How did the Twin-Towers steel-core collapse?

Question

If I'm a so-called conspiracy-nut can someone please provide an explanation. The official story explains how the trusses of the towers gave-way and the floors pancaked down on each other. Okay, makes sense, but it doesn't explain what happened to the core. The fire which weakened the steel was at the top of the building (thus weakening the steel at the top only) so how did this cause the entire 110-storey-high steel core to collapse vertically in ten seconds?

Answer 1

It looks like controlled demolition to me. The 9/11 Conmission report, and especially the NIST report virtually ignore the facts regarding the steel core of the building.

One old government report states that
The core columns were box sections fabricated from A36 steel plate and were 36 inches [91.44 cm] x 14-16 inches [35.56-40.64 cm] with plate thickness from 3/4 inch [1.91 cm] to 4 inches [10.16 cm].

So Imagine a pieces of steel 4 inches thick.
Now turn that into a box section 36 inches by 14 inches. That means there is only a 6 inch gap, if we are using 4 inch steel.
It is almost, but not quite, a solid steel piece
36 inches wide and 14 inches thick.

So, you have the idea.

Now, take 47 pieces of steel like that, point them vertically, add cross braces of similar dimensions, and call them the central core. Yes, there were 47 such columns in the central core.
These are the dimensions at the lower floors of the building. Higher up, they came progressively lighter, and eventually used steel ONLY three quarters of an inch thick.

Isn't it amazing how these incredibly strong structures are just simply excluded from all government analyses of the collapse.
The governments latest NIST report implies that there were no central core columns, and that the floors spanned the whole width and breadth of the buuilding, with no internal support. Simply ridiculous.

How did they all break into convenient 30 foot long pieces, the equivalent of three floors each?

How on earth could the floors collapse without leaving ANY of this central core sticking up?

Answer 2

What the "controlled demolition" morons don't understand is that the building wasn't supported from the center, it was supported by the corners. The support of a floor or two collapsed at the center, not the sides, and if you want to understand the effect of g-force amplifying weight in a fall like that, balance a bowling ball on your stomach for a minute, then have someone drop it on you from a mere five feet.

The collapse being from the center, which is what you saw in the films, explains why it fell straight down.

Now, what the "controlled demo" idiots can't explain is this: given that the support for the building was on the outside corners, WHY were there no explosions seen from the corners, if it was a controlled demo?

Idiots, all of them.

Answer 3

It didn't collapse in only 10 seconds. The whole thing was made of metal. Metal can only withstand heat for so long, and can melt over a certain time and a certain temp. I'm not a scientist so i'm not sure what they are. Once those are reached, kaboom. They had an amateur video person doing a life in the day of a firefighter that happened to be doing a video taping on one of the first responders to the towers that day, and you could hear the towers just shaking and rumbling the whole time he was videotaping from the inside. You just knew that something was going to happen because of the noise. This lasted for a long time, several hours at least. I hope they put this video up for sale. I think it was on CBS on 9/11.

Answer 4

Engineers deisgn buildings to collapse vertically..... there isn't much the theorize when you take that into consideration. The planes went through the relative center of the buildings, rather than cutting through a single corner. The collapse did begin in the top-middle region of the towers which (realizing that the force of the upper floors crashing down on top of each other with multi-metric tons of force) would give the building sufficient cause to collapse entirely and uniformly.

I would also imagine that the impact of a several ton commercial jet-liner compounded by hundreds of gallons of jet fuel exploding at the interior of a building would cause a building's superstructure to give way.

Answer 5

You have to remember, those towers were built (Frame-work) in two years. That's about a complete story on each tower a week, (amazing). The only way to do that is by, basically, a slot and peg construction (put slot from girder A into post B. Bolt the two together). It was quick. It allowed enough sway to withstand wind. But it also created many weak spots that traditional building methods didn't. If enough of the peg locations were destroyed, the rest couldn't hold the structure together.

That's why they came down like pancake stacks. The horizontal plains of the floors were intact, but those slot/peg vertical joints gave way.

Answer 6

Prats like you don't deserve an explanation...but here's one anyway.
The immense heat from the burning aviation fuel combined with the weight of a passenger plane would have brought down the toughest of buildings.
As for why the weakening at the top of the tower......try holding one end of a metal spoon and heat the other end over an open flame...then you have your answer as to why the metal at the base of the tower buckled.
THERE IS NO CONSPIRACY BEHIND THE DOWNING OF THE W.T.C..... it was down to some brainless terrorist being told that they would be going to heaven with a load of virgins if they killed innocent people.......what sort of god would ever suggest that.

Answer 7

The center of both buildings contained an elevator shaft. When the planes hit, the jet fuel burned so hot that the heat travelled down the shaft like a convection oven. This ultimately caused structural weakening of the internal skeleton, that why the buildings fell straight down instead of toppling over.

Answer 8

The areea where the plane hit, destroyed the heat shield from around the steal by the force of the impact.

The area there fell down upon the lower structure, But pure weight of the upper part of the building, falling with force caused it to fold up and fall down.

We know the plane hit, people had friends and family on those planes. Perhaps it was one of those 1 in a million odd chances of just the right force at just the right place.

Or perhaps lower grade metal because of crooked contractors or unions ??

Answer 9

Fact Check: The steel melted. The towers fell because of controlled demolition. This is very obvious if you do the research. Watch 9/11 Mysteries and go to www.st911.org.

Answer 10

Just adding to the conspiracy theory whenever there is a disaster if cameras are on site such as the tsunami most of the pictures you get are grainy or out of focus or jittery,So how come pics of the twin towers where in perfect focus and did not show any of the aforementioned errors.One tower maybe but two,NO.