payne1000 wrote:
You are not displaying any intelligence. The three towers which went down on 9/11 all had fire resistant materials which worked very well. What the towers didn't have is explosion resistant materials.
peter, in a futile attempt to break the cement and steel barrier in payne's deluded brain, I've made the following points in other threads:
1) When the jetliners blasted through the towers, the fire resistant material on the support columns was destroyed, blown away like dust in a hurricane. Almost ten stories of steel was laid bare. And,
2). The architect who designed the towers stated in a number of interviews that one of the big factors he had to consider was WIND (He said that withstanding the strike of an airplane was merely an afterthought since the possibility seemed so remote).
At a thousand feet, the wind off NY harbor can reach gale force on a good day. Occupants of the upper floors of the towers mentioned the motion of the building during high winds. Sometimes it was just a slight swaying and other times the movement was quite noticeable. One man said that during particularly high winds, his office had moved nearly five feet off center, creating a sway of almost ten feet. What this means then is that for 28 years, the support columns in the towers were subject to bending in the wind.
A structural engineer mentioned this. He said that even though structural steel is resilient, that the elasticity of the steel was factored into the design, it would still suffer from the effects of bending, much like repeatedly bending back and forth a length of a hairpin. Even if you don't bend it sufficiently to break it, molecular displacement would weaken it.
Though the report you posted did not mention this, tests were run on some of the WTC column fragments that had not been exposed to impact or fire and the original strength had, in fact, been degraded. This alone would not have been the deciding factor in the collapse, yet it may have contributed. The damage to the columns from the crash of the planes and the fires were the primary reason the towers went down. There were no explosives, nuclear or otherwise, involved. It wasn't a government conspiracy, not the CIA, or Mossad or some Zionist plot, it was the work of al Queda and 19 madmen who flew the planes into the towers.
Occam's Razor! Among competing hypotheses, the one with the fewest assumptions should be selected.