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Assertion (A): Base isolation reduces the forces transmitted to a structure.

Reason (R): It lengthens the natural period into a region of lower spectral acceleration.

Select the correct option.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Shifting the period well beyond the plateau moves the structure to where the spectrum gives small accelerations, which is exactly why the forces fall. The accompanying rise in displacement is accommodated in the isolation layer.

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