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Foundations of a building in a seismic zone must be designed for

  • A.no lateral force at all
  • B.the forces the yielding superstructure can actually deliver
  • C.the gravity loads alone
  • D.half of the design base shear as a matter of routine

Answer: B

Capacity design applies to the foundation as much as to the frame: it should not fail before the intended hinges have formed, because a failed footing cannot be inspected or repaired. Uplift under the reduced dead load combination is often the critical check.

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