Discussion
Base isolation shifts a structure's period to a long value in order to
Answer: A
Correct answer: reduce the acceleration demand from the spectrum
Isolators lengthen the period to two or three seconds, well beyond the plateau, so the structure sits far down the descending branch of the spectrum and attracts much smaller accelerations. The superstructure then moves nearly as a rigid body above the isolators. The price is a large displacement across the isolation plane, which the bearings and the surrounding moat must accommodate.
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