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The performance level described as collapse prevention means

  • A.the structure is undamaged and fully serviceable throughout
  • B.the structure has collapsed in a controlled and predictable manner
  • C.no analysis of the structure has been carried out at all
  • D.the structure stands but is on the verge of losing stability

Answer: D

At this level the building has very little margin left and may not be repairable, but it has not come down and the occupants have survived. It is the objective normally paired with the rarest and most severe level of shaking considered.

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