Loose relatively slow moving separate pieces of rubble would be more analogous to many separate two x fours hitting a house, in the sense that each individual item is not capable of destroying or doing significant damage to the structure below in it's impact. The structure is capable of absorbing a huge number of these relatively benign impacts. The overall weight does not matter for a building as the lower structure is designed to handle several times the weight of the material above it, so it can never overload statically like the snow load example you used.
Thanks TS. Evidently lower part A of the structure can statically carry upper part C as per post #1. Challenge is simply, if part C can one-way crush down part A after being dropped on part A from a height h as per post #1.
The simple answer is, I repeat, it is not possible. And the reason is, I repeat, that part A decelerates and deforms the total assembly of elements of part C and locally damages elements of part C in contact with part A. As A is bigger than C, A stops C.
Evidently very strong elements coming loose of part C may damage very weak elements of part A, but how can strong elements of part C detach themselves completely from weak elements of part C?
Somebody suggested that the mast dropped first as totally 4 beam frames collapsed below the mast. But the frames carried the mast before ... and nothing dropped on the frames and the frames were not affected by heat.
Actually, a gravity force (loose mass dropping) applied on an element can either break the element in two pieces or break one connection of the element to other elements. The element does not become completely loose, only broken. To break loose an element you need two forces applied simultaneously ... and doing that by gravity is impossible. But with CD it is quite easy.
Conclusion, the only way to one way crush down A by C is to assist with CD.
It seems that should be the final post of The Heiwa Challenge thread!
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