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Metrodome roof collapse video

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Thank you, Scott, for such an interesting tidbit.
 
From outside at least it looks like a classical snap-thru failure.
The designer must have over-estimated the load capacity.
It seems that the structure consists of a metallic mesh with inflatable cells between them.
It is unlikely those cells have much contribution to over-all stability.
I would bet that the circumferential ends of the metallic elements are damaged,
one way or another.
 
Sincerely
 
Gregory from Oz.