Quote:
Originally Posted by DaddyHalbucks
Again, the steel was *weakened* because of the heat. Whether it actually melted or not is irrelevant. Have a look at the schematics of the trusses. It makes perfect sense that they would collapse with much of their strength depleted. Ask any competent engineer.
The building was designed to withstand the fact that it was the tallest building in the world. That alone puts enormous stress its components. It was probably not designed to withstand a deliberate military type attack with a fully loaded 757 slamming in at 500 MPH.
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You're right - it's irrelevant whether or not the steel could have melted. Which it couldn't have.
It doesn't make "perfect sense" becuase no matter how weak the trusses were in the immediate orbit of the impacts, they were uncompromised above and below that.
If all the trusses were set to give out at once, then maybe you could have your collapse - if you consider the spindle or core columns would remain, which they didn't. They were shredded to 20-foot lengths like much of the building support.
BYQ the WYC towers were designed according to designers, architects etc... to withstand multiple impacts from commercial airliners - there's a quote somewhere on this very fact.
Flying an airliner into the building is not a military type operation btw...
:D