beams?
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  #922 (permalink)  
Old 08-24-2008, 01:01 PM
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This may be an interesting read:

http://www.structuremag.org/archives...on-June-06.pdf
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  #923 (permalink)  
Old 08-24-2008, 11:57 PM
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jet airliners crashing into the towers which caused the steel to weaken.
 
  #924 (permalink)  
Old 08-25-2008, 12:28 AM
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Ladies and Gentlemen We Have A Winner!
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  #925 (permalink)  
Old 08-25-2008, 05:21 AM
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The original poster of this thread committed suicide years ago.

In the mean time the suggestions that Americans killed their own has offended countless members.

Time to lock this one up.
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