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Empirical code formulae for the fundamental period of a building are usually written in terms of

  • A.the importance factor assigned to the building
  • B.the height of the building and its structural system
  • C.the compressive strength of the concrete alone
  • D.the seismic zone in which the building stands

Answer: B

Height stands in for the mass and stiffness that are not yet known at the outset of a design, with a different expression for framed and for braced or walled systems. The zone and importance factors affect demand, not period.

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