Discussion
A spectrum gives a spectral displacement of 250 mm at the isolated period for 5 per cent damping. With 20 per cent effective damping the design displacement will be
Answer: B
Damping reduces every spectral ordinate, and at long periods the ordinate is essentially a displacement, so the design value falls. Codes supply correction factors for damping values other than five per cent, and the reduction here would be of the order of a third.
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