The bidirectional compression bending members exhibit interactions among their strength, stiffness, and plastic deformation capacity in their two principal axis directions. Unfortunately, there is limited research on the performance of H-shaped cross-section steel members under bidirectional compression bending controlled by local instability, making it imperative to develop further research in this area. To address this issue, a finite element model was established to investigate the nonlinear performance of H-shaped cross-section members under three combinations of different width-to-thickness ratios. The study aimed to explore the basic mechanical characteristics of bidirectional compression bending of H-shaped members while analyzing the two failure modes caused by different width-thickness ratios. To determine the limit state of H-section steel members under bidirectional compression bending, the energy inflection point method was proposed based on the principle of energy conservation. Additionally, the analysis of the mean stress development of the member section indicates that the limit state of the member determined by this method is reasonable.
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