Continued from here:
if you can open it!
In our last episode... I had asked for an example of something crushing through a larger something of the same material and density via gravity alone other than the Twin Towers. The NIST/Bazant hypothesis describes an upper block of storeys that "crushes down" through the larger intact building then gets "crushed up" by the pile of rubble (never mind that it has been crushing against this pile of rubble throughout the collapse) at the end, all in the space of 13 seconds:
The Twin Towers were constructed with 240 perimeter structural steel box columns and 47 larger core box columns, ranging from 36" x 16" to 52" x 22", forming a dense core structure which, alone, comprised 25% of the total area in the buildings' horizontal span.
Pants' answer to my question was that a house of cards is an example of a small structure crushing through a larger structure of the same material. I pointed out to him several times that a house of cards topples, rather than crushes down. Pants' eventual reply to that was to suggest that Bazant doesn't "really mean" crush-down, and that crush-down includes many different events occurring.
That "crush-down" includes many different events is not disputed. It still amounts to a disappearance of 80 and 90 floors of concrete and structural steel, whether this occurred through crushing, through pulverization, or through some columns buckling or falling out.
In crushing, columns would buckle and fall out, would they not? Otherwise what would they be doing? So the semantic game of tricks here is not appropriate. Bazant clearly uses the terms "crush down" and "crush up".