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Old 23rd November 2015, 04:09 PM   #52
Penultimate Amazing
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Join Date: Nov 2006
Location: 40 miles north of the border
Posts: 20,843
Originally Posted by Oystein View Post
Floors 5-7 had a structure very different from those above - no tenant space, only structural and some utility infrastructure. Floor 5 had this "diaphragm" moment frame floor.
That's what I thought but didn't have time to check on, thx.

IMO the lowest floors did not fail until heavy debris from the mechanical penthouse fell pretty much unopposed from 40+ storeys higher up.
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