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Down? >> the clue it offers is that the engineer should have been given access to check the interior of the building, the slab, which he never had access, for some reason. it showed that deterioration was going on. but he did not check the main towers and check the slab/column connections. this building is a flat slab construction. so punch and shear, where the column punches through the slab, that's a common failure for these types of structures. if he had been given access to check those column connections to the slab, we would have known whether those were badly deteriorated and whether pun...

Check those column connections to the slab, we would have known whether those were badly deteriorated and whether punch and shear was going to be an imminent failure mechanism for this structure because the tower that came down, came down on itself. >> mm-hmm. >> it's almost like a controlled demolition. you know, there are several ways that can happen. the column could have failed. punch and shear could have happened. the foundation could have given way. we also need to check the original design. was this structure well designed? folks might say that the building has been standing for 40 year...

Deck and cracking and crumbling of the columns, beams, walls of the parking garage. professor, when you hear that, does this offer clues as to why this building came down? >> the clue it offers is that the engineers should have been given access to check the interior of the building, the slab to column connections, which he never had that access for some reason. it showed that deterioration was going on, but he did not check the main towers and check the slab/column connections. this building is a flat slab construction. so punch and shear, where the column punches through the slab, that's a c...