Discussion
A structure is described as rigid in dynamic terms when its natural period is
Answer: D
Correct answer: very much shorter than the period of the excitation
A structure whose period is far shorter than the excitation's cannot flex appreciably during a cycle of the loading. It simply follows the ground, moving with it as a rigid body, and its acceleration equals the ground acceleration.
That is the short-period end of a response spectrum, where the spectral acceleration tends to the peak ground acceleration. A structure with a much longer period behaves the other way: the mass barely moves while the base does, which is the principle base isolation exploits.
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