You obviously have to be quite clueless to believe any kind of office fire and some jet fuel (which was mostly gone right after the initial fireball) can cause heat that is even remotrly sufficient to weaken 1-2 inch thick steel.
There's way, WAAY too much steel for such a weakening to even start being a remote possibility. There's not NEARLY enough heat in those fires, and way too much ongoing dissipation.
Steel framed buildings stood after burning much hotter and much longer, plenty of times.
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clueless even on the basics, not worth my time