Quote:
Originally Posted by photon
Who knows, but you can't argue with physics.
Steel doesn't "fail" at 3000F, it MELTS. At 1100F it looses 50% of its strength, at 1800F 90%.
In order to compromise the strength of steel, you don't have to melt it completely. Look at any of the pictures, you can clearly see bent and twisted steel beams. You can also clearly see in pictures before the towers came down where the floors are being pulled inwards due to sagging of the floors, due to the heat causing the floor supports to sag.
This is all covered extensively in links already provided.
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Your numbers don't apply to all grades of steel.