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Base isolation performs poorly on very soft deep soil because

  • A.soft soil eliminates the need for isolation altogether
  • B.the site amplifies long-period motion, which is where the isolated period lies
  • C.the isolators are not able to carry their share of the vertical load on soft ground at all
  • D.soft soil shortens the isolated period considerably

Answer: B

Soft deposits shift the energy of the ground motion towards longer periods, so moving the structure to two or three seconds can bring it closer to the site period rather than away from it. The strategy depends on the shape of the spectrum at that site, not on the isolators alone.

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