Discussion
Duration of strong shaking matters to a structure because
Answer: A
Correct answer: repeated cycles accumulate damage and degrade strength
Structural damage under earthquake loading is cumulative: each large cycle of inelastic deformation cracks concrete a little further, degrades stiffness and consumes some of the available ductility. A long record subjects the structure to many more such cycles at the same amplitude, so two motions with identical peaks can do quite different damage.
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