NIST said the building above the floors 7-14 fell downward as a single unit in the global collapse stage. The visual evidence shows that to be symmetrical.
What more can I say if all you want to do is deny these two facts. I might as well talk to a cat or a dog.
Thanks for demonstrating that you can't properly interpret what NIST really said.
Some lousy architect you are...!
In 4 years, you haven't figured out that what NIST said fell during "Global Collapse" is not "the building".
Allow me to correct your sloppy attempt at a quote:
NIST NCSTAR1-9, vol 2, pg 586 (pdf pg. 248)
"Once column support was lost in the lower floors, the
remaining exterior structure above
began to fall vertically as a single unit."
"Global collapse", in NIST's terms, refers to the collapse of the external walls, an event that they explicitly state happened AFTER initial collapse, then 1.3 seconds of vertical progression of initial collapse and then about 6.9 seconds of horizontal progression. The 2nd & 3rd stages ALSO reaching above the 14th floor.
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Perhaps some of this will help:
Please refer to NCSTAR1-9 Vol 2, pg 599 (pdf pg 261).
They list the observables & compare them to their models.
NIST states explicitly (in Table 12-2) that the collapse begins at -6 seconds, the EP collapses at 0 seconds, and that the START of the collapse of the North wall starts at 6.9 seconds.
The East Penthouse, I think that you'll agree, is "above the 14th floor". As is the roofline of the North wall.
Please explain to me how two parts of the same building can descend "as a single unit, symmetrically" if one part begins to descend almost 7 seconds before another part.
6.9 seconds of "free fall" from a standing start result in a descent of about 766 feet.
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Still claim that NIST said that "THE BUILDING" descended as a single unit"???
The favor of a reply is requested…
(C'mon, mrkinnies. I'm not "a cat or a dog", but an experienced mechanical engineer. Dazzle me with architectural tech talk.)
tk