vendredi 30 mai 2014

It appears that Bazant was right. No crush-up.

Well, whaddaya know.! The expert was right.



Again.



World Trade Center Tower 1 Litigation Animations

tinyurl.com/mj3gno7



The first few seconds are an overlay of their animation with a video, taken from the same viewpoint. Clever.



Starting at about 3:20, they show just the FEA model.



Significant things to notice:



1. The core collapses first.!



2. The core has dropped 3 to 4 stories before the external walls start to fail.



3. The external wall buckles over about 8 floors span, 93rd to 101st floor



4. After the 8 story buckle, the crush zone shifts to the BOTTOM of that buckle zone, the 93rd floor.



5. There is no crush up from the 93rd floor to the top of the building during the collapse shown. It is all crush down.



Yes, I know that this is an FEA model. But it is a physics-based model & the best model that I've seen of this critical phase. I am very inclined to believe these models.



And the animation - to the extent that one wishes to accept it - shows several interesting phenomenon that were hotly debated topics here. But that previously had no evidence in the videos to support one side or the other.

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There is a second Animation for WTC2 here: tinyurl.com/o5o4rq4



1. Looking at the outrigger girders at the top, it appears that the core fails first here as well.



2. External wall failure follows core & starts on 3 floors of E wall, but very quickly encompasses about 11 floors of S & E walls.



3. Walls buckle inward over about 3 floors from both top & bottom of failed 11 floors.

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Trés cool.





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