re: Explain what caused the towers to collspse.

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Get me to the temperature that weakens steel I beams and we will discuss it further.

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"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."

LINK

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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.

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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."

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Not to mention, the towers were designed that way ON PURPOSE. There is a Modern Marvels on the history channel about the towers, pre 9/11. The nutjobs should check it out. Or they should consider the role Engineering plays in designing giant structures and the safe guards utilized within rather than think they know more than the engineers and the science behind the buildings.

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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.

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It was just a few burning office chairs, bruh.

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It’s structural integrity decreased by 50%. From 300% to 250%

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Can we talk about how wasteful it is to design anything over 200% factor of safety?

200% should be the max, it allows a structure to lose all (100%) of its integrity and still have 100% of its structural integrity intact!

dr has just revolutionized civil engineering.

stick end a chunk of iron in a fire,
measure temp

stick other end in water
measure temp

same fire temp less in second one

quench

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because its a discussion board

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Right. And you are refusing to discuss.

Do you think airplanes hit the WTC, Pentagon, and a field in Pennsylvania on 9/11?

Your answer directly impacts your credibility in said discussion. Refusing to answer such basic and simple questions does nothing to further discussion. Use them as a starting point. Just answer. Go ahead and say "No" so that we can discuss it.

You are the only person not discussing in this thread. You are just throwing ninth grade physics at the wall and asking questions

FYI, most of its strength was outside, in the air at 80° plus the fire

The twin towers’ design provided stability from the outside in—without a forest of interior support columns.
Traditional skyscrapers owed their stability to a system of large vertical columns running through each floor at intervals of 15-30 feet, with the exterior walls providing little support on their own. But in order to open up the vast swaths of office space called for in the planned twin towers, engineers put the bulk of the buildings’ strength outside, essentially creating stiff tubes of heavy steel. The innovative design allowed for minimal columns inside, most of them clustered at the building’s center so as to maximize the amount of open space on each floor.

hint, that is how its done

I just stated something you didn't understand

you prob, not mine

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Right. And you are refusing to discuss.

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no,

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Do you think airplanes hit the WTC, Pentagon, and a field in Pennsylvania on 9/11?

Your answer directly impacts your credibility in said discussion. Refusing to answer such basic and simple questions does nothing to further discussion. Use them as a starting point. Just answer. Go ahead and say "No" so that we can discuss it.

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no, an opinion is not scientific facts

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You are the only person not discussing in this thread. You are just throwing ninth grade physics at the wall and asking questions

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you are the one asking my opinion, which would be emotionally based
You started name calling, and the concept of heat transfer thru a massive multimaterial structure, whose strength was mainly on the outside were the steel would be coolest is not even close to ninth grade

but, you proved your point, yet again, with no facts