Was the collapse of WTC 7 a unique and unexpected event? Yes. But man-made structures have been failing expectations since the Tower of Babel. There were a couple of major design defects in the structure of WTC 7 that were exposed by the uncontrolled fires: Some long-span floor systems on the lower floors exposed a major weakness. Secondly, it was found that there were key columns in this structure which, if they failed, would lead to a progressive collapse of the whole structure, which to a trained eye is clearly what transpired. This was not a controlled demolotion, it was a progressive collapse triggered many seconds beforehand by the buckling of only a certain beam (79), which itself was triggered by 8 stories of floors giving out due to raging fires in those parts. The collapse of those floors removed support for that major beam, which when it buckled eventually lead to a progressive collapse of the whole structure…
It (WTC7) had very heavy fire on many floors and I ordered the evacuation of an area sufficient around to protect our members, so we had to give up some rescue operations that were going on at the time and back the people away far enough so that if 7 World Trade did collapse, we wouldn’t lose any more people… ~ Chief of the NYC Fire Department Dan Nigro
Excellent analysis, deals with nine assertions that claim evidence for the use of controlled demolitions in the collapse of the three WTC towers on September 11. ASSERTION #1: The towers’ collapse looked exactly like explosive demolitions.” Response: No they didn’t. It’s the “where.” ASSERTION #2: “But they fell straight down into their own footprint.” Response: They did not. They followed the path of least resistance, and there was a lot of resistance…