How can two110story steel and concrete buildings fall to the ground in10seconds(freefall) without explosives?

Question

And how can all that concrete turn to powder, apparently before even hitting the earth,, where did all that energy come from to completely pulverize 110 steel reinforced concrete slabs, break hundreds of steel columns, AND allow the entire structure to come to rest in only 10 seconds ? A billiard ball would take 10 seconds to fall 110 stories.. How can an entire steel and concrete structure, not only collapse at freefall speed, but also become pulverized, and shreeded on the way down ? This problem bothers me alot. I want real answers please,, thank you..

Answer 1

I was a steel worker for a while and became very familiar with the properties of steel. By training I am an electronic technician. One of my jobs was to test the air inside the annealing chambers before the two story high furnace was placed over them. This test involved placing a strip of steel between two posts and then covering them with a large test tube that went into a stopper at one end. from the stopper came a rubber hose that plugged into an air nozzle. The air came from inside one of the chambers. I would then run a large current through this strip of steel for one minute. If the steel strip turned blue the test was a failure because of oxidation. If the strip remained grey it passed. It was very evident to me that the steel's properties changed over many heatings. It became brittle and weak. When those planes hit the WTC towers they introduced tons of aviation fuel into the structures. At the steel mill we used natural gas in a controlled manner to heat steel precisely for a predicted outcome. Aviation fuel burns far hotter and given the way it was applied to the WTC towers, it is obvious there was no control. I'm sure that a metallurgist might have been able to predict the outcome. The steel that supported the structures became brittle and turned to powder. The floors above the impact sites just fell and, with inertia, just kept on going. I would imagine the fuel didn’t just stay on the impact floors either. It must have leaked down to lower floors. Remember there were tons of this, already burning, aviation fuel. Those towers were not designed to hold liquid. I can imagine the stuff leaking through the ceilings and burning as it went down, incinerating everything in its path.

Answer 2

It could have been a false flag operation but I don't have any real evidence that it was or that explosives were used. What about this possibility? The steel support pillars conduct heat in a way that can be understood by a simple mathematical relation. For example if you touch a ten foot long steel rod to a hot stove element and hold it at the other end, your hand will begin to burn after a certain length of time and the temperature along the rod will be proportional to the distance from the heating element. The equations used to determine time and temperatures will be exactly the same for every rod with exactly the same type of steel. Fires near the top of the tower weakened but did not melt the steel support pillars. The weight of the building above the fires together with the weakened steel pillars began to bring the building down. The steel pillars would have been weakened less and less all along their length toward the ground and so why would they have buckled? Simple. The weight of the building above putting pressure on them would be increasing as the tower was going down. So let's go to the bottom of the tower: The steel support beams would have been at their strongest but the weight of most of the building would have been above and coming down on top of them. Alex Jones hasn't convinced me that 911 was a false flag operation. I have given him and his team a lot of time and opportunity and they still haven't done it. He has convinced me that some global elites worship a 40 foot tall owl in the Bohemian Grove but some things that he believes are wrong. For example he believes that people have "reptilian brains". He will tell you that his theory is scientific and cannot be disproved. I am absolutely certain that people do not have reptilian brains and his theory is unscientific and ridiculous.

Answer 3

Think how heavy all the floors above where the steel supports melted weight. The weight of an entire building by themsleves, right? So, once the steel supports finally gave way, all that mass came down WITH INERTIA on each floor below, smashing each one, one by one, all the way down. The steel and concrete was strong enough to support the weight above it AT REST. But, add the downward inertia once it got going and they would crush in an instant.

To compare the difference in force yourself: Put your hand, palm down, on a table. Now lay something heavy on it, like a brick. Feel that weight? Now: pick up the brick, even just a few inches, and let it drop on your hand. Hurt like hell? Now you get it.

Answer 4

Well, first off, a f""kin' airplane REALLY flew into it and REALLY EXPLODED with a virtually full load of REAL jet fuel. If this "problem" bothers you, the problem that bothers me is that people continue to look for reasons why this was ultimately somehow the US's fault.

This happened because a bunch of weido's with too much money and not enough phallus decided that it'd be FUN to get a bunch of lonely losers to do whatever they told them to do, including get on a bunch of planes and fly them into buildings.

If these jokers really want to meet Allah, why don't they all get into one of their own buildings and fly a plane into it. Oh, that's right, they don't have the capability to create such structures on their own...

That's right, I'm an American, and I love this country. And in case you're not paying attention, Iran's next.

Answer 5

That is a type of progressive collapse.
Generally in the framed structures slabs transmits the load to beams and there by to column. so, in any floor the beams will be designed to withstand trhe loads from that floor only. In a progressive failure, the failure in a upper floor makes the lowerfloors to take the additional loads. Since they are unable to with stand the excess load, they fail. similarly the lower floors continues to fail. this is the progressive failure. Please note that a sudden collapse make the lowerfloor components to undergo shock loading, which cause moments as high as twice that of gradual loading. form work failure and canoply slab failures are the examples of progressive failure.

For further details please search the web with the phrase 'progressive collapse' and

read the doscument at

civil.northwestern.edu/people/.../ProgressiveCollapseWTC-6-23-2006.pdf

Answer 6

The above answers all apply. Added to the initial explosion of the plane, the fire fueled by thousands of gallons of jet fuel was enough to weaken the steel columns andcause teh collapse at teh top,. which pancaked all the way down.

Answer 7

Air friction doesn't play much of a role. Combustion requires oxygen, and in some cases, this can create a partial vacuum. The hot air is thinner too.

Answer 8

It has bothered me a lot too. I have discussed it with my dad, who is an engineer, and he said it is impossible without explosives on the interior core and the exterior steel columns.

Answer 9

There have been a few documentaries about this very issue here is a link to explain it to you http://www.tms.org/pubs/journals/JOM/0112/Eagar/Eagar-0112.html

Answer 10

wind