Discussion
Which one of the following statements about damping is NOT correct?
Answer: C
Correct answer: Higher damping shortens the natural period appreciably
This is the incorrect statement. The damped period is \( T_d = T/\sqrt{1-\zeta^2} \), and at the damping ratios found in buildings, five to ten per cent, the change is a fraction of one per cent - entirely negligible. What damping does affect strongly is the amplitude of the response and therefore the spectral ordinates.
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