Quote:
Originally Posted by Dirty F
Thats the problem with simpletons like you. You get your "facts" from clowns just like you.
"All materials weaken with increasing temperature and steel is no exception. Strength loss for steel is generally accepted to begin at about 300ºC and increases rapidly after 400ºC, by 550ºC steel retains about 60% of its room temperature yield strength."
You are a fucking retard. Sorry, i cant say it in a more polite way.
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Thanks for apologizing for your inability to respond in a more civil way.
"The melting point of steel is about 1,500 degrees Celsius (2,800 degrees Fahrenheit). Normal building fires and hydrocarbon (e.g., jet fuel) fires generate temperatures up to about 1,100 degrees Celsius (2,000 degrees Fahrenheit). NIST reported maximum upper layer air temperatures of about 1,000 degrees Celsius (1,800 degrees Fahrenheit) in the WTC towers (for example, see NCSTAR 1, Figure 6-36).
[Therefore not hot enough to melt steel or at the time of exposre recorded to soften it significantly]
However, when bare steel reaches temperatures of 1,000 degrees Celsius
[1,832.00 Farenheity] , it softens and its strength reduces to roughly 10 percent of its room temperature value. Steel that is unprotected (e.g., if the fireproofing is dislodged) can reach the air temperature within the time period that the fires burned within the towers. Thus, yielding and buckling of the steel members (floor trusses, beams, and both core and exterior columns) with missing fireproofing were expected under the fire intensity and duration determined by NIST for the WTC towers. "
What they omit is that, if it were to be "expected" the steel should have been exposed at DOUBLE the temperature for the 3 to 6 hour period required for steel to soften; when, in fact, it was "exposed" for less than an hour, at lower temperatures. So the fire explanation is bullshit.
:D