How did WTC 7 collapse?
409589
Building 7 was the third skyscraper to collapse into rubble on September 11, 2001. According to the government, small fires leveled this building, but fires have never before or since destroyed a steel skyscraper. \n\nThe team who investigated the collapse were not allowed access to the crime scene. By the time they published their inconclusive report, the evidence had been destroyed. \n\nWhy did the government rapidly recycle the steel from the largest and most mysterious engineering failure in world history, and why has the media remained silent?\n\n\n\nI have no opinion
225303
The building will burn down.\n\nGood advice: RUN, RUN, RUN ... AS FAST AS U CAN!!!
1063847
There is no proof. All the evidence disappeared to China or the bottom of the ocean. Why were they so quick to get rid of that steel? Do you really believe that jet fuel gets hot enough to collapse an I beam? Hell, I've picked out beer cans after a bonfire. Duh! And as far as I know, airliners aren't made for knocking down buildings. They are light so they can fly. Have ever seen a crash site? There usually isn't a whole lot of recognizable things left. A building that would collapse after getting hit like that wouldn't pass a NYC building code exam.
1008555
Good Question. \n\nOne of the three buildings was not even hit by an airplane (building seven) and it still went down.  Sounds like this may be an inside job, but who and why?  To bad most of the evidence was sent to China and melted down before any further investigation could be conducted on it.   \n\nBuilding seven was supposedly  pulled, meaning brought down with explosives.  The question here is when was there time after the fire started to set the charges in place?   There are more questions then good answers.  Could it be that all three buildings were rigged before the fires? \n\nWho could possibly have benefited by such an awful act, who had motive, Who had the opportunity  and why is a lid being kept on it?\n\nI'm sorry, I am afraid I have more questions than answers.
649228
I have not seen this but i can only imagine the theory behind 9/11.  I know that it was not by accident that the twin towers came a tumblin down...but i also know that it would never have happened if the gov't wasn't in on it. It is just to tragic and too big of a game for it to happen on American soil.
246334
I think there was more to the high-jacking than we have been told. Why I do not know...There has been a lot of talk about the way the twin towers fell. \nThank you for sending this I have enjoyed.
556301
What denial am I, as an American that was standing in front of the World Trade Center as the first jet crashed into the building in?  Please elaborate &  I'll tell you if my eyewitness account jibes with your story.
749900
I actually saw a documentary on this, on the channel "Discovery Civilizations".\n\nBasically, it said the whole area is tectonically unstable and laced with pockets of underground gas.  There was an earthquake, that resulted in liquefaction of the sands, and the entire cities slid right into the sea.  The fires were the result of friction lighting the gas pockets on fire.   \n\nIt would have been horrifying to behold.
635126
C’mon: Do you really think nineteen guys with box cutters were behind 9/11? Then why, when no steel-frame building had ever collapsed from fire, did three fall down that day? (One, 7 WTC, wasn’t even hit.) How could a terrorist’s passport emerge in perfect condition? Why was it so important to clear debris before all the bodies were recovered? Did the U.S. secretly plan the whole thing? The 9/11 conspiracy theorists have it all figured out.
627896
First tower was hit between the 93rd and 99th floor.\nSecond tower was hit between the 77th and 85th floor.
796266
I don't think it was the fire, it seemed odd at the time. Wasn't #7 where the city's emergency bunker was?
555431
Fires cause most of the destruction after the Earthquake. So surviving buildings would probably suffer the most in the hours after the Earthquake.
220089
There is much lecture in internet about this issue. Here are two sites that show some conclusions.\n\n"Ineffective fireproofing and a shortage of staircases were the main reasons for the collapse of the World Trade Center, according to a report released Tuesday and led by Dr. Shyam Sunder, Acting Deputy Director of the Building and Fire Research Laboratory (BFRL) at the National Institute of Standards and Technology (NIST)."\nhttp://www.indolink.com/displayArticleS.php?id=040805021055\n\nAccording to an analysis by a leading fire-safety expert, had the fire-proofing insulation on the towers' steel structures been thicker, the towers would have survived longer and might even have remained standing after they were hit by the hijacked planes.\nhttp://www.newscientist.com/article.ns?id=dn3354
688936
Did you know Babylon is the Great city which is  New York and the "whore of Babylon" is the statue of Liberty. When it state babylon "IS FALLEN, IS FALLEN" THATS THE WTC "IS FALLEN TWICE IS BECAUSE BOTH TOWERS OF BABYLON WERE COMING DOWN. Just like Babylon of old the tower of the world power fell. then it goes on to say that a angel took a stone and cast it in the sea and that Great city was seen no more.\n\nAnd no the want close the borders.
985989
Still trying to prove that the 9/11 attacks were an inside job by the CIA and federal government, eh?\n\nThe fuel fire did not vaporize 100 tons of steel and titanium.  But by heating the metals, they softened them so much that the structural beams sagged and collapsed.  Once the upper floors of the building started to move, there was so much momentum going that it cause the lower floors to fail, too, and just kept going until it hit the ground.\n\nOn the other hand, all I have to do is provide enough heat to the metal to cause it to vaporize -- the temperature of the flame itself is not critical here -- just the total amount of heat produced.
812736
It was Osame Bin Laden as I've heard.\n\nBut what I don't understand is... ten minutes before the plane crashes to the towers, all the security shuts down. Meaning security guards, police, everything in the building just stops. And on that day the Jews didn't go to work at all. Then, right whent the first tower gets hit, they don't evacuate the second building. They let nobody out and said for all the employees to go back to work. Now tell me, shouldn't the entire area of the wtc get evacuated? Why did these coincidences happen? I have no clue, but there can be a catch here. That's why there's rumors that the US let this happen, because of these situations. I personally am still trying the research and add things up. There has to be another logical reason. And I'm not lying when I said those things. There's probably plenty of more coincedences around too.
1173234
You should know, AS A STRUCTURAL ENGINEER, that steel has a melting point at about 2750 degrees farenheit.\n\nYou should know, AS A STRUCTURAL ENGINEER, that steel loses half of its strength at about 1100 dg farenheit, and at 1800 dg F it loses about 90% of its strength.\n\nJet fuel does not burn hot enough (800-1500 dg F) to MELT the steel, and the towers did not come down because the jet fuel melted the steel.  The jet fuel burned off in a matter of minutes, but it was the ignition source for other combustible material, that heated the steel enough to weaken it and cause the structural failure.  Official investigation reports that pockets of the rubble were burning at about 1832 dg Farenheit.\n\nAS A STRUCTURAL ENGINEER, you should also know that a "pancaking" EFFECT is the result of structural failure of the floor support system, and can be caused by many forms of structural catastrophe, including weakened support by fire, physical damage, etc.  The CAUSE of those things can be planes slicing through steel, fires, and yes demolition teams destroy support systems to bring down buildings as well.\n\nJust because the effect is the same doesn't mean the cause is the same.  Of course, you already knew that because YOU'RE A STRUCTURAL ENGINEER, right?\n\nAS A STRUCTURAL ENGINEER, you should know how the towers were constructed and study the report before you make conclusions agreeing with a conspiracy theory.\n\nDo your homework with facts, not conspirasites.  It will serve your career better.