To investigate the development mechanism of sectional plastic stress and biaxial bending moments of H-section steel members prior to local buckling subjected to monotonic and cyclic loading, extensive parametric analysis models were established in ABAQUS. These models explicitly accounted for different axial force ratios, plate width-thickness ratios under different loading angles, verifying the applicability against existing experimental data. Based on the results of finite element analysis, the effects of various factors on the development of normal stresses in the cross-section were thoroughly investigated. A semi-empirical semi-theoretical calculation model was established to address biaxial loading in H-section steel members, considering bidirectional displacement, the form of normal stress distribution, and the relationship between the biaxial bending moments. By comparing the model with finite element results, it was observed that the model effectively predicted the progression of biaxial bending moments development subjected to biaxial loading in H-section steel members. This model provides a more convenient design approach for considering the partial plastic development of the cross-section in bidirectional flexural design.

为了研究 H 型钢构件在单调和循环载荷作用下局部屈曲之前截面塑性应力和双轴弯矩的发展机制，在 ABAQUS 中建立了广泛的参数分析模型。这些模型明确考虑了不同加载角度下的不同轴力比、板宽厚比，验证了现有实验数据的适用性。根据有限元分析结果，深入研究了各种因素对截面正应力发展的影响。针对H型钢构件双向受力问题，建立了半经验半理论计算模型，考虑了双向位移、正应力分布形式以及双向弯矩之间的关系。通过将模型与有限元结果进行比较，我们发现该模型有效地预测了 H 型钢构件在双轴载荷作用下双轴弯矩的发展过程。该模型为双向弯曲设计中考虑截面的部分塑性发展提供了更方便的设计方法。