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Reply #37


Response to jesters (Reply #36)

Wed Jan 4, 2012, 12:05 PM

37. Too many damaged columns further weakened by fire

the towers were hit by fully loaded 767s at top speed. They had to have inflected significant damage to some core columns. Which meant you have fewer columns supporting the same amount of weight. You then heat those columns until they are weakened - not melted but weakened. The fires were plenty hot and it doesn't take that long before the weight carrying capacity of the columns were degraded.

Once the first column sagged it was all over. All that massive PE was instantly converted to KE and the collapsed began. The lower floors were not designed to withstand such massive dynamic loads.

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