Contrary to some CT claims, the outer columns of WTC 7 that are visible in debris photos do not show signs of being sheared by explosives.
Now, how were those columns joined to make long vertical columns?
"Typical core column splices were shown on available erection drawings. The adjoining surfaces of columns were specified to be milled. The splice plates were welded to or bolted to the outsides of the column web and flanges. ...Perimeter column splices were similar to the core column splices." http://tinyurl.com/rmbsj
Here’s what was seen in building 7’s rubble pile:
The columns separated at their splices. There's nothing nefarious or mysterious going on here.