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Base isolation as a retrofit measure is most often chosen for

  • A.buildings founded on deep soft clay deposits with long predominant site periods
  • B.heritage buildings and essential facilities
  • C.ordinary residential buildings
  • D.light single-storey structures of no particular value to their owners or occupants

Answer: B

Correct answer: heritage buildings and essential facilities

Base isolation reduces the demand on the superstructure rather than strengthening it, so the fabric above can be left alone - which is what a heritage building needs. And it keeps the structure close to elastic, so an essential facility remains usable after the earthquake rather than merely standing.

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