Discussion
Reinforced concrete buildings are commonly designed assuming a damping ratio of
Answer: A
Correct answer: 5 per cent
Five per cent of critical is the conventional design value for reinforced concrete, and design spectra in codes are drawn for it. Steel structures are usually taken at two per cent, and the code supplies multiplying factors to adjust the ordinates. The figure represents the aggregate of many dissipation mechanisms - cracking, friction at joints, non-structural elements - rather than any one measurable effect.
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