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originally posted by: MALBOSIA
originally posted by: AnteBellum
The trade canter was designed to withstand a major fire. Open plan as they call it, no intermediate columns to impede floor/office space. It had a central structural core and a perimeter structural support system that tied both together using trusses. Think of it like this, if you place a board across two stacks of bricks then load weight onto the middle of the board the board will deflect down. But also the bricks will deflect inward where they touch the board at the top. Replacing this all with a metal system, then heating it up and dumping the rubble of a jet on top, greatly increases the elasticity of the metal, causing even more deflection. Once one floor was compromised it was over. When structurally designing a building you start at the top and work your way down, as for loading conditions.
Building 7 was structural different - simple steel construction with a curtain wall I believe, without details it's hard to tell but most likely it is. Most demolition crews use as little explosives as possible to exploit the design used on the buildings there trying to bring down, but it all depends on the design. Gravity has no problem pulling everything down you just have to know where to start. In building 7's case taking out columns 58-81 would pull everything inward, then down, all else that would need to be done is cut some of the perimeter columns like chopping down a tree to help it along.
Sorry I'm rushing, If I did a bad job explaining something please let me know.
Those were cold joints all the way down the tower. Nothing 5 floors below the impact was damaged. Considering path of least resistance, why didn't the top section eventually work is way off to the side where there is little to no resistance in that direction? Instead of following this rule, the top section decided to instead plow it's way through hundreds of feet of cold steel joints and concrete.
What pancake theory describes is how if I tossed my 5 year old up in the air and tried to catch him I would be reduced to a pile of bones with my flesh and skin turned to dust.
Maybe I read your example wrong but isn't your example of a board laying across bricks excluding the central columns?
LOL I honestly couldn't tell if your backing up the official claim or arguing it. 1&2 sounded like you believe the Discovery Channels bubble-gum explanation using pancake theory but in #7 it sounds like you believe the building had some help coming down.
originally posted by: scottyirnbru
originally posted by: MALBOSIA
originally posted by: AnteBellum
The trade canter was designed to withstand a major fire. Open plan as they call it, no intermediate columns to impede floor/office space. It had a central structural core and a perimeter structural support system that tied both together using trusses. Think of it like this, if you place a board across two stacks of bricks then load weight onto the middle of the board the board will deflect down. But also the bricks will deflect inward where they touch the board at the top. Replacing this all with a metal system, then heating it up and dumping the rubble of a jet on top, greatly increases the elasticity of the metal, causing even more deflection. Once one floor was compromised it was over. When structurally designing a building you start at the top and work your way down, as for loading conditions.
Building 7 was structural different - simple steel construction with a curtain wall I believe, without details it's hard to tell but most likely it is. Most demolition crews use as little explosives as possible to exploit the design used on the buildings there trying to bring down, but it all depends on the design. Gravity has no problem pulling everything down you just have to know where to start. In building 7's case taking out columns 58-81 would pull everything inward, then down, all else that would need to be done is cut some of the perimeter columns like chopping down a tree to help it along.
Sorry I'm rushing, If I did a bad job explaining something please let me know.
Those were cold joints all the way down the tower. Nothing 5 floors below the impact was damaged. Considering path of least resistance, why didn't the top section eventually work is way off to the side where there is little to no resistance in that direction? Instead of following this rule, the top section decided to instead plow it's way through hundreds of feet of cold steel joints and concrete.
What pancake theory describes is how if I tossed my 5 year old up in the air and tried to catch him I would be reduced to a pile of bones with my flesh and skin turned to dust.
Maybe I read your example wrong but isn't your example of a board laying across bricks excluding the central columns?
LOL I honestly couldn't tell if your backing up the official claim or arguing it. 1&2 sounded like you believe the Discovery Channels bubble-gum explanation using pancake theory but in #7 it sounds like you believe the building had some help coming down.
And in your post you prove you don't understand pancake theory. It's to do with loading. If the next set of columns can't support the load they'll give way. And so on and so on. In structures that's called progressive collapse. What you tried to describe with your five year old is only applicable if all joints in your body can't resist the load placed on them. They'd fail.
The path of least resistance is actually vertically downward. Steel loses 50% of its strength at 550c, 90% at 800c. Jet A-1 burns at roughly 1000c. Heck, a candle can be over 750c. The steel doesn't need to melt, that point is much further up the scale, it just needs to lose its load bearing capacity. That's day one in a structures classroom. It's a testament to the architects and engineers that the building survived that long.
EVERY SINGLE LOW LEVEL COLUMN WOULD HAVE HAD TO FAIL AT THE EXACT SAME TIME FOR IT TO FALL WITHOUT BANKING IN ONE DIRECTION OR ANOTHER.
originally posted by: MALBOSIA
originally posted by: scottyirnbru
originally posted by: MALBOSIA
originally posted by: AnteBellum
The trade canter was designed to withstand a major fire. Open plan as they call it, no intermediate columns to impede floor/office space. It had a central structural core and a perimeter structural support system that tied both together using trusses. Think of it like this, if you place a board across two stacks of bricks then load weight onto the middle of the board the board will deflect down. But also the bricks will deflect inward where they touch the board at the top. Replacing this all with a metal system, then heating it up and dumping the rubble of a jet on top, greatly increases the elasticity of the metal, causing even more deflection. Once one floor was compromised it was over. When structurally designing a building you start at the top and work your way down, as for loading conditions.
Building 7 was structural different - simple steel construction with a curtain wall I believe, without details it's hard to tell but most likely it is. Most demolition crews use as little explosives as possible to exploit the design used on the buildings there trying to bring down, but it all depends on the design. Gravity has no problem pulling everything down you just have to know where to start. In building 7's case taking out columns 58-81 would pull everything inward, then down, all else that would need to be done is cut some of the perimeter columns like chopping down a tree to help it along.
Sorry I'm rushing, If I did a bad job explaining something please let me know.
Those were cold joints all the way down the tower. Nothing 5 floors below the impact was damaged. Considering path of least resistance, why didn't the top section eventually work is way off to the side where there is little to no resistance in that direction? Instead of following this rule, the top section decided to instead plow it's way through hundreds of feet of cold steel joints and concrete.
What pancake theory describes is how if I tossed my 5 year old up in the air and tried to catch him I would be reduced to a pile of bones with my flesh and skin turned to dust.
Maybe I read your example wrong but isn't your example of a board laying across bricks excluding the central columns?
LOL I honestly couldn't tell if your backing up the official claim or arguing it. 1&2 sounded like you believe the Discovery Channels bubble-gum explanation using pancake theory but in #7 it sounds like you believe the building had some help coming down.
And in your post you prove you don't understand pancake theory. It's to do with loading. If the next set of columns can't support the load they'll give way. And so on and so on. In structures that's called progressive collapse. What you tried to describe with your five year old is only applicable if all joints in your body can't resist the load placed on them. They'd fail.
The path of least resistance is actually vertically downward. Steel loses 50% of its strength at 550c, 90% at 800c. Jet A-1 burns at roughly 1000c. Heck, a candle can be over 750c. The steel doesn't need to melt, that point is much further up the scale, it just needs to lose its load bearing capacity. That's day one in a structures classroom. It's a testament to the architects and engineers that the building survived that long.
The steel below the affected floors was cold. 50% strength when heated is moot. The steel was cold below the impact. The structure below the impact has been holding the rest up for decades and was not affected by the collision. If supports from the section above were removed in instant the force slamming down on the bottom would be much greater than it's dry weight. I get that. But that would require the heat to be spread perfectly even across all joints in order to achieve a perfect snap.
The condition your describing would cause a lot of twisting and buckling before it all let go. Film crews on the ground would pick up the audio from that since it would be mostly high frequency sounds. You didn't hear anything did you? It would be quite obvious. New Jersey would have heard the creeking and twisting.
What you describe did not happen. The floor went "poof" in an instant.
originally posted by: MALBOSIA
a reply to: AnteBellum
EVERY SINGLE LOW LEVEL COLUMN WOULD HAVE HAD TO FAIL AT THE EXACT SAME TIME FOR IT TO FALL WITHOUT BANKING IN ONE DIRECTION OR ANOTHER.
If you believe that about #7, why not #1 & #2? The construction was different but the same principle would apply. #1 & 2 came down perfectly straight and uniform. I don't compare it to a demolition, it just looks like it was blown up from just below the impact. Heavy explosives would only need to be place every 10 floors or so to keep the speed of collapse that we say.
There was never a witness to say it sounded like a steel structure was failing. All the witnesses ever said was that they heard explosions.
originally posted by: AnteBellum
a reply to: Blue_Jay33
The help was the shearing effect of floors above pulling down as the weight above pulled those down. Almost like pealing a banana if the skin was attached to the edible part, it would rip the fruit out with it. Due to gravity and tons of debris it all just got shredded in downward fashion.
But again I think the conspiracy is still valid regardless, Building 7 did not fall by itself and if that part isn't true, someone has some explaining to do.
Hopefully we won't have to see this happen again to fully understand the truth.
originally posted by: AnteBellum
a reply to: scottyirnbru
Why don't you read the previous posts I wrote and then watch demolitions of all different types, on different structures, specifically tall buildings. Pay especially close attention learning what all the demolition crews are trying to prevent and ultimately gets paid big bucks for doing it correctly. Then try to make the same conclusion.
A.) If the building fell from damage it would have fallen partially and from the top down or from the section that received damage. Also it would have shifted to the one or more side(s) quite a bit more.
B.) There were 3 main central core support systems, they failed at the same time. Then all the perimeter support columns failed at the same time also - at ground level. The building went straight down - the entire thing. If it was a partial, facade or 'cave-in' I would change my mind, but it wasn't.
C.) If you were standing at the top floor looking out a window you would have watched(alive) the entire building fall down. The building collapsed top-down, not like a building that collapses from weight or damage(just look at the difference in the way the TT's fell). Someone pulled the legs out from under this building at all critical points at the same time. Play the lottery much?
originally posted by: devilhunter69
Always wondered why a single photo has never been released of the Pentagon plane before it hit. That security video is an embarrassment.
To me thats the most damning evidence that the official 9/11 story has serious 'issues'