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The seismic gap provided around a base-isolated building should be based on

  • A.the displacement in the maximum considered earthquake
  • B.the displacement in a small frequently occurring earthquake at that particular site
  • C.the drift limit of 0.004 times the storey height applied at the isolation plane
  • D.the vertical settlement expected in the bearings over the life of the building

Answer: A

Impact against the moat wall is a severe event for the superstructure, so the gap is sized for the rarer shaking rather than the design level. That is why the gap is normally larger than the design displacement itself.

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