Discussion
In the very-short-period range of a spectrum, the spectral acceleration tends towards
Answer: D
Correct answer: the peak ground acceleration
A structure of very short period is effectively rigid: it moves with the ground rather than deforming relative to it, so its absolute acceleration equals the ground’s. The spectrum therefore starts at the peak ground acceleration at zero period, rises to the plateau as the structure becomes flexible enough to amplify the motion, and falls away beyond it.
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