This paper investigates the collapse modes of local buckling in I-shaped beam members subjected to monotonic loading, aiming to enhance the accuracy of structural performance evaluation. Parametric finite element analysis explores the influence of member geometry and stress state on collapse modes of local buckling. Index PFB and αp are proposed to classify the collapse modes of local buckling that develop after plasticization. Furthermore, a novel structural performance evaluation index WFp is presented, which utilize the proposed index. This index WFp enables more precise structural performance assessment by considering the local buckling collapse modes associated with various member geometries.
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