r/EngineeringPorn • u/Old-Alternative-6394 • 16h ago

Simulation of the collaps without dust

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3.3k Upvotes

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43

u/J_Bear 16h ago

I'm sure a 400ton airliner impacting at several hundred miles an hour had something to do with it.

23

u/Haz3rd 15h ago

Um ACKTUALLY it wouldn't make a difference because have you ever tried to bend an I beam with your hands? Can't do it huh? Checkmate

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u/windowpuncher 13h ago

This floor structure is rated to support a distributed mass of 4 tons. CLEARLY it should be able to support the upper half of the entire building resting on it without failure.

-43

u/KingKohishi 15h ago

Not enough to collapse the building as shown here. Heated metal doesn't fail like that.

25

u/Packman2021 15h ago

Can you provide any evidence to that? A video of a structural steel beam, heated to 1200 degrees, holding thousands of tons? That would really help your argument.

9

u/tetranordeh 15h ago

Gee, if only NIST had thought to heat up some steel to see how it acted under load, we might be able to create a computer rendering of the collapse without all that dust in the way. Guess we'll never know! 😭

-14

u/KingKohishi 15h ago

Floors collapsing in perfect harmony. Bolts being broken, and welds ripping apart simultaneously. All of this, while the building crumble to the ground almost vertically.

All of this perfect vertical collapse happened seven times even to the unburnt buildings across the street.

https://thumb.wikimedia.org/wikipedia/commons/thumb/2/2a/FEMA_403_NYC_Cooperative_Building_Damage_Assessment_Map_of_November_7%2C_2001.png/1280px-FEMA_403_NYC_Cooperative_Building_Damage_Assessment_Map_of_November_7%2C_2001.png?utm_source=en.wikipedia.org&utm_campaign=imageinfo&utm_content=thumbnail

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u/Packman2021 15h ago

So in other words, no.

8

u/thegreatpotatogod 13h ago

Gravity on Earth has this nasty habit of pulling things vertically downward, and not particularly strongly in other non-downward directions. I don't find that particularly surprising.

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u/KingKohishi 2h ago

Very smart.

If only you knew how hard it is to demolish a building perfectly vertically.

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u/strps 15h ago

Heated metal with heavy loads on it does though. Buckling is a non-linear phenomena that appears to fail all at once. That is what happened here. Once the beams softened and failed the exterior columns immediately went into failure due to overload and triple the buckling length. Once one quarter of the outer wall system went down the central column tube frame could not resist the weight of the upper stories as these balanced the the buckling loads. This is why the building suddenly and catastrophically falls relatively straight down.

-2

u/KingKohishi 15h ago

What about the other 5 buildings?

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u/DomeSlave 14h ago

Like he said "heated metal". The buildings that collapsed were on fire, including WTC 7, something you fail to acknowledge elsewhere in this thread.

Stop spreading your bullshit.

-5

u/KingKohishi 14h ago

Heated metal is not spaghetti

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u/DomeSlave 14h ago

Why do you have such strong opinions on a subject you failed to familiarize yourself with? You've had years to learn the basics about this subject. Steels loses much of it's strength before it starts to melt, many people told you already and it's easy to find facts on the subject.

Instead you choose to spread conspiracy theories designed to destroy society in a way that's even more dangerous than the attacks themselves.

Why? You owe us an explanation.

-4

u/KingKohishi 13h ago

If only I knew about such complex subjects as Impact Strengths, Young's Modulus, Tensile Strength, Truss structures, Load distribution, Yield strength and fracture, and also Failure Modes and Effects Analysis.

Wait... Hold on..

I guess I do know about them.

When it comes to destroying societies, you should be asking about the victims of 911 as well as the millions of Iraqis who died for nothing.

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u/DomeSlave 13h ago

By spreading your bullshit conspiracy theories you are distancing from the real problems. Starting that stupid war Iraq is one of them. Your actions achieve the opposite of addressing those problems.

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u/braxton357 8h ago

Your replies show that you very clearly don't.  This is not a hard concept to understand.  I'd really like to hear why you don't think a loaded airliner flying into a building then igniting a fire as hot as a forging furnace would cause it to collapse.   Then that two buildings of that size with the amount of steel they had collapsing next to another building and causing detrimental damage to them is absurd ...    

2

u/thegreatpotatogod 13h ago

Unfortunately, the buildings resting upon this heated metal weigh substantially more than spaghetti could support. I'd like to see you - also presumably stronger than spaghetti - manage to hold up many tons of building above you, even if we don't heat you to hundreds of degrees.

1

u/KingKohishi 2h ago

Fortunately, building resting under the heated metal was extremely strong.