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建立了竖向轴压力和单调水平荷载作用下焊接H形截面悬臂钢柱板组弹塑性相关屈曲的有限元分析模型,通过改变轴压比、翼缘宽厚比、腹板高厚比及翼缘-腹板厚度比等参数,对非特厚实截面钢柱进行几何非线性和材料非线性有限元分析.然后,基于分析结果,利用最小相对误差拟合法得到极限弯矩比的实用计算公式.最后,基于整体-局部等稳原则导出板组容许宽厚比相关曲线方程,并通过算例对容许宽厚比相关曲线与钢结构设计规范的翼缘和腹板宽厚比限值曲线进行比较.结果表明:构件长细比较小时,规范规定的翼缘和腹板宽厚比限值可能超出容许宽厚比相关曲线限定的范围;翼缘宽厚比与腹板高厚比限值相关,并且两者均随轴压比、翼缘-腹板厚度比、构件长细比、塑性发展系数的变化而变化.
The finite element analysis model of the elasto-plastic buckling of H-section welded cantilevered steel cylinder columns with vertical axis pressure and monotonic horizontal load is established. By changing the axial compression ratio, the ratio of flange width to thickness, - web thickness ratio and other parameters, the non-special thick section of the steel column geometric nonlinear and material nonlinear finite element analysis.And then, based on the analysis results, the use of minimum relative error fitting method to obtain the practical formula for the ultimate bending moment ratio.Finally, Based on the principle of global and local stability, the formula of allowable ratio of thickness to thickness is derived to allow the curve equations of ratio of thickness to thickness to be compared, and the curves of the ratio of width to thickness of flange and web which allow the correlation curves between thickness-thickness ratio and steel structure design are compared by numerical examples. When the slenderness is small, the gauge flange-to-web width-to-thickness ratio limit may exceed the allowable thickness-to-thickness ratio curve-defined range; the flange width-to-thickness ratio is related to the web thickness-to-thickness ratio limit and both are proportional to the axial compression ratio , The ratio of flange-web thickness, slenderness ratio of components and plasticity.