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.

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Cheers Paul S

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[SanderO]

Pre weakening is often part of a commercial CD. It basically begins the process of load transfer by disabling some structural connections of leaving that close to the breaking point (yield point) so it takes much less stress to fail that connection. If the there was significant pre weakening we should see lots of clear evidence of this in the debris field. In the case of the facade columns this would mean neatly removed column to column bolts. This would look like as if there was no cutting or blasting of the column ends. But if they facade panels bent at the joints as they fell away from the towers this might cause the bolt heads to shear off and this would look the same in the debris as unbolted connections. So while they MIGHT have unbolted thousands and thousands of facade column to column bolts if they buckled at the joints and sheared the bolts it would look the same... can't tell from the debris.

On the other hand lots of deformed column ends or beam studs connecting bracing or as shown in the photo lots of evidence of cuts from cutter devices or incendiaries in the debris, this would be pretty damning evidence of pre weakening before collapse.

There are some very peculiar pieces of steel in the debris. The wasted away thin webs and flanges attributed to "eutectic" burning and a few collapse box column ends which appear to be from blasts and some extreme bent columns such as the horse shoe columns which are evidence of heat weakend steel and enormous eccentric loading (buckling?) while the ends were restrained.

It appears that the virtually all the debris steel looks like a came apart in the collapse, broken cleanly at the connections. But this is not true of all the steel and so some very energetic actions appears to have caused at least some steel failures. I haven't seen evidence of this sort on weakening in the heavy lower core columns.

However, all the steel was not examined and almost all of it was hauled away and sold as scrap so we don't have much to work with evidence wise.