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A structure founded on soft soil with a site period of 1.0 s should preferably be designed with a natural period

  • A.as close to 1.0 s as possible
  • B.exactly equal to 1.0 s
  • C.of exactly half that value in every case
  • D.well away from 1.0 s

Answer: D

Matching the site period invites resonance and the largest demand the site can deliver, so the structural period is deliberately shifted away. Whether it is moved up or down depends on what is practical for the structural system.

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