by The Manhattan Project » Sat Sep 16, 2006 6:54 am
World Trade Center Towers
Built in a different manner to traditional skyscrapers like the Empire State Building. A lighter structure based on a "tube" design with the supporting beams around the outside of the structure giving it rigidity instead of the traditional "cage" structure (which has the advantage of providing strength, but at a cost of having many intrusive pillars on each floor).
A central core holding the elevator shafts and stairwells protected by panels of a substance which is incredibly resiliant to fire, but very lightweight and fragile.
The central core and the outer walls were connected by a series of cross-bridges which formed the floors. Each cross-bridge was supported by a series of thin beams linked by trusses, which are lightweight and strong (but weaker than solid beams). All the steel in the core and trusses were protected by a spray-on fireproofing. Able to resist high temperatures, but is highly fragile. This provided an enormous amount of open spaces on each floor.
North Tower/Tower One
Hit full-on. The plane struck directly into the side of the building and continued flying for a while into the core of the building, severely damaging it. The impact also destroyed the stairwells and elevator shafts. There was no escape. The central core continued to weaken until it finally buckled and collapsed. Pulling the outer walls of the North Tower inwards. The antenna atop the North Tower fell straight down. It was directly attached to the core.
South Tower/Tower Two
Hit at an angle, far lower down than the North Tower, and crucially was hit in one of the corners. The plane entered the building and exploded, blowing out many of the outer supporting columns from the the opposite wall to the initial impact. The central core largely remained intact and one stairwell remained open for those fortunate enough to find it. But the damage to the outer beams proved to be too much for the design to bear and they gave way, unable to cope with the extra weight of the building above, cracking almost simultaneously, buckling the already damaged corner, and the damaged side of the building fell away pulling the undamaged side of the building with it. The core remained generally intact and was pulled down with the undamaged side of the building. The South Tower, unlike the North Tower broke in two and toppled over.
In both towers, the force of the blast blew away all the fragile fireproofing leaving the steel exposed to extraordinary heat (caused by the aircraft fuel burning office material).
The towers collapsed due to the way they were hit by the planes. Both differently, but enough. I don't believe the "controlled explosion" theory because it's dependent on two things. 1) the planes hitting the building at exactly the right points where the demolition charges have been set and 2) the demolition team placing explosives at exactly the places that they expected the planes to hit.
It's too precise and fails to consider that no controlled explosions would be necessary since the planes interacting with the building would be more than enough to get the job done.
The idea of clandestine forces creating a "Pearl Harbor" type event intended to rouse the American people to support their government's shadowy agenda (to invade oil rich nations) sounds believable if you subscribe to all that sinister stuff, but the potential gains for the U.S government are IMO outweighed by the risks of the plan being discovered, IE: if the U.S government were discovered to have been behind these attacks and the murder of thousands of American people, it would probably cause a revolution in the United States as the American people murdered their government with extreme prejudice.
The only time a controlled explosion would have entered discussions would have been if say the towers did not collapse and were allowed to burn themselves out over a number of days. Then I would have expected the U.S authorities to declare them a total-loss then either somehow disassemble them or demolish them through implosions.
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