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Reply #295: Any evidence for these joist girders? [View All]

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Carefulplease Donating Member (749 posts) Send PM | Profile | Ignore Thu Jul-13-06 05:10 AM
Response to Reply #292
295. Any evidence for these joist girders?
Edited on Thu Jul-13-06 06:01 AM by Carefulplease
Along with lots of laughs, you'll find that it says on page B-53 that floors 41, 42, 43, 75, 76, 77, 107, 108, 109, 110, and the roof of both towers, in addition to the lower floors, were all beam-framed.

Elsewhere in the same section it says floors 44 and 78 were also beam-framed.


No. Those are floors 78 and 79, both elevator floors. Floor 44 is not relevant to the model. They do not mention it anyway. These floors are truss framed in the long span areas and beam framed in the short span areas. How naughty of NIST to hide this fact from the public. (Although they go to great lengths to explain and illustrate all this in their "secret" reports. This is also detailed in the main Structural Models and Performance Analysis report.

http://wtc.nist.gov/pubs/NISTNCSTAR1-2ADraft.pdf


Nowhere does it say that those were the ONLY beam-framed floors.


Nowhere does it say that the core columns aren't filled
with thermite either. So?


It also doesn't say a word about the fact that all the floors required joist girders -- beams -- to support the outstanding legs of the joists in the two-way grids at each of the four corners of the beam- and truss-framed floors. That's at least eight beams per floor that the NIST is, ahem, reluctant to speak about.


The truss framed floors do *not* require beams because all primary trusses run from perimeter beams to core -- except for "the short span truss at the corner of the core (which) was heavier than the typical ones because it did support the long span trusses that framed to it."

This is also detailed in the secret report that I've referenced to you and that you now ask me to read. None of these floors that were beams framed were involved in the fires and structural damage except maybe for floor 78 of WTC2. And NIST modeled this.

I think you are grasping at straws.
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