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The equivalent static method is acceptable in place of a dynamic analysis for buildings that are

  • A.founded on very soft soil
  • B.regular and not too tall
  • C.irregular in plan and elevation
  • D.taller than about forty storeys

Answer: B

Where one mode dominates and the structure is regular, distributing a base shear over the height is adequate. Irregularity or great height brings higher modes and torsion into play, and codes then require a dynamic analysis.

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