01-10-2013, 02:49 AM
Tony Szamboti Wrote:Jeffrey, it certainly wasn't hot trusses that caused the collapse as they couldn't do what NIST said (pull in the perimeter columns) even at 700 degrees C, and the likelihood of the core columns being at high temperatures after an hour is slim to none due to their interconnectivity and bulk.
I think the core columns showed evidence of some type of devices having been used on them (either extreme heat, much hotter than fires could produce, or explosives) and that is why most of it was not saved. This isn't hard to figure out and it is certainly evidence of a cover-up.
There are obviously areas of missing data... temps being one, how many columns were destroyed or compromised by the plane strike another, how much of the core bracing in the plane strike zone another, how much fire protection was removed by the plane slamming through the core region, how much fuel from the plane made it into the tower and where did it end up (presumably the south side because of momentum), what part of the frame was affected by the heat... connections, bracing... how much elongation / warping from heat was taking place. The situation was chaotic and dynamic and three dimensions and the processes worked over an hour and a half in 1wtc.
We do know that heat weakens steel, causes it to distort and this could shear bolts and fail connections. The steel does not have to melt for the frames performance to drop below spec... locally and then cause load redistribution and cascading structural failures inside the core eroding the axial capacity over time. The process was progressive and dynamic. To clearly model this transducers and more data would be required. Yet we do see some pre release movements indicating that the structure within the upper section was under sever stress and much of it has failed. Runaway progressive failure show failures at an increasing rate until the system completely fails catastrophically and in an instant... the so call "rapid onset" that Gage refers to. This is when the system passes from stable and able to support loads to unstable... and is a well understood phenomena.
There is adequate data to strongly suggest a natural (heat related) runaway progression of failure within the core while there is no data to suggest that the process was one of placed devices. And this does not consider that said devices would have had to withstand plane impacts and fires for 1.5 hrs before being triggered by some mysterious mechanism.
"Boss, are we ready to hit the red button and blow the tops yet?"