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A viscous fluid damper produces a force that depends principally on

  • A.the temperature of the fluid within the device
  • B.the velocity of the piston relative to the cylinder
  • C.the displacement of the piston relative to the cylinder
  • D.the acceleration of the structure at that storey level

Answer: B

Forcing fluid through an orifice gives a force proportional to velocity raised to some power, so the damper peaks when the structure is passing through its neutral position. Because that is when the elastic force is smallest, the damper adds little to the peak member force.

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