You need to look at the visualizations of column alignment in WTC 1 with the actual measurements of the tilt and drop taken into consideration. This was done recently and can be seen at http://the911forum.freeforums.org/wtc-1-core-3d-model-t308-15.html where the link takes you to the page and you just need to scroll down to the middle of the page.
So, you've got these massive columns, bent into giant arcs by a precariously tilting upper section, most of the beams loaded well past their theoretical load carrying capacities, and all of them inflicted with huge amounts of bending moments ...
... and then something snaps ...
... and all the beams remain stationary, no whipping back to straight sections, no dynamics...?
... and the beams just ever-so-serenely pass thru each other...??
[irony]
Sure, those are COMPLETELY REALISTIC models of what happened...
[/irony]
Tom