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对H形截面钢构件绕强轴压弯的极限抗弯性能展开研究。基于经实验校准的非线性有限元模型,进行了不同翼缘宽厚比、腹板宽厚比及轴压比组配下的H形截面钢构件的单调压弯全过程的参数分析,并对破坏模式进行了机理分析。研究表明,翼缘与腹板存在明显的相关作用,而板件屈曲形式决定了极限状态的应力分布形式,因此计算极限承载力时应考虑板件相关作用。以极限状态的应力分布特点为基础,提出了考虑板件塑性阶段屈曲相关作用的有效塑性宽度法计算截面的极限抗弯承载力。经与实验及有限元极限承载力的比较,显示该方法能够准确预测H形截面压弯构件的极限承载力。
The ultimate flexural behavior of H-section steel members around bending is studied. Based on the experimentally calibrated nonlinear finite element model, the parameter analysis of the monotonic bending process of H-section steel members under different flange width-thickness ratio, web width-thickness ratio and axial compression ratio is carried out. The failure mode Conducted a mechanistic analysis. The research shows that there is a significant correlation between the flange and the web, and the buckling of the sheet determines the stress distribution in the limit state. Therefore, the plate-related effects should be considered when calculating the ultimate bearing capacity. Based on the stress distribution in the limit state, an effective plasticity width method was proposed to calculate the ultimate flexural capacity of the section considering the buckling-related effects of the plasticity of the sheet. The comparison between the experimental results and the ultimate bearing capacity shows that the method can accurately predict the ultimate bearing capacity of H-section members.