Here's a site I hadn't seen before that seems to have plenty of pics/photos/theories.
http://www.sharpprintinginc.com/911/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=161&MMN_position=154:154
There is apparently a case to be made for poor joint design of the core columns (butt welds, all on the same horizontal plane - right where fractures of the columns occurred).
And your theory is what, exactly? The ‘’truth’’ is heat(and gravity) bought down the Trade Center. Not explosives.
“There is apparently a case to be made for poor joint design of the core columns (butt welds, all on the same horizontal plane - right where fractures of the columns occurred).”
Those are perimeter columns, not core columns. The only locations where bolted joints were located in the same plane occurred at three different levels, called “mechanical floors.” However, at these locations the joints were also welded.
WTC1 (North Tower) Impact zone: Floors 94-97
Perimeter columns destroyed: 31-36 of 60 (240 total for all four sides)
WTC2 (South Tower) Impact zone: Floors 78-84
Perimeter columns destroyed 23 of 60 (240 columns total),
including a corner.
http://www.journalof911studies.com/volume/200703/GUrich/MassAndPeWtc.pdf
“The mechanical floors are 7-9, 41-43, 75-77, and 108-110, which are all beam framed floors. In each group of three floors, the upper and lower floors are type 12 and the middle floor is type 13 (mechanical mezzanine). The mechanical mezzanines were 50% open (no floor) outside the core so the floor area is 15,448.5 sq ft.”
So, for both WTC1 (the North Tower) and WTC2 (The South Tower) the impact zones did not include a mechanical floor. Thus at no point within the impact zone was bolting within a single plane involved.
The perimeter columns were modular assemblies grouped together in sets of three. The bolting of these units was not in the same plane but staggered. Since the perimeter steel columns were not welded, but bolted, the bolt connections would act like plastic hinges until tension stresses created by the sagging floor membranes (cantinary action) caused sheer failure.
Interesting to note that for WTC2 (South Tower) the second of the twin towers to be struck, but the first to first collapse, the 81st Floor was the first floor to fail and initiate the collapse. That floor housed 12 elevator hoists (weighing 24 tons each) that cover 1/2 the floor space.
For the idiots who choose to believe that demolition charges were involved, here is a good rebuttal to your insanity:
http://www.implosionworld.com/Article-WTC%20STUDY%208-06%20w%20clarif%20as%20of%209-8-06%20.pdf