So what caused WTC7 to collapse?

Question

Ok, if the jet fuel caused the towers to collapse, which I do not believe, what then brought down WTC7 in your opinion? This wasn't hit by any jet there was no jet fuel in the building, so what caused every support colume to give way at the exact same time for it to collapse onto it's own footprint?

It might have had slight damage to one side but this would not cause every support colume to fail at the same time.

So gravity cause steel support columes to collapse for no other reason!! That's insane!!!

Very true but you cannot compare the strength of cardboard to the strength of alot of steel support columes

Yes but every singal support colume failed at the same time. Watch the collapse yourself.

The middle of the towers was the MOST supported part of the towers mate. Watch this video if you can http://video.google.com/videoplay?docid=-3135892053682639810&q

Answer 1

WTC7 actually came down in 4.5 seconds. Scientists did an experiment with different pieces of steel that were dropped from the same height as WTC7 and they fell to the Earth in 5.3 seconds. When these various pieces of steel were dropped in a vacuum simulation they came down in 4.5 seconds.
A large vacuum was formed at the base of the WTC7 building by a very large explosion and took out the central support steel, and created a vacuum that let the building fall much quicker than gravity with wind resistance. Do a search for Blue Star Media Group and purchase their video for a scientific explanation of the collapse of all of the buildings on that fateful day. Wait to you hear the series of explosions in the buildings after the planes struck. That is something you did not see on television.
The evil doers cannot change the Law of Conservation of Momentum, Conservation of Mass, Gravity, and chemical reactions with steel and thermite.

Answer 2

Well, its not really intellectually honest to simply disbelieve something you don't like without giving a reason, and then go looking for an answer that you do like. You need to accept facts as they stand. (Not to be confused with opinions; those can be challenged)

The jets that hit the towers were full of fuel (thousands of gallons) and caused raging fires throughout the buildings. Just look at videos. The vertical steel beams cut through the wings and ruptured the fuel tanks at several places. Fuel went everywhere no doubt, including pouring down the side of the building. The heat was sufficient to at least cause annealing (softening) of the structural steel (and possibly some melting too), which in essence changes the material properties and causes it to weaken. Imagine if, instead of steel, the beams were made of plastic. If it gets too warm inside, the plastic begins to soften and can no longer support the load of the floors above it. This is basically what happened. The steel softened to the point where all the floors above being supported by it collapsed down onto the one below it. The weight of those upper floors slammed down so hard on the floor below that that floor also broke free. Now you have the weight of those floors falling, and they hit the next one down which also breaks free, etc.. all the way down.

It might have actually been better if the plane had hit the top floor, since there would have been little weight above the failing columns to start a pancake action. But hitting the building several floors down meant that when the floor collapsed where the plane went in, the weight of everything else above it came down too. And, can't forget the weight of the plane itself.The plane went in but didn't come out, so the structure below had to suddenly support a tremendous amount of additional weight.

To your point, you don't need all of the support columns to fail at the same time. You only need enough of them to fail such that the weight of even a partial collapse is enough to cause the floor below to let go. Remember too that the fire burned up, and undoubtedly weakened the supports of more than one floor. When the floors begin to pancake down, nothing could stop it except the ground.

The floors will fall straight down since there aren't any significant side forces acting on the building. That is, the building was built nice and plumb, so when a floor lets go, it falls straight down.

Another simple analogy is a house of cards. Build one as many levels high as you can. If you then proceed to knock a level out thats one or two down from the top, then the weight of the upper levels comes crashing down on the lower part of the card house, taking the whole thing out. And the cards largely will fall straight down.

If the damn lib media would ever show the video footage on TV, you will clearly see planes crashing into the towers. This is undeniable; if you choose to disbelieve it, you must either be a fool or a radical Muslim.(hmm.. not a lot of difference there, come to think of it).

Anyway, hope this helps.

Answer 3

This Subject has been studied to death. The March 2005 issue of Popular Mechcanics Magazine covers this and other 9/11 Myths. 300 independent experts in Engineering, aviation, photography, air crashes & air defense looked at every one of these stupid things. WTC 7 suffered a progressive collapse. 1/3 of the building on the south face had major damage extending 10 stories. A fire burned on the fifth floor for 7 hours. The combined structure damega led to a failure of the building.

The fact is you lack any realy knowledge of structural enginering, statics or dynamics. I have, thankfully... As hard as it is for you people to understand, there really is no great mystery here. National Geographic & PBS have both done detailed programs on the science of these events as well the PM issue.


Now go back to looking for the guy on the grassy knoll......

Answer 4

I would guess the three buildings were rigged with C4. How else could you bring three buildings down so beautifully; especially, buildings designed with such an impervious center support.

A close examination of the scrap metal, by an independent investigation team, could prove it. All you would have to look for is explosive scaring. Oops, I forgot that evidence was illegally discarded; how convenient. To think that something so professionally monitored and controlled and in an emergency situation, would have been allowed to be destroyed.

How unfortunate too; this type of thing could help divide a nation. Why would anyone want to do that ? Hmmmm ! I smell a snake, from the size of it's tracks, it is a big dangerous one. One of a size, that has not shown its evil face since WWII.

Don't waste to much energy trying to convince those who can not sense it. Deep down, they do not care to. They know this snake will not harm them. This snake is only dangerous to those who care about evil and social injustice. I know, I have a family member who has a heart filled with such frustration and contempt, he refuses to even consider the possibility. Further, he tends to support the methods of the snake. Such is the time.

Answer 5

The support columns couldn't support the top half of the buildings, It's like when you have a durable cardboard box next to you. If you gently step on the sides of the box, It should support your weight pretty well. Now try leaping onto the middle of the cardboard box. It will collapse.

The floors were collapsing into the middle of the towers where it isn't supported as well.

Answer 6

Their was a balance difference in the tower. This difference put more stress on parts of the building that cant handle that much stress. Thus is collapses

Answer 7

it maybe the e was set at the foundation of the wtc. wtc falls down to earth with speed more than if it would free fall. the fall of concrete from the wtc if calculated back are not satisfied with the equation of free fall. explosion at the foundation may cause a downward thrust that may cause the wtc to fall with faster speed tha n it would be. plus jet fuel carried by the plane that hit wtc are not enough to make reinforced concrete to fail from the foundation itself. it is make sense if only part of wtc collapse but with the whole wtc fall there maybe something that cause it to collapse like that.

Answer 8

Do you ever undergo in innovations earlier 9-11-2001 there grew to become right into a employer gaining repute for his or her information in taking down latest homes with strategically placed dynamite? valuable, a development between 2 that mandatory to be taken without delay down? Or a development next to a school that mandatory to fall left. Or close to a eating place district and the fallout had to pass 'away' from that area. ET CETERA. Uh, I quit listening to approximately them, yet there grew to become into greater advantageous than one documentary. and then theres a close-by employer that makes use of dynamite on a regular basis, with a of course seen semi loaded, storing their dynamite, and a 300 and sixty 5 days or so earlier 2001 all the dynamite grew to become into stolen-and that didnt make the information.nicely, ok, twist of fate. yet...what a pair of considerable city's newspaper percentof the owner of this employer and Israels best Minister shaking palms?nicely, ok, no relation between those issues. who knows? I dont. I in simple terms comprehend that. Meaningless, significant...yet another ask your self of the "international".

Answer 9

Pretty simple really:

Several hours of uncontrolled fire.

Oh yeah, and another building fell on top of it.

Other than that, it was in great shape....

Answer 10

gravity