A W Smith
Philosopher
Now that you have stepped into the fecal matter that is explosive demolition, let me remind you that at least on the perimeter. It wasn't only the truss seats that tied the floors to the exterior column trees. There were also "V" bars that were welded to brackets on the spandrel plates between truss centers. These were embedded into the floor slab and were attached to the upper chords of the trusses. So its not so easy to disconnect the floors at least at the perimeter.