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In the very-long-period range of a spectrum, the spectral displacement tends towards

  • A.the peak ground acceleration
  • B.infinity
  • C.the peak ground displacement
  • D.zero

Answer: C

A very flexible structure barely moves while the ground moves beneath it, so the relative displacement approaches the ground displacement itself. At the other extreme a rigid structure moves with the ground and its acceleration approaches the peak ground acceleration.

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