Discussion
Which one of the following does NOT affect the ordinates of a response spectrum?
Answer: C
Correct answer: The mass of the structure being designed
A response spectrum is a property of the ground motion together with the damping ratio, computed by exciting a family of oscillators of every period. Mass enters when the spectral ordinate is turned into a force, \( F = m\,S_a \), but not into the spectrum itself - and mass affects which ordinate you read only through its effect on the period.
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