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Higher effective damping in an isolation system results in

  • A.a larger design displacement for the same isolated period of the system
  • B.a longer isolated period for the same bearing stiffness
  • C.no change in the design displacement of the system
  • D.a smaller design displacement for the same isolated period

Answer: D

Damping reduces the spectral ordinate, and at long periods that ordinate is essentially a displacement. Trading damping against displacement is the central design decision in sizing an isolation system and its surrounding gap.

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