Discussion
Two buildings of period 0.3 s and 3.0 s stand at the same site. On a typical design spectrum the one attracting the larger spectral acceleration is
Answer: D
Correct answer: the 0.3 s building
A period of 0.3 s falls on or near the plateau of a typical design spectrum, where the ordinate is at its maximum. At 3.0 s the ordinate has fallen well down the descending branch, so the flexible building attracts a much smaller acceleration - though a much larger displacement, which must be provided for at joints and separations.
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