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Columns can't do what?

To add to the confusion, it appears to me that this column sheared off from a welded joint, leaving part of the bead on the surface to which it was welded, and taking another part of the bead with it. The retained bead is on the narrow side of the box, toward the camera. The eye would have some tendancy to see that as an angled cut.

On the up side, it would argue against the use of explosives, in that explosives would ahve at least slightly deformed the lip around the cut.
 
The columns were in sections, bolted and welded together. Under stress, those joins failed, letting the columns break into their component sections. The NIST report has ample close up photographs of core columns that failed cleanly at their joins, as well as exterior columns that did the same, and floor truss mounting plates (on the inside of the exterior panels) that were sheared off cleanly.

-Gumboot
 
I believe that the column on the left in this picture is the column in question. If so, then I think it proves Minidin is absolutely correct.



 
Twoofer sits in basement and spots the key to the whole collapse yet the investigators and iron workers missed it. [shakes head] Morons!
 
Minadin said:
That's not a diagonal cut, IMO. It's a rectangular section of steel that is leaning toward the camera, and the perspective / foreshortening creates the illusion of a diagonal end.
Click to expand...

absolutely.

There are pictures of some steel columns that were obviously cut, and diagonally, but the photos I have seen show columns that easily could have been cut with torches in the rescue and or demo efforts.

TAM:)
 
I have a Master in Mechanical Engineering. Beams can quite easily fail in a diagonal shear mode depending on the state of loading.

One needs to construct a Mohr's circle using the known loads of the beam. These may include tension/compression, bending moments and twisting moments.

Failure will typically occur at the principal stress axes which are rarely directly perpandicular to the axis of the beam due to the complex loading conditions.

This is basic Mechanics of Materials stuff that any sophomore ME or CE can tell you.

Lurker

ETA: This assumes the beam fails and not the joint itself as posited by earlier posters.
 
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To be fair to Totovader, he did state that it was his view that the column was a leaner in the OP, and I was just agreeing with him. I think it's an important thing to reiterate because conspiracy theorists often fail to recognize the limitations inherent in the types of evidence they rely on, in this case, a 2-D photo.

I know that we've all seen this photograph used as evidence of thermite:

1253246e953510c564.jpg


But, I have suspected that it was experiencing the same sort of foreshortening as the column in the image in the OP. However, in the case of the above image, I will admit that due to the "slaggy" nature of the end of the column, it's certainly possible that it was cut sometime after the collapse by rescue / recovery workers with a torch. If that's the case, it would make sense to cut it at a diagonal, so that you could control the direction that the unsupported end would fall.
 
That one is deffinately cut, you can see the torch marks on the cut itself asnd the slag is on top of the rubble which means that the rubble was there first.
 
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