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re: Explain what caused the towers to collspse.

Posted on 9/12/22 at 3:01 pm to
Posted by Nawlens Gator
louisiana
Member since Sep 2005
5960 posts
Posted on 9/12/22 at 3:01 pm to
We test vessels at 150% of design pressure, not 300%.

This post was edited on 9/12/22 at 3:18 pm
Posted by Nurbis
Member since May 2020
2373 posts
Posted on 9/12/22 at 3:13 pm to
quote:

you are the one asking my opinion, which would be emotionally based


None of the information people have provided in response to your questions has been good enough so far. So why don't you explain to us in detail why the towers collapsed?
Posted by Indefatigable
Member since Jan 2019
37202 posts
Posted on 9/12/22 at 3:13 pm to
quote:

an opinion is not scientific facts

Who said it was? I am asking your opinion.

Your refusal to give it displays an exceptional level of either self-doubt or cognitive disability.
Posted by Indefatigable
Member since Jan 2019
37202 posts
Posted on 9/12/22 at 3:14 pm to
quote:

So why don't you explain to us in detail why the towers collapsed?

Hell, I am just asking whether he thinks that airplanes hit them or not.

And he still won't answer
Posted by bstew3006
318
Member since Dec 2007
13049 posts
Posted on 9/12/22 at 3:19 pm to
quote:

WTC 7 fell because it was demolished on purpose.


7 started burning from debris after both planes hit twin towers. Water was cut off and it burned for 9 hours. Half the building collapsed around 6pm
Posted by OU Guy
Member since Feb 2022
29669 posts
Posted on 9/12/22 at 3:33 pm to
Wow, many posters have answered yet you continue on

Heres a picture if you zoom in you can still see the spire falling in tandom with building even as several floors have collapsed.

Your conspiracy makes a mockery of the victims. The fire was so hot many people jumped to death rather than burn up.

Posted by bstew3006
318
Member since Dec 2007
13049 posts
Posted on 9/12/22 at 3:40 pm to
quote:

that NONE of the "truths" are the truth we have been lied to over and over


Lol you’re saying engines from planes weren’t found…when you deny 767 airliners flew into the towers, you lose any argument on 9/11.
Posted by T Lasso
Member since Aug 2021
506 posts
Posted on 9/12/22 at 4:04 pm to
Prolly an airplane hitting the building

And the weight of an airplane in the building
Posted by jp4lsu
Member since Sep 2016
6750 posts
Posted on 9/12/22 at 4:16 pm to
quote:

"In an article in the Journal of the Minerals, Metals, and Materials Society and in subsequent interviews, Thomas Eagar, an engineering professor at the Massachusetts Institute of Technology, explains why: steel loses 50 percent of its strength at 1,200 degrees F; 90,000 liters of jet fuel ignited other combustible materials such as rugs, curtains, furniture and paper, which continued burning after the jet fuel was exhausted, raising temperatures above 1,400 degrees F and spreading the inferno throughout each building. Temperature differentials of hundreds of degrees across single steel horizontal trusses caused them to sag--straining and then breaking the angle clips that held the beams to the vertical columns. Once one truss failed, others followed. When one floor collapsed onto the next floor below, that floor subsequently gave way, creating a pancaking effect that triggered each 500,000-ton structure to crumble. Conspiricists argue that the buildings should have fallen over on their sides, but with 95 percent of each building consisting of air, they could only have collapsed straight down."


This is the answer. I'm an airframe stress analyst. I had a structural class the afternoon of 9/11. This is all we discussed in class. It was evident to us students that the heat was the cause of the collapse.

IIRC, the main structure is at the center and floors are cantilevered from the interior vertical beams. The attachment of the floors to the vertical beams is your weak point. Your maximum moment or bending load happens here. You weaken that and it fails, the pancaking will begin.
This post was edited on 9/12/22 at 4:23 pm
Posted by Tall Tiger
Golden Rectangle
Member since Sep 2007
4262 posts
Posted on 9/12/22 at 4:19 pm to
I went to the 9/11 museum where they have a twisted piece of the structural steel on a floor display. You can touch it, and you get a tangible feel for its immense weight and size, even though it was just one very small part of the overall structure. A couple of floors' worth of that steel coming down is enough to bring any building down and turn anything below it into dust. That's why they didn't find any bodies or office furniture after the collapse, just twisted metal and dust.
Posted by AUHighPlainsDrifter
South Carolina
Member since Sep 2017
3243 posts
Posted on 9/12/22 at 4:23 pm to
You should concentrate on not falling off the end of the flat earth and stop worrying about stuff that happened 21 years ago.
Posted by jp4lsu
Member since Sep 2016
6750 posts
Posted on 9/12/22 at 4:28 pm to
Another thing is that it is not one floor giving and pancaking to the next floor. It is the weight of every floor above it and coming down onto the next floor down.
This is not hard to understand.

I guess somebody is proposing a controlled demolition, if that was the case, to damage a vertical beam or damage the floor beams enough to cause the pancaking, you would've had a massive instantaneous blast that would've caused a shockwave and blast coming out the sides of the building.
Posted by DarkDrifter
Louisiana
Member since Aug 2011
5694 posts
Posted on 9/12/22 at 4:42 pm to
quote:

I guess somebody is proposing a controlled demolition


That's exactly what these wingnuts are eluding to..
Posted by omegaman66
greenwell springs
Member since Oct 2007
27159 posts
Posted on 9/12/22 at 4:42 pm to
"pull it"
Posted by SlimTigerSlap
Member since Apr 2022
4313 posts
Posted on 9/12/22 at 4:44 pm to
quote:


and most structures, and pressure vessels are built with a minimum of 300% safety factor

so, at 50% reduction you are down to 250% SF


Wow!! I'm in shock.
Posted by dr
texas
Member since Mar 2022
1321 posts
Posted on 9/12/22 at 4:45 pm to
quote:

Beams began to super heat from burning jet fuel and when combined with pressure lost structural integrity.


what pressure?

force of impact?
Posted by FutureMikeVIII
Houston
Member since Sep 2011
1761 posts
Posted on 9/12/22 at 4:47 pm to
quote:

what pressure?


Oh I don’t know, the weight of a fricking skyscraper
Posted by dr
texas
Member since Mar 2022
1321 posts
Posted on 9/12/22 at 4:48 pm to
that means you build a quality product


materials and testing has come a long way since the towers were built
Posted by bstew3006
318
Member since Dec 2007
13049 posts
Posted on 9/12/22 at 4:58 pm to
quote:

Another thing is that it is not one floor giving and pancaking to the next floor. It is the weight of every floor above it and coming down onto the next floor down. This is not hard to understand.


This is what they can’t grasp. When the beams / truss’ gave at the impact zone…20+ floors above impact zone fell at once…creating the pancake.
Posted by SlimTigerSlap
Member since Apr 2022
4313 posts
Posted on 9/12/22 at 4:58 pm to
quote:

quote:

and most structures, and pressure vessels are built with a minimum of 300% safety factor

so, at 50% reduction you are down to 250% SF


Wow!! I'm in shock.

Man walks into discount store with $2.50 in his pocket.

Man discovers his favorite $5 movie has a large 50% off sticker on the cover.

Man leaves store disappointed. He wishes he had $4.50.
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