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Originally posted by starwarsisreal
how come the event in the video was not on the mainstream history I mean shouldn't it be as famous as the Hindenburg, Challenger, and Space shuttle columbia? This is the first time I've learn about it
edit on 25-9-2010 by starwarsisreal because: (no reason given)
Originally posted by dereks
Originally posted by dampnickers
unlike the WTC towers, which were built to withstand MULTIPLE impacts....
The WTC towers were NOT built to withstand multiple impacts, care to show where the designers claimed that?
Engineers who participated in the design of the World Trade Center have stated, since the attack, that the Towers were designed to withstand jetliner collisions. For example, Leslie Robertson, who is featured on many documentaries about the attack, said he "designed it for a (Boeing) 707 to hit it." 2 Statements and documents predating the attack indicate that engineers considered the effects of not only of jetliner impacts, but also of ensuing fires. John Skilling was the head structural engineer for the World Trade Center. In a 1993 interview, Skilling stated that the Towers were designed to withstand the impact and fires resulting from the collision of a large jetliner such as Boeing 707 or Douglas DC-8.
This is simply not true . The Empire State Building employed interior columns , the WTC did not . The Empire also employed steel beams for floor supports , whereas , the WTC employed lightweight bar-joists for floor supports .
This design had two major advantages. First of all, it gave the building remarkable stability. In addition to shouldering some of the vertical load (the weight of the building), the outer steel columns supported all of the horizontal forces acting on the tower (the force of the wind). This meant the inner support structure was completely dedicated to the huge vertical loads.
This is simply not true . The Empire State Building employed interior columns , the WTC did not . The Empire also employed steel beams for floor supports , whereas , the WTC employed lightweight bar-joists for floor supports
the two towers employ a far more massive design than the empire state building..
The less the building weighs the better the steel can do it's job on a daily basis.
giving me the impression that you are agreeing with me that the towers had less mass than the Empire ?
The Empire had the 'Grid' or 'Cage' design built into it . The towers did not .
The floor trusses, made of some of the thinnest steel in the World Trade Center, almost certainly began deforming before anything else of consequence. At first, the trusses probably expanded, bowing the exterior columns -- themselves thin and weakening in the heat -- outward in places and causing dangerous stresses. All along the eastern face of the south tower around the 80th floor, tremendous fires raged. Eventually the thin steel of the trusses became so hot in that area that they began to soften and sag, hanging like clotheslines between the exterior and core of the building. The sagging trusses tugged inward on their bolted and welded connections to the exterior columns, and those connections began to snap. Video records of the disaster show a line of dust beginning to blow out of the east face around the 80th floor as floors began to slip away from their moorings and fall one upon the other.
Originally posted by weedwhacker
reply to post by dampnickers
Terribly wrong, and not even a close comparison.
VERY different structure (Empire State), VERY different speeds, VERY different impact forces.
Originally posted by Human_Alien
reply to post by GogoVicMorrow
Are you referring to this video? I am getting a little confused here.
If so....then, yes! The plane didn't hit that portion of the structure but it clearly is responsible for whatever caused that fire and subsequent, PARTIAL collapse.
What's the big deal? This isn't reminiscent to the WTC 7-like mystery at all!
A plane hit (several feet away) and the impact-trauma affected the other structure. Looks about right to me.
I am starting to lose the point of this whole debate so please, enlighten me. Thanks