Why were the steel structures and all columns of the whole World Trade Centre collapsed?

Question

to ground without leaving any up-ejecting structures...?

Answer 1

Everyone knows this was an inside job, the placing of explosive. Larry Sliverstein (99 year lease from the government) made it big with the insurance policy, the building fell onto its self like a demo job. Larry Sliverstein admitted on PBS. "This admission appeared in a PBS documentary originally aired in Sept. of 2002 entitled "America Rebuilds". Mr Silverstein's comments came after FEMA and the Society of Civil Engineers conducted an extensive and costly investigation into the curious collapse of WTC 7."

Since no steel high-rise building has suffered a total collapse from fires before or since the 9-11 attack, proponents of the controlled-demolition hypothesis argue that the collapses of 1, 2, and 7 WTC are difficult to attribute to fires. The twin towers burned for less than 102 min (1 WTC) and 56 minutes (2 WTC), during which both towers were stable after the impacts. 9/11 researchers consider the following high-rise fires to be the similar for comparative purposes:

New York Plaza (1970) - burned for more than 6 hours, no collapse.
First Interstate Bank (1988) - burned for 3 1/2 hours, gutted 4 floors of the 64-floor tower, no collapse.
One Meridian Plaza (1991) - burned for 18 hours, gutted 8 floors of the 38-floor building, no collapse; later had to be demolished.
Torre Este de Parque Central (Venezuela) (2004) - burned for more than 17 hours, spread to over 26 floors, no collapse.
The Madrid Windsor Tower (2005) - a partial collapse of some steel sections of the building while the concrete framework prevented a complete collapse.

Telltale signs of controlled demolition

Radial symmetry: The towers came straight down. The debris was distributed symmetrically in all directions.

Rapid descent: The towers came down just slightly slower than the rate of free fall in a vacuum.

Demolition waves: The collapsing towers appeared greatly similar to buildings being demolished with synchronized rows of explosions.

Demolition squibs: As the towers collapsed they exhibited what appeared to be high-velocity gas ejections well below the descending rubble.

Pulverization: The towers' non-metallic components, such as their concrete floors, were pulverized into fine dust.

Totality: The towers were destroyed totally, their steel skeletons shredded into short pieces, most less than 30 feet long.

Answer 2

The heat of the fire caused by the plane explosion caused the beams on that particular floor to fatigue or its fatigue point was lowered by the heat. Once steel hits its fatigue point it will collapse. The beams therefore collapsed on that particular floor and the weight of the floor beams below now had to carry the load of all the floors above which it could not hold causing it to collapse. This happened to all the floor beams below causing the domino effect. The reason why no columns were left standing is because of the enormous weight and the beam connections to the columns pulled the columns also to the ground.

Answer 3

The WTC building were constructed with a "exoskeleton" design, this design distributed the building weight to the outer walls (this allows a open space in the center) now the outer structure are tied together in the center that separated the floors, these steel beams were overheated and thus weakened because of the intense heat from the plane fuel and collision, thus the building imploded from the inside to the outer structure.

Answer 4

I do agree with st_pete30!
Structurally speaking there is no way for the towers to fold and collapse from their foundations when they were hit at the thirty-some floors. Therefore, there is no question in my mind that all three buildings were imploded by government experts who were in-communicato with the so called Muslim terrorists. The Muslim terrorists were used by our own government terrorists in partnership with others. One can go on the Internet and see what is said about the whole fiasco by expert scientists and engineers.

Answer 5

They fell from the warmth brought about by capacity of the hearth from the plane crashed. particular, it DID get that warm, and no, there have been no longer "thermal satellite tv for pc photos" suggesting otherwise. no person pronounced the steel MELTED. the warmth from the hearth brought about the steel to advance in this manner of trend that it catestrophically broken the integrity of the form, and it brought about it to interrupt down.

Answer 6

because the force of the plane and and fuel explosion weakening the structured bend it or whatever then with the weight of higher flors it buckle and then you get a dominoes effect with other floors buckling under the rest

Answer 7

The terrorists planned it out so that they hit the buildings at the exact angle that would cause the buildings to collapse. They talked about this on the news right after it happened.

Answer 8

pre placed bombs, put there by the secret servises.