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Too much damping in an isolation system is undesirable because it

  • A.couples the superstructure back into the response and raises its accelerations
  • B.reduces the design displacement of the system to an impractically small value indeed
  • C.makes the bearings incapable of carrying vertical load
  • D.lengthens the isolated period beyond any useful range

Answer: A

Very heavy damping transmits force across the isolation plane in proportion to velocity and excites the higher modes of the superstructure. The floor accelerations that isolation was meant to reduce can then rise again, so damping is optimised rather than maximised.

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