Discussion
Effective peak acceleration is used in some codes in preference to the recorded peak because it
Answer: C
Correct answer: better represents the motion that affects structures
The recorded peak may be a single high-frequency spike lasting a few hundredths of a second, too brief to move any real structure. Effective peak acceleration is derived instead from the spectral ordinates over the period range that matters, so it correlates far better with damage - which is what a code parameter needs to do.
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