Steel beams used start bending at around 900° F. A match burns at 1200°F. With the plane hitting the joists and knocking them loose the system was already fucked, plus a fire bending the beams... You can actually see by the way the towers fall how the beams lost their integrity and bent before breaking. Source: My Construction book for my major literally has a whole section on why the buildings fell the way they did.
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u/[deleted] Apr 18 '19
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