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The design spectrum ordinate for a very long-period structure is

  • A.independent of the period
  • B.lower than the plateau value
  • C.higher than the plateau value
  • D.equal to the plateau value

Answer: B

Correct answer: lower than the plateau value

Beyond the plateau the ordinate falls off, typically as \( 1/T \), because a very flexible structure hardly follows the ground at all - its mass stays nearly still while the ground moves beneath it. The force demand therefore drops, but the displacement demand rises, which is the trade at the heart of base isolation.

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