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Originally posted by talisman
The taller the building, the much much more it is over designed for events such as uncontrolled fire and even damage.
Originally posted by LeftBehind
So are you trying to get us to believe that the building was designed to withstand being hit by one of the Towers, burn for hours and still survive?
I don't suppose you have anything to back this up?
Or maybe someone has some positive evidence for explosives?
If there are people out there who believe that asking for evidence is some sort of tactic, well its no wonder these bomb theories are believed by so many people.
There is no evidence for bombs and there is no reasonable explanation as to why bombs would even be used, and yet so many cling to this pseudoscience.
This doesn't make a difference. Ultimate shear, stress, strength in design would be relative to the floors and such. Meaning that beams, columns, composite flooring etc. would be designed for the ultimate allowable shear, stress, strength ect. It doesn't change with the weight, size of the steel etc. What governs design is the allowable shear, stress, bending, buckling ect.
To further illustrate, say the design allowable strength is 50. A smaller building with less weight would have smaller steel members because the weight would produce smaller stresses. Now, say a larger building has an allowable strength of 50. The more weight will produce more stress, so you need to have bigger members to deal with that stress. But the bottom line is that the allowable strengths, stresses, bending moment etc. would be the same for both buildings (from some code like the BOCA). So, therefore, having the same allowable and ultimate strength would produce the same situation relatively.
Or maybe someone has some positive evidence for explosives?
Prof. Steven Jones, who conducted his PhD research at the Stanford Linear Accelerator Center and post-doctoral research at Cornell University and the Los Alamos Meson Physics Facility, has analyised materials from WTC and has detected the existence of thermate, used for "cutting" the steel support columns, as evident in the photo below.
Originally posted by etshrtslr
Here is some evidence of explosives!
Originally posted by etshrtslr
Here is a picture of a cutter charge being placed on a steel beam for demolition.
Notice the angle its being placed at.
Originally posted by whiterabbit
An explosive charge doesn't leave metal slag pooling all over it like that. It breaks the steel with force. There's heat, but it's too quick to melt steel like that.
[edit on 12-3-2007 by whiterabbit]
This guy (the NIST engineer in question) apparently knows less of what happened at the WTC than most of us here.
Originally posted by etshrtslr
If no explosives were used in the demolition of WTC 1,2 &7 then what caused the molten steel weeks after 9-11?