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Which of these best describes what an isolation system does to the input energy of an earthquake?

  • A.It stores all of it elastically and returns it to the ground once the shaking stops
  • B.It reflects much of it and dissipates part of the rest
  • C.It transmits all of it into the superstructure but spreads it out over a longer time
  • D.It converts all of it into vertical motion

Answer: B

The impedance mismatch at the isolation plane keeps much of the energy from entering the building at all, and the bearings absorb a further share in hysteresis. What is left is small enough for the superstructure to carry elastically.

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