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Progressive Collapse Examples

Outside of the cases of the 2001 WTC attack and the 1995 OKC bombing, examples of progressive collapses of steel-frames or steel-reinforced-concrete structures are rare

1987 collapse of L'Ambiance Plaza is cited as example of total progressive collapse. Unlike the WTC skyscrapers, L'Ambiance Plaza:

  • Was under construction, employing temporary structures
  • Violated design specifications
  • Left rubble with recognizable floor slabs
  • Did not produce an explosion and dust cloud on collapsing
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