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Lateral force on a building during an earthquake acts

  • A.vertically upwards, relieving the weight of the building
  • B.along the axis of each column irrespective of the shaking
  • C.horizontally, in the direction the ground is moving
  • D.vertically downwards, adding to the weight of the building

Answer: C

Horizontal shaking dominates the design of ordinary buildings, and the code requires it to be considered in each principal direction in turn. Vertical motion exists as well and matters for long spans, cantilevers and isolated structures.

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