9-11- Why the WTC towers collapsed
I'm going out on a limb here, not sure if I can do this, but I'll give it a go. Essentially, want to separate a few topics from the main 9/11 thread because it's gotten so big that it's hard to tell what topics have been responded to and which ones haven't. So here I'll talk about the NIST conclusion of the WTC buildings bowing inwards. I have now read in more depth the pinup concerning how to post on this forum; it says you should only try to quote one paragraph. But if I did this in the case below it wouldn't really say that much. So hopefully I can post the following paragraphs in this case atleast.
Some people believe that the bowing of the WTC towers means that the fire theory works. In the following article, it's shown to be highly questionable.
From Physics911, a Scientific Panel Investigating Nine-Eleven:
http://physics911.net/stevenjones
I'm going out on a limb here, not sure if I can do this, but I'll give it a go. Essentially, want to separate a few topics from the main 9/11 thread because it's gotten so big that it's hard to tell what topics have been responded to and which ones haven't. So here I'll talk about the NIST conclusion of the WTC buildings bowing inwards. I have now read in more depth the pinup concerning how to post on this forum; it says you should only try to quote one paragraph. But if I did this in the case below it wouldn't really say that much. So hopefully I can post the following paragraphs in this case atleast.
Some people believe that the bowing of the WTC towers means that the fire theory works. In the following article, it's shown to be highly questionable.
From Physics911, a Scientific Panel Investigating Nine-Eleven:
The computerized models of the Towers in the NIST study, which incorporate many features of the buildings and the fires on 9-11-01, are less than convincing. The Final report states:
The Investigation Team then defined three cases for each building by combining the middle, less severe, and more severe values of the influential variables. Upon a preliminary examination of the middle cases, it became clear that the towers would likely remain standing. The less severe cases were discarded after the aircraft impact results were compared to observed events. The middle cases (which became Case A for WTC 1 and Case C for WTC 2) were discarded after the structural response analysis of major subsystems were compared to observed events. (NIST, 2005, p. 142; emphasis added.)
The NIST report makes for interesting reading. The less severe cases based on empirical data were discarded because they did not result in building collapse. But ‘we must save the hypothesis,’ so more severe cases were tried and the simulations tweaked, as we read in the NIST report:
The more severe case (which became Case B for WTC 1 and Case D for WTC 2) was used for the global analysis of each tower. Complete sets of simulations were then performed for Cases B and D. To the extent that the simulations deviated from the photographic evidence or eyewitness reports [e.g., complete collapse occurred], the investigators adjusted the input, but only within the range of physical reality. Thus, for instance,…the pulling forces on the perimeter columns by the sagging floors were adjusted… (NIST, 2005, p. 142; emphasis added.)
The primary role of the floors in the collapse of the towers was to provide inward pull forces that induced inward bowing of perimeter columns. (NIST, 2005, p. 180; emphasis added.)
How fun to tweak the model like that, until the building collapses — until one gets the desired result. But the end result of such tweaked computer hypotheticals is not compelling, sorry gentlemen. Notice that the “the pulling forces on the perimeter columns by the sagging floors were adjusted” (NIST, 2005, p. 142; emphasis added) to get the perimeter columns to yield sufficiently — one suspects these were “adjusted” by hand quite a bit — even though the UK experts complained that “the core columns cannot pull the exterior [i.e., perimeter] columns in via the floor.” (Lane and Lamont, 2005; emphasis added.)
http://physics911.net/stevenjones