Quote:
Originally Posted by rockymtnchief
As far as being built to withstand an aerial strike, I had read that it was built to withstand an AIRCRAFT strike similar to the one that hit the Empire State Building. Nowhere have I seen that it was built to withstand a large passenger jet strike. If someone has seen different, I stand corrected.
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Yes, it was built to withstand an aircraft strike, what it WASN'T built to withstand was the intense heat of the jet fuel burning. The heat weakened the trusses and once one floor collapsed, gravity took over and it was a chain reaction. And the reason the both the collapses were similar was because both buildings were designed the same way and were exposed to the same conditions leading to the same failures.