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> “I say imagine you built a 10 story building, but every few years it was a story at a time with the renovations along the way”

See the Versailles Wedding Hall collapse in Israel, 2001: https://en.wikipedia.org/wiki/Versailles_wedding_hall_disast...

""" An initial inquiry blamed the collapse on the Pal-Kal method of constructing light-weight coffered concrete floor systems which was banned shortly after …

Late in the construction process … a third storey was added. … the structure supporting the new third storey was subjected to much greater loading than was originally anticipated. … somewhat mitigated by the construction of partitions on the floor below …

A few weeks before the collapse, the wedding hall owners decided to remove the partitions. … the floor above began to sag several centimetres. The owners viewed the sagging floor primarily as a cosmetic problem, and attempted to level it with additional grout and fill … a new and significant dead load at the weakened area. """





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