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>> well, it is, but it doesn't explain anything, really, because the fact is what we see here is what engineers consider classic example of punching failure, in which the concrete just punched through the slab. you build the column through the bottom of the slab, then you pour the concrete slab and continue the next area. so the slab continues across the column. it shouldn't break the way you see here. this is a punching failure, and the rebar, the steel bars, are supposed to prevent that or at least presume resistance of that. but the oddity here is that a structural engineer could do a quick calculation of this, and he would find that even without any reinforcing bars going through the slab in that location, this really should not have failed the way it did. so something else is wrong. now, certainly without the bars,