(Part1) 911 Simple Physics Structural Failure Vs Demolition

(Part 2): http://www.youtube.com/watch?v=ecmQegzMJQE

The mathematical formulas used here are not the proper way for obtaining a real figure but they are based on assumptions in order to obtain a value fore the absolute minimum time needed for the collapse process.

the Assumptions are:
* That the intact structure below the impact zone will not arrest the falling structure above it and will allow it to continue the collapse.

* That the intact structure below the impact zone will behave like a fluid allowing the falling structure above it to flow through it but only providing it with an average resistance force equal to the weight above the crumbling zone at any instant... (this is a reasonable assumption because the structure is designed to support the static load of the weight above it at any point throughout the length of the building so it will provide at least that force before it gives up or breaks)
obviosly the real resistance force from the intact structure below will be alot more until it passes the elastic region and the plastic deformation then fructure but this calculation can give us the absolute minimum time needed.

The proper way to do this is to use strain energy methods and you will find that the collapse will be arrested and not allowed to continue.

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[shorty40merza]

@ryannewman4life1 pancake is a more sophesticated word than the phrase " you might as call yourself"

[itzahazylife]

Once all the weight above the impact zone drops down nothing will stop it. More bolts will pop, and more steel will snap and more and more weight will keep being added to the chain reaction. When both the towers first started collapsing, they both leaned in the direction where the perimeter columns were bowing due to heat warp. They kept on bowing more and more as the fire went on. This is visible in pics and videos. When they finally gave out, the building temporaily leaned, and then went down.

[sjonzor]

@itzahazylife

it defies physics, do some logical thinking yourself

[itzahazylife]

@briantotse3

Do people even read my comments? I explained this already. You need to understand how structures stand. This video is very misleading. Each floor only holds the vertical load of the floor above it. Once all of the weight of the building above the impact zone finally drops down when the heated steel fails, nothing is stopping it since each floor is only able to hold the floor above it.

[itzahazylife]

@sjonzor

The "bowing theory" is supported by NIST. The National Institute of Standards and Technology. I wonder if their physicists know anything about physics? Hmmm

[itzahazylife]

@sjonzor

I love how you fucking people criticize comments on youtube without any details to back up your criticism. Where the trusses bolt to the perimeter and core columns is where the vertical load of the floor above is held. Each floor only holds the weight of the floor above it. So, when the steel finally failed at the impact zone and everything above the impact zone dropped down, what do YOU supposed could have stopped it?

[sjonzor]

@itzahazylife

study physics before u spout this nonsense

[briantotse3]

@itzahazylife

So you think that a fire affecting some of the top floors weakened the steel beams from top to bottom enough to cause them to collapse?

[Killerkolt88]

Very nice video

[itzahazylife]

And the fact that the WTC's columns weren't reinforced with concrete helped even more to cause the collapse.

[itzahazylife]

This video adheres to a common misconception. It's as follows: Since there is more steel below where the impact zone is then above, the top part dropping down shouldn't have been able to collapse the lower section of the building into its own footprint. The problem with this is that each floor is only designed to carry the weight of the floor above it. So, once all of the weight of the tower above the impact zone dropped down, nothing was stopping the chain reaction.