Discussion
Peak ground acceleration is usually expressed as a fraction of
Answer: A
Correct answer: the acceleration due to gravity
Quoting acceleration as a fraction of \( g \) is more than a convenience: because the inertia force is mass times acceleration and the weight is mass times \( g \), a peak of 0.3 g means a horizontal force of roughly three tenths of the structure’s weight. The figure can therefore be compared directly with the lateral strength available.
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