NIST officially kills Pancake Theory. "Most of the world's structural engineers" scurry to defend latest official bunk.
Someone very astute here posted this earlier, but I think it bears reiterating.
Pancake Theory is officially dead.
“NIST’s findings do not support the “pancake theory” of collapse which is premised on a progressive failure of the floor systems in the WTC towers (the composite floor system - that connected the core columns and the perimeter columns - consisted of a grid of steel 'trusses' integrated with a concrete slab). Instead, the NIST investigation showed conclusively that the failure of the inwardly bowed perimeter columns initiated collapse and that the occurrence of this inward bowing required the sagging floors to remain connected to the columns and pull the columns inwards. Thus, the floors did not fail progressively to cause a pancaking phenomenon.”
"...the occurrence of this inward bowing required the sagging floors to remain connected to the columns..."
“NIST estimated the elapsed times for the first exterior panels to strike the ground after the collapse initiated in each of the towers to be approximately 11 seconds for WTC 1 and approximately 9 seconds for WTC 2.” “Since the stories below the level of collapse initiation provided little resistance to the tremendous energy released by the falling building mass, the building section above came down essentially in free fall, as seen in videos.”
“The condition of the steel in the wreckage of the WTC towers (i.e., whether it was in a molten state or not) was irrelevant to the investigation of the collapse…”