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A structure has a natural period of 0.5 s and the site's predominant period is also 0.5 s. The likely consequence is

  • A.a change in the magnitude of the earthquake
  • B.resonance, with greatly amplified response
  • C.cancellation, with the response reduced almost to zero
  • D.no effect, since the two periods are independent

Answer: B

When the driving motion is concentrated at the structure's own period, successive cycles reinforce the response and displacements build up. Matching periods is what destroyed mid-rise buildings on soft ground in Mexico City in 1985.

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