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A building with an isolated period of 2.5 s stands on a site whose predominant period is also about 2.5 s. The system is

  • A.improved by the coincidence
  • B.poorly suited to that site
  • C.ideally suited to that site
  • D.unaffected by the site period

Answer: B

Matching the site period invites the largest demand the site can deliver, which is the opposite of what isolation is meant to achieve. A different isolated period, more damping, or a different strategy altogether would be needed there.

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