Dear professors, guide me in solving this question. A comparison between static push-over analysis and IDA is presented in the graphic below. The structure in the push-over diagram remains in the elastic region until it reaches an acceleration of 0.05, entering the plastic area. On the other hand, the IDA diagram shows that the structure remains in the elastic zone up to a 0.1 acceleration.
Why does the structure enter the plastic area at an acceleration of 0.05, despite the fact that it can employ the structure's elastic capacity in the push-over analysis up to an acceleration of 0.1?
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