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Originally Posted by MedMech
I saw something about this and they said it was welds and bolts that gave way not the actual I-Beams.
The floor was not designed to hold a 757 either.
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From what I have read, you're correct. The connections between the steel floor joists and the inner core and outer load bearing walls gave way. But that still leaves the question of how the core itself could come down. In that scenario, each floor disconnects from the external walls and internal core and pancakes down. But why did the core and outer walls come down?
Here's a link to the early report from MIT: (I'm typing it in, so I hope it works)
http://www.tms.org/pubs/journals/JOM/0112/Eagar/Eagar-0112.html