Discussion
A 20 m tall building with brick infill has a base dimension of 16 m in the direction considered. Its approximate period from the code formula is
Answer: B
Taking \( T = 0.09 \times 20/\sqrt{16} = 1.8/4 = 0.45 \) s, appreciably shorter than the 0.71 s the bare frame formula gives for the same height. The infill has stiffened the building, which is exactly what the two formulae are meant to distinguish.
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