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since when do steel building collapse just because of fire?..
Heat softens the steel beams until they are almost like rubber - elastic rods... Especially with the old 'insulation' forms they used when those buildings were built.
The towers lost structural integrity of the floors where the fuel was burning and caused those columns to buckle fairly quickly due to the massive weight of the floors above. Once those columns started giving it was a chain reaction and one whole floor collapsed.
Once that happened the sheer magnitude of force and weight drove the buildings almost straight down.
If you look at the videos, the one towers top section 10-20(?) floors DID in fact lean and fall off to the side as the rest of that tower came almost straight to the ground.
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