RE: "No, currently the physics says there must of been explosives on every floor."
I'd say that's unlikely. The best lies have a hint of truth to them, and the pancake theory works if you demolish sections of the core ahead of the collapse progression.
The pancake theory is heat caused floor trusses to distort and shear off from their anchors on the perimeter columns, then the weight of the buildings caused the progressive collapse by the continuation of the shearing effect of the anchors all the way down. We know that isn't possible because of the way the central core was constructed.
Standard demolition theory is to cut interior supports ahead of the collapse progression. In the case of the twin towers, the weight of the collapse would strike the severed core, which would cause the truss anchors to shear off from the perimeter columns - allowing the floors to pancake.
IMO, the whole concrete dust speculation is a red herring. The concrete in the floors of the buildings was not structural, but a light weight mix that basically just provided a cheap and easy way to make flat floor surfaces. It was not the 3000 psi, 5 bag mix stuff used for load bearing foundations. I've never worked with it personally, but I assume it would give you something along the lines of pumice that would be fairly light and crumbly. I doubt it'd take much to turn it to powder as it was only designed to support the weight of desks and people walking across it. Between the drywall and light weight concrete, I don't think it's too hard to account for the dust, or even the fineness of the dust.
What's interesting about the dust is the way it was blown up and outward. That would also be consistent with charges being detonated below the collapse progression, as the pressure waves take the path of least resistance through the open tops of the elevator shafts, pushing the lighter debris and dust ahead of them.
Try some Internet searches on controlled demolitions to pick up some background information on how they're done. The more you learn, the more obvious it becomes on exactly how the towers were brought down. The basic theory is to use as little explosive as possible and let gravity do most of the work for you. There's no need to blow every floor to kingdom come when all that's needed is to chop out a few key load bearing areas.
For all the computer models floating around, it's kind of a wonder no one has built one to predict where and how the charges were placed to accomplish the observed results. For example; 5 pounds of C-4 per central column every 15 floors, or 220 pounds per floor at 7 locations, for a total of around 1500 pounds per building. You could put enough for one floor on a hand truck, and would likely have complete access to the core, out of public view, through various service doors.
You might have to go off shore to find a demolition engineer willing to design the implosion model, but I don't think it'd be that hard to do. |
