@Builder,
the issue of how much strength is lost by the alloy steel girders under thermal stress under loading. The studies Ive seen disclosed a varying temperature of the fire (due to jetting) of over 2400 F
. At 1800 F the girders would have lost more thn 85% of their strength a required in the design engineering.
Couple that with the fact that many girders and skin panels were actually hanging free until the deformed under heat and weight. Compressive forces had also induced"selective anatexis" on several layers of metal (Funny thing is, melting was only a surface phenom) and was densest at flex points (kinda like quartz veins in folding rock under pressure.
Heat Pressure and Time, theres yer culprit.
The denial industry has yet to make a reasonable case that disproves anything. Dr Jones has been debunked so often that he is oretty much ignored by the (and I shudder to call them this) "The TRUTHERS"
Theyre a bunch of obsessed idiots who are easily led by opportunistic self adoring clowns.
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PS, fresco brought up the response to "what these guys oughta provide as far as evidence before they start claiming something" It was not up to fresco to provide the data, HE is not make the assertion.