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At very short periods the spectral acceleration approaches the

  • A.peak ground displacement
  • B.peak ground velocity
  • C.zero value in every case
  • D.peak ground acceleration

Answer: D

A very stiff system moves with the ground, so its peak acceleration is the ground's own. At the other extreme a very flexible system stays still while the ground moves beneath it, and its peak displacement approaches the peak ground displacement.

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