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Base isolation is most attractive for a building that is

  • A.stiff, low-rise and houses valuable or sensitive contents
  • B.very tall, slender and already flexible
  • C.founded on deep soft clay whose own site period is a long one
  • D.a light single-storey shed of no particular value

Answer: A

A stiff building has a short fixed-base period, so the shift the isolators produce is large, and protecting equipment or heritage fabric is what usually justifies the cost. Tall slender buildings and very soft sites are the two cases where isolation works poorly.

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