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The vertical distribution of base shear over the height of a building in the equivalent static method is proportional to

  • A.the storey height alone
  • B.an equal share for every storey regardless of weight or height
  • C.the storey weight multiplied by the square of the storey height
  • D.the storey weight alone

Answer: C

The parabolic distribution approximates the shape of the fundamental mode, placing more force at the top where the displacement is greatest. Distributing the shear uniformly would understate the demand on the upper storeys badly, particularly in a tall building.

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