To: Mr. Whist who wrote (190815 ) 10/10/2001 10:41:23 PM From: ManyMoose Respond to of 769670 You had better hope the Bill of Rights stands in whole after all this. When one goes, the rest will follow. If you don't believe this, see the following summary details of an engineering analysis of the WTC disaster: The failure of the World Trade Center was caused by a series of events resulting from the terrorist attack that individually may not have resulted in the catastrope that occurred. The aircraft sheared most of the structural members at the impact site (wingspan about 160 feet vs width of the tower about 210 feet), causing uneven loading on the remaining local structural members, which over time would could cause failure if not corrected. The impact of the aircraft although great obviously did not cause failure (failure occurred sometime later allowing many to escape). The uneven loading although problematic, could have been corrected. The most serious effect found was that some structural members lost more than have of their cross section from the fire, which would cause failure (buckling) of structural members. Adiabatic flame temperature of kerosene = 1727C and the melting temperature of steel = 1570C. Even if the temperature was half the adiabatic flame temperature of kerosene, the metal would creep rapidly, kink a column and buckling failure occurs. The aircraft would have had about 20,000 gallons of fuel, which when burned would release energy equivalent to about 2.4 million sticks of dynamite. Structure fires do not reach this intensity, except in very isolated instances. This is most likely the primary cause of failure. Also, they have found evidence that the aircraft sheared through the structural core of one of the towers The core is designed to maitain structural rigidity and structural integrity if something happens to other structural members and loading is shifted. Presumably this could have happened at the second tower also. Uneven loading, intense heat that could melt or at a minimum cause creep and buckling in the steel as well as loss of the structural core resulted in the failure of the structural members at the impact site and possibly the floors immediately above and below. Once the structure fails locally gravity takes over. In effect the structure below the failure recieves impact loading related to the weight of all the floors above, the drop height and the force of gravity. No structures are built with safety factors to withstand that kind of loading so the towers collapsed with the force growing with each additional floor. Put it all together and you have catastrophe beyond imagination. An interesting question is did the terrorist calculate that failure would occurr as it did or were they just going for a horrific spectacle?