Quote:
Originally Posted by dynastoned
You can't even compare the two incidents.
Not to mention the steel in the WTC had fire proof coating and the ones used to build the bridge would have a mere paint or galvanized finish.
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Good point. I feel the only explanation for the two towers collapsing is intense vibration. Sure they could withstand fire and impact but the vibration of the impact caused support systems to cascade. If you've ever been at the towers you could feel and see them sway in the wind. Very creepy feeling. We would go to the top of the towers and you could hold your flat hand sideways up to any horizontal or vertical line of sight in the distance and see how much the towers would sway.
The steel columns of the towers were immense, just immense. For a fire to melt enough of them to cause a collapse is unrealistic. That fire would have had to have been so hot for so long like days on end.
Something other than the fires caused the towers to collapse and I'm betting the intense vibration of impact coupled with the towers' natural swaying motion was too much stress causing the upper floors to cascade downard. That was enough to cause far more vibration on the second tower. It was like a small earthquake.