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For a building with brick infill panels, IS 1893 gives the approximate fundamental period as

  • A.\( 0.075h^{0.75} \) as for a bare reinforced concrete frame
  • B.\( 0.085h^{0.75} \) as for a bare steel moment resisting frame
  • C.\( 0.09\sqrt{h}/d \) with the height under the root instead
  • D.\( 0.09h/\sqrt{d} \)

Answer: D

Here \( d \) is the base dimension in the direction being considered, and the formula recognises that infill panels act as struts and stiffen the frame considerably. A stiffer building has a shorter period and therefore usually reads a larger acceleration from the spectrum.

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