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The design displacement of an isolation system is

  • A.the vertical settlement of the bearings under the weight of the building
  • B.the drift permitted between two successive storeys of the superstructure
  • C.the distance the building is set back from its site boundary line
  • D.the displacement the bearings must accommodate under design shaking

Answer: D

It is read from the spectrum at the isolated period, allowing for the effective damping of the system, and it governs the size of the bearings and of the surrounding gap. Values of two to four hundred millimetres are common for a building on a strong-motion site.

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