Discussion
A trap in reading modal results is to assume that
Answer: A
Correct answer: the peak responses of different modes occur at the same instant
Each mode has its own period, so its peak arrives at its own moment. Adding the modal peaks arithmetically would assume a coincidence that does not occur and would badly overstate the response.
That is why modal combination rules exist: square root of the sum of squares for well-separated periods, and complete quadratic combination where periods are close enough for the modes to interact. The other three statements are all true of modal analysis.
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