Wtc 7 Leaning Against Verizon Building, cut column with molten slag Options

[Paul]

Hi found this photo of the wall columns of wtc 7 leaning against the verizon building where it landed as wtc 7 fell at freefall speed and leaned
back just hitting the verizon building causing some structural damage to the other building as it fell now look at the cut column with the molten
metal iron slag covering part of the top of the building as it fell, i dont know whether this is demolition cut by as thermite demolition charge because
of the molten metal that was produced when it was cut ot whether it is part of a clean up cut, what kind of torch used for cutting steel would produce
so much heat that it would leave messy iron slag dripping down the top of the column where it was cut if it was done by a clean up crew?
The funny thing i dont understand about all of this is if you look at the column which have been cut by clean up crews at ground zero and even
the columns that where cut up after they where removed is that none of them except for one of them a core columsn at ground zero appear to have
and molten metal slag where they where cut during the clean up process, so what kind of torch would leave such a messy cut? And would they use such a torch to make this kind of cut? I am interested to hear what you all have to say about this piece.

(IMG:http://img710.imageshack.us/img710/3769/37debrisofwtc7againstve.jpg)

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http://img710.imageshack.us/i/37debrisofwtc7againstve.jpg/

Cheers Paul S

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[SanderO]

DanDPT

You are correct that the cores of WTC 1 and 2 could stand without the outside floors or the facade. The facade structure however was part of the wind shear strategy so the core might stand with no walls just a bare frame. If there was no floors outside and no facade AND the core was clad with "walls" it would not be able to resist wind shear.

Also the facade could NOT stand alone without the floors. The facade, strong as it may have been required lateral bracing which was provided by the floor system. And the floor system transferred wind loads through it to the stiff core. If it were possible to erect the facade only as a huge tube it would not survive a minute after the scaffold was removed.

[DANDPT]

DanDPT

You are correct that the cores of WTC 1 and 2 could stand without the outside floors or the facade. The facade structure however was part of the wind shear strategy so the core might stand with no walls just a bare frame. If there was no floors outside and no facade AND the core was clad with "walls" it would not be able to resist wind shear.

Also the facade could NOT stand alone without the floors. The facade, strong as it may have been required lateral bracing which was provided by the floor system. And the floor system transferred wind loads through it to the stiff core. If it were possible to erect the facade only as a huge tube it would not survive a minute after the scaffold was removed.

SanderO
I understand what you are saying. I was trying to indicate that the outer perimeter column structure was a separate type of construction and that the demolition of this huge tube was approached differently and separately from the much more robust inner column structure. However, I don't think that the perimeter structure would collapse in a minute, if conceived as standing on it's own. It would stand like a tall straw until overcome by wind shear or other forces. Conceived on it's own, it's a pretty rigid, and very tall , square tube. This point is kind of tangential to the main issues that I was trying to raise about the method of demolition of these perimeter columns. Please reread my post.
Thanks,
DAN