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If a dynamic analysis yields a base shear smaller than that from the empirical period formula, the code requires the designer to

  • A.scale all the dynamic results up to the empirical base shear
  • B.adopt the smaller dynamic value
  • C.average the two base shears and use the mean value
  • D.abandon the dynamic analysis and design by the static method alone

Answer: A

Computed periods depend on modelling assumptions that may overstate the flexibility, particularly where infill stiffness has been left out, so the code sets a floor. Scaling preserves the distribution the dynamic analysis produced while restoring the total to a value the code is prepared to accept.

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