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For a two-storey shear building with equal storey masses and equal storey stiffnesses, the number of mode shapes is

  • A.three
  • B.two
  • C.one
  • D.four

Answer: B

Two lateral degrees of freedom give two frequencies and two mode shapes: the first with both floors moving together and the second with them moving in opposition. The count follows the degrees of freedom, not the number of members.

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