Discussion
Arrange the steps of a response spectrum analysis in order.
1. Combine modal responses statistically 2. Read the spectral ordinate for each mode 3. Compute periods and mode shapes
Answer: C
Correct answer: 3, 2, 1
The sequence is fixed by what each step needs. Periods and mode shapes come from the mass and stiffness matrices alone. The spectral ordinate for each mode can then be read at its own period. Finally the modal responses, each a separate maximum, are combined statistically - by the square root of the sum of squares if the periods are well separated, or the complete quadratic combination if not.
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