Discussion
Design spectra are smoothed chiefly because
Answer: B
Correct answer: the exact period of a structure is never known precisely
A recorded spectrum is jagged, with sharp peaks and troughs whose positions depend on the particular record. A real building’s period is uncertain by a substantial margin - non-structural stiffness, cracking and the actual mass all shift it - so designing on a sharp trough would be unsafe. Smoothing and enveloping ensure the design ordinate is adequate wherever the true period turns out to lie.
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