Discussion
The spectral ordinate used to compute the elastic force in a structure is the
Answer: D
Correct answer: pseudo-acceleration
The elastic force is the mass times the pseudo-acceleration, \( F = m\,S_a \), which is why that ordinate is the one design codes tabulate. It is called pseudo because it is defined as \( \omega^2 S_d \) rather than measured as a true acceleration, but for the light damping found in structures the two are almost identical, and the force relation is exact by construction.
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