Discussion
A reinforced concrete frame building without infill is 20 m tall. Its approximate fundamental period from the code formula is nearest to
Answer: A
Taking \( T = 0.075 \times 20^{0.75} = 0.075 \times 9.46 = 0.71 \) s. Raising the height to the power three quarters rather than to the first power is where slips occur, and the difference is substantial for a tall building.
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