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Compared with an equivalent fixed-base building, a base-isolated building generally has

  • A.larger floor accelerations and larger interstorey drifts
  • B.smaller floor accelerations but very much larger interstorey drifts than before
  • C.the same accelerations and drifts as before isolation
  • D.smaller floor accelerations and much smaller interstorey drifts

Answer: D

The superstructure moves almost as a rigid body on top of the isolation layer, so the storeys deform very little relative to one another and the contents feel much less shaking. Nearly all of the displacement is concentrated in the bearings instead.

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