Discussion
Consider the following statements about the design spectrum in a code.
1. It is smoothed rather than jagged.
2. It varies with soil type.
3. It is drawn for a stated damping ratio.
Which of the statements are correct?
Answer: A
Correct answer: 1, 2 and 3
All three are correct and each reflects a deliberate decision. Smoothing accommodates uncertainty in the structure’s period; the variation with soil type reflects the amplification and period-shifting that soft deposits produce; and the stated damping ratio is necessary because the ordinates depend on it. A code spectrum without all three specified would be unusable.
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