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The natural period of a structure is the time taken for

  • A.one complete cycle of free vibration
  • B.the ground shaking to reach its peak value
  • C.the structure to come to rest after shaking
  • D.the earthquake waves to travel to the site

Answer: A

Displaced and released, a structure oscillates at its own period, which depends on its mass and stiffness alone. It is the single most important dynamic property, because the demand is read from the spectrum at that period.

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