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re: Explain what caused the towers to collspse.
Posted on 9/11/22 at 9:45 pm to flyingtexastiger
Posted on 9/11/22 at 9:45 pm to flyingtexastiger
quote:
Get an Engineer in here to explain to you the stresses placed on the structure of a modern skyscraper is and what is the ultimate failure load when a 400 mph airliner takes out much of the structural strength of the building.
Many claim the same as what I'm saying so...
0
Posted on 9/11/22 at 9:46 pm to Bayoutigre
Posted on 9/11/22 at 9:46 pm to Errerrerrwere
quote:
Again, none of it gets you to the temperature needed to melt stee
The temp was +1000 degrees. That temp doesn’t “melt” steel, but it can be bent at that temp.
You had the fire resistant material being blown off, stress/load the steel was already under…yes it will fail.
Posted on 9/11/22 at 9:46 pm to Errerrerrwere
quote:
How hot does steel need to be to weaken?
No idea but I have seen buildings with steel trusses burn and the trusses turn into noodles. Also seen building with wooden beams burn and char the outside of the wood but they still held and the steel beams attached to them collapsed.
Posted on 9/11/22 at 9:48 pm to Errerrerrwere
I have never understood how this controlled demolition was installed and no one noticed. And how many people would it have taken to install an operation of that size. Not only did no one notice, none of the hundreds of contractors it would have taken have written one sentence about it on Twitter.
Posted on 9/11/22 at 9:48 pm to highcotton2
quote:
No idea but I have seen buildings with steel trusses burn and the trusses turn into noodles. Also seen building with wooden beams burn and char the outside of the wood but they still held and the steel beams attached to them collapsed.
Which ones? Because all of a sudden these two engineering marvels went down in minutes...
Posted on 9/11/22 at 9:48 pm to AtticusOSullivan
Physics. The metal frame disintegrated as a result of the extreme heat from the flames, leading to "pancaking" of floors on top of each other in a cascading effect.
Posted on 9/11/22 at 9:49 pm to tarzana
And it all landed perfectly
Posted on 9/11/22 at 9:49 pm to WAY2GOLSU
quote:
I have never understood how this controlled demolition was installed and no one noticed. And how many people would it have taken to install an operation of that size. Not only did no one notice, none of the hundreds of contractors it would have taken have written one sentence about it on Twitter.
You’d think 21 years from the event, there would have been a death bed confession or two by now.
Posted on 9/11/22 at 9:50 pm to Errerrerrwere
quote:
Matters so. We still haven't got to the temperature that would cause this to fall. Been asking but noone wants to answer.
Yes the closed environment of the structure raised temperatures high enough to weaken the structure.
quote:
The only two steel beam buildings to ever go down in the history of the world.
I doubt that. But what does that have to do with anything? I would propose these were the only two steel structures every hit by modern jet aircraft fully loaded with fuel.
quote:
What happened next?
The buildings collapsed under their own weight.
quote:
Well, the good ole US of A went to war for the next 20 years.
If you want to argue the powers that be took advantage of this event to spool up the war machine and enrich the MIC, I'm with you.
If you are proposing the event was by design, you've lost me.
Posted on 9/11/22 at 9:51 pm to Errerrerrwere
quote:
How hot does steel need to be to weaken?
Steel looses 50% of its structural integrity at 1100 degrees... Jet fuel can burn at 1500..
Posted on 9/11/22 at 9:52 pm to Errerrerrwere
quote:
And it all landed perfectly
Actually it spread across a few blocks and crushed people hundreds of yards away.
Posted on 9/11/22 at 9:52 pm to WAY2GOLSU
quote:
have never understood how this controlled demolition was installed and no one noticed. And how many people would it have taken to install an operation of that size. Not only did no one notice, none of the hundreds of contractors it would have taken have written one sentence about it on Twitter.
This!
Posted on 9/11/22 at 9:53 pm to Errerrerrwere
quote:
Which ones? Because all of a sudden these two engineering marvels went down in minutes...
Pretty sure it was hours not minutes.
Posted on 9/11/22 at 9:53 pm to AtticusOSullivan
Steel will not melt until it reaches 2,750 degrees but just like anything which melts, it loses strength at temperatures far lower than its melting point (melting is the ultimate expression of something weakening).
As long as steel does not get heated to over 720 degrees, it will retain around 100% of its strength. At 1,100 degrees, steel loses about 50% of its strength. Jet fuel burns at anywhere from 800 to 1,500 degrees, so even at its minimum temperature it would weaken steel. The planes had just taken off so they were loaded with fuel.
Now add the massive structural damage of a hole ripped through multiple floors and draft winds ensuring temperatures far higher than the minimum and you have a recipe for weakening structural supports. Once a couple of the remaining structural supports weakened enough, the entire weight above the wreckage comes crashing down. Fifteen and twenty-five stories worth of steel and concrete falling downward creates far more downward force than the structures were ever designed to hold up.
As long as steel does not get heated to over 720 degrees, it will retain around 100% of its strength. At 1,100 degrees, steel loses about 50% of its strength. Jet fuel burns at anywhere from 800 to 1,500 degrees, so even at its minimum temperature it would weaken steel. The planes had just taken off so they were loaded with fuel.
Now add the massive structural damage of a hole ripped through multiple floors and draft winds ensuring temperatures far higher than the minimum and you have a recipe for weakening structural supports. Once a couple of the remaining structural supports weakened enough, the entire weight above the wreckage comes crashing down. Fifteen and twenty-five stories worth of steel and concrete falling downward creates far more downward force than the structures were ever designed to hold up.
Posted on 9/11/22 at 9:54 pm to Bayoutigre
one of Bush`s sons was involved in the wiring of the buildings his security co.had contract to wire it.marvin bush
Posted on 9/11/22 at 9:54 pm to AndyCBR
Dust clouds did yes.
The concrete and steel didn't spread over blocks
The concrete and steel didn't spread over blocks
Posted on 9/11/22 at 9:57 pm to DarkDrifter
even if steel got hot enough it would fall over,not collapse into its own footprint at freefall speed on top of all the floors below
Posted on 9/11/22 at 9:59 pm to Bayoutigre
quote:
even if steel got hot enough it would fall over,not collapse into its own footprint at freefall speed on top of all the floors below
Says who?
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