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Assertion (A): Isolation bearings are made stiff in the vertical direction.

Reason (R): They must carry the whole weight of the building without appreciable settlement.

Select the correct option.

  • A.A is false but R is true, the bearings being flexible in both directions
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A at all
  • D.A is true but R is false, the bearings carrying no vertical load whatever

Answer: B

Every gravity load path runs through the isolation plane, and vertical softness would produce rocking and settlement. The consequence is that vertical ground motion is not isolated, which has to be dealt with separately.

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