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Once one storey collapsed all floors above would have begun to fall. The huge mass of falling structure would gain momentum, crushing the structurally intact floors below, resulting in catastrophic failure of the entire structure. While the columns at say level 50 were designed to carry the static load of 50 floors above, once one floor collapsed and the floors above started to fall, the dynamic load of 50 storeys above is very much greater, and the columns were almost instantly destroyed as each floor progressively "pancaked" to the ground.
Originally posted by James Fetzer
Even if we leave aside that the fires were too low and too brief to have caused the steel to even weaken . . . .
In 1975, moreover, an enormous fire consumed 65% of the eleventh floor of the North Tower. It burned at around 2,000*F for three hours and enveloped the core.
Originally posted by James Fetzer
I guess, according to this theory, the buildings could not have supported their floors to begin with! I mean, how absurd can you get? They were actually constructed to have the capacity to carry 10 times their expected maximum load (with people crammed shoulder-to-shoulder).
Originally posted by James Fetzer
there was too little kinetic energy for the collapse of one flooor to bring about the collapse of another