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Base isolation reduces the seismic force on a structure principally by

  • A.increasing the damping of the superstructure itself
  • B.lengthening its natural period into a region of low spectral acceleration
  • C.shortening its natural period so that the structure becomes effectively rigid on its foundation
  • D.removing the mass of the structure from the calculation

Answer: B

Shifting the period well beyond the plateau of the spectrum moves the structure to where the ordinate is small, and the accompanying rise in displacement is taken up in the isolation layer. Added damping in the bearings helps, but the period shift does most of the work.

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