With cardboard boxes, wire mesh, popsicle sticks, plastic boxes, whatever. Shape it into two scale boxes in the proportions of the lower half and upper portion of the trade center at the point of impact. Then you can drop the top box onto the bottom from a distance even greater than the proportional drop of the building and it will not crush the material. Hell you can even use folded paper boxes. It doesn't matter the weight or material, the proportion of top to bottom mass is the same whether its paper or the tallest building in the world. So you can build a model with practically anything that will hold the weight of the box above, but an engineer can't design a building to to do the same thing?
As the force came down on the floor below the that floor would try to resist the load. The bulding is designed for an enormous live load in the event that every floor was packed with people and equipment. It would have provided some resistance and even if it failed it would have slowed the fall. This would occur at every single floor.This would have prevented freefall speed from occuring.
The only way columns would have to "catch" all the above weight is if every single structural column failed at the exact same moment. Fires spread, and even if we assume the temps of the jetfuel were high enough to melt steel, which it should not have been, then a fire would melt different columns as it spread. So you would get a progressive column failure from a fire. This would result in an initial collapse in only the areas that failed first, and would cause a lean to the upper area which should have sent it toppling over rather than straight down through the floors below.
Want DP delivered to your inbox daily? Subscribe here: