Hulsey presents research arguing WTC7 not brought down by fires/University of Alaska
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23rd November 2015, 04:09 PM
Join Date: Nov 2006
Location: 40 miles north of the border
Originally Posted by
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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