Discussion
The response of a structure to shaking is largest when its natural period
Answer: B
Correct answer: is close to the predominant period of the motion
This is resonance. When the structure’s natural period matches the period at which the ground motion has most of its energy, each cycle of the input reinforces the response and the amplitude builds up over many cycles, limited only by damping. It is why soft soil sites, which filter the motion towards longer periods, are particularly damaging to buildings of matching period.
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