Discussion
Assertion (A): A design spectrum is not the response spectrum of any single earthquake.
Reason (R): It is an envelope drawn from many records.
Select the correct option.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the construction. A design spectrum is built by computing spectra for many records appropriate to the site, then enveloping and smoothing them. It therefore has no single earthquake behind it, and no future earthquake will reproduce it - it is a design envelope, chosen so that the structure is adequate whichever of the plausible motions occurs.
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