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Assertion (A): Isolation is a poor choice for a tall slender building.

Reason (R): Overturning can put the edge bearings into tension, which elastomeric bearings resist poorly.

Select the correct option.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A at all
  • C.A is true but R is false, elastomeric bearings resisting tension very well indeed
  • D.A is false but R is true, slenderness being no obstacle to isolating a building

Answer: A

Uplift at the edge of the isolation plane is the governing difficulty for a slender building, and laminated rubber bearings delaminate rather than stretch. A tall building is also flexible already, so there is less period shift to be gained in the first place.

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