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The statement a stiffer building always attracts a smaller earthquake force is

  • A.false, because stiffening shortens the period towards the plateau
  • B.true, because stiffness reduces the deflection
  • C.true, because stiffness increases the damping
  • D.false, because stiffness has no effect on period

Answer: A

Stiffening shortens the period, which for many buildings moves them up the spectrum towards the plateau and increases the acceleration demand, even though drift falls. This is one of the ways earthquake loading differs from gravity or wind.

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