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Prof. Bažant et al., page 7/11 : The fact that some perimeter columns showed gradually increasing lateral deflections, reaching as much as 55 in. (or 1.40 m) [NIST (2005), part NCSTAR-1, Chapter 2, p. 32 and Fig. 2–12], cannot be explained as anything other than creep buckling of heated columns.
Prof. Bažant et al., page 7/11 (Journal page 920) : The aforementioned crude estimates suffice to make it clear that the combination of asymmetric load redistribution among columns in the aircraft impacted stories with the heating of steel to about 250°C (or even less) was likely to lead to a loss of stability attributable to creep buckling of the most overloaded columns within the observed time. Given the sustained elevated temperature caused by the stripping of insulation and the severe and asymmetric damage to many columns, as estimated in the NIST report, it would, in fact, be rather surprising if the towers did not collapse.
Prof. Bažant et al., page 8/11 (Journal page 921) : It was hypothesized that the lateral bowing of perimeter columns was caused mainly by a horizontal pull from steel trusses sagging because of differential thermal expansion.
However, this hypothesis is not credible. As simple calculations show, the temperature difference between the lower and upper flanges of a floor truss would have to exceed 1,000°C to produce a curvature that would shorten the span of a sagging floor truss by 52 in. (1.40 m.) Such a temperature difference is inconceivable. The differential thermal expansion must have been only a secondary triggering factor, which created a small initial imperfection in the overloaded columns, to be subsequently drastically magnified by creep buckling.
andy1972 : that the "terrorists" responsible for 9/11 had direct contact with high level Saudi officials, Saudi security services and were in some cases even funded by them, including the Saudi ambassador Prince Bandar, a near member of the Bush family.