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Base isolation is difficult to apply to a tall slender building because

  • A.the bearings would carry no vertical load at all
  • B.tall buildings of that kind do not respond appreciably to earthquake shaking
  • C.overturning moment can cause uplift and tension in the bearings
  • D.such buildings have very short fixed-base periods

Answer: C

Elastomeric bearings take compression well but tension poorly, and a slender building rocking on its isolation plane can put its edge bearings into uplift. Tall buildings are also already flexible, so there is less period shift to be gained.

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