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An isolation system must provide vertical stiffness as well as horizontal flexibility because

  • A.vertical flexibility would shorten the isolated period
  • B.the bearings would otherwise dissipate too much energy
  • C.the bearings carry the whole weight of the building above
  • D.vertical ground motion is generally larger than the horizontal component

Answer: C

Every gravity load path passes through the isolation plane, and any appreciable vertical softness would produce rocking and unacceptable settlement. Vertical isolation is generally not attempted, which is why vertical ground motion reaches the superstructure largely undiminished.

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