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A base-isolated building on a near-fault site needs particular care because

  • A.the isolators cannot carry vertical load close to an active fault line
  • B.such sites are always underlain by rock rather than by soil deposits
  • C.a long-period velocity pulse can drive very large displacements
  • D.near-fault sites have unusually short predominant periods of motion

Answer: C

A single strong pulse in the two to three second range is exactly what an isolated building is tuned to, and the bearings may be driven to or past their capacity. Larger gaps, more damping or displacement restraints are used to deal with it.

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