Discussion
The flat plateau region of a code design spectrum corresponds to
Answer: A
Correct answer: a range of periods with constant spectral acceleration
The plateau is the band of periods over which the design ordinate is held at its maximum value. It exists because the underlying spectra peak at different periods for different records and soils, so enveloping them produces a flat top rather than a single peak. Structures whose period falls in that band attract the largest acceleration the spectrum offers.
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