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Discussion

A tuned mass damper is most effective against

  • A.narrow-band excitation such as wind, and moderate earthquake shaking
  • B.very short duration impulsive earthquake motion of unusually large amplitude
  • C.the vertical component of earthquake ground motion
  • D.settlement of the foundations over a long period

Answer: A

It needs several cycles at the tuned frequency to take up energy, which wind provides and a brief near-fault pulse does not. Its main use is therefore serviceability against wind, with some benefit in moderate shaking.

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