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A rigid floor diaphragm assumption reduces the number of degrees of freedom by

  • A.removing the mass of the floor from the model entirely
  • B.eliminating the vertical stiffness of every column below it
  • C.making the floor flexible in its own plane instead
  • D.tying all points on a floor to three degrees of freedom

Answer: D

Two translations and a rotation describe the whole floor if it cannot deform in plan, which is a good approximation for most reinforced concrete slabs. Long narrow or heavily perforated floors may require a flexible diaphragm model instead.

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