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For base isolation to be effective, the isolated period should be

  • A.approximately equal to the fixed-base period of the structure
  • B.a small fraction of the fixed-base period of the structure
  • C.equal to the predominant period of the site
  • D.several times the fixed-base period of the structure

Answer: D

Unless the isolated period is far removed from the fixed-base one, the superstructure keeps participating in the response and the benefit is small. A ratio of three or more is the usual target, and it is easiest to achieve with a stiff building.

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