Discussion
A structure of period 0.5 s reads a spectral acceleration of 0.6 g. Its seismic weight is 2,000 kN. Ignoring any response reduction, the base shear is
Answer: C
Base shear is the spectral acceleration coefficient times the seismic weight, so \( 0.6 \times 2{,}000 = 1{,}200 \) kN. Because the acceleration is already expressed as a multiple of \( g \), no further division by \( g \) is needed - doing so is a common error.
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