Re: Evidence that 9/11 was an inside job.[W:57]
See, now you’ve bought the statements that the 2 Musketeers over at the free forum have blathered on about for years. Don’t do that. They put out some interesting work about the observables, but imho, became so infatuated with their work that they deluded themselves into thinking it was critical. It’s their own little psychological defense mechanism that means they don’t have to confront the uselessness of it all cuz detailing the collapse progression isn’t very useful.
NIST details in their report how they believe loads shifted as a result of the plane strikes. Now, one can see plainly what failed on the exterior. Reasonable assumptions can be made what happened inside too - but note this is out of view, so Is it accounted for?
Additionally, thermal creep unloaded and loaded various columns over time, but isn’t observable at all from some lo res video. And I haven’t seen a challenge to this from anyone, yet alternate ‘explanations ‘ about collapse initiation fail at the starting line.
So really, the UNobservables just might be (and I believe they in fact are) more important to account for in any scenario put forth.
Do you also believe that the unobservables are important or not?
I believe that there was something(s) going on inside (not observable) which led to the release and collapse. My assumption is that what was going on was heat driven... causing the frame to become more and more under performing or... driving the axial capacity below the existing load values. (including the safety factor for each particular beam, connection, column and so so forth...
One can't *know" with any precision how these failures and loss of capacity unfolded. One can only see the result which was captured on numerous videos. I don't think the NIST collapse scenario which was driven by floor truss failures makes much sense. So my starting point is that it was core driven failures.
There is no way to set forth a provable model... although I suppose with some sophisticated sim software a core led collapse which produced a close facsimile to the real world collapse should be possible. This is beyond my skill level.
I put our a crude explanation which I tagged *sink hole top drop* which suggests that the heat from fires caused beams at the cash zone inside the core to expand and push standing undamaged columns inward to the center of the core. This should be possible because the columns in the center of core from row 500 south were destroyed by the plane impact and along with the columns the braces came down. This was the *beginning* of the sink hole. It grew in size east, west and south as the fire raged in the core area. The area of destroyed columns (*sink hole*) grew until all but the columns of the 4 corners remained. The belt girder could not span the distance and it collapsed and with it the floors lost core side support and broke free in sections from the facade.
The hat truss was supporting the antenna load and moving it laterally outward from the center of the core.. But the hat truss was not designed to span from facade to facade like a bridge truss bridge does. The hat truss depended on the grid of 47 (actually not all of them) for its support. As more and more core columns failed from the *sink holing* the hat truss buckled in its center... as it did the antenna dropped and the hat truss pulled the facade down. The last remaining columns mostly likely buckled and contributed to the slight tilt, a small amount of lateral translation of the upper facade cage for it to collapse down slipping past the lower intact face it had been aligned with.
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No one apparently want to set forth a detailed sequence of failures because it is driven by assumptions of what was going on inside the core and unseen regardless of how reasonable those assumptions may be.
The same process took place in 2wtc but the structural hollowing out... or sink *holing* progressed from the SE to the NW corner... the top was essentially being cantilevered until the remaining beams and columns could not carry the load... and they buckled... the top was released and dropped as it tipped to the SE.
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911 FF guys correctly identified the collapse mechanism for the intact lower sections, but did not venture into the "initiation" of movement of the top. Major Tom has a degree in physics I believe. femr2 may have as well.
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I am not here to prove anything... make YTs or publish papers. I was interested in finding the explanation for each of the collapses which made sense to me... with my basic understanding of structure as a practicing architect. I share my ideas only to receive critiques to increase my understanding.