Discussion
The capacity curve produced by a pushover analysis plots
Answer: C
Correct answer: base shear against roof displacement
The capacity curve records the structure's resistance as it is pushed progressively further: base shear on one axis and roof displacement on the other.
Its shape tells the story - an initial linear portion, a knee as members begin to yield, a plateau at the mechanism, and eventual degradation. That is what makes pushover analysis a nonlinear method: the curve shows not only the strength but the displacement over which it is sustained, which is the ductility available.
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