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The two principal horizontal directions of a building are considered separately in design because

  • A.the earthquake can only shake a building along one axis
  • B.the code has no method for handling two directions at once
  • C.the mass of a building differs between the two directions
  • D.the lateral system may have different stiffness in each direction

Answer: D

Frames, walls and braces are rarely arranged identically in both directions, so period, force and drift all differ between them. Each direction therefore gets its own analysis, and the code also requires a proportion of the orthogonal effect to be combined in certain cases.

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