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利用ANSYS有限元程序对大宽厚比H形截面轴压构件的极限承载力进行了非线性有限元分析。分析中考虑了材料非线性和初始几何缺陷的影响,通过变化构件尺寸、材料屈服强度等参数,对共计44个构件进行了分析。应用新兴的直接强度法和传统的有效截面法对构件的极限承载力进行了计算。结果显示:有限元计算结果与直接强度法计算结果及有效截面法计算结果比值的平均值分别为1.039和1.098。与直接强度法相比,有效截面法计算过程较繁琐,且结果略显保守。直接强度法起源于单轴对称截面冷弯薄壁型钢结构构件的承载力计算,分析表明用其对大宽厚比H形截面柱的极限承载力进行计算是可行的。
ANSYS finite element program was used to analyze the ultimate bearing capacity of H-sectioned axial compression members with large aspect ratio by means of nonlinear finite element method. In the analysis, the influences of material nonlinearity and initial geometric defects were considered. A total of 44 structural members were analyzed by changing the dimensions of members and the yield strength of materials. The ultimate strength of the members is calculated by using the new direct strength method and the traditional effective section method. The results show that the average value of the calculated results of the finite element method and the direct intensity method and the calculated results of the effective cross-section method are 1.039 and 1.098, respectively. Compared with the direct strength method, the effective cross-section method is more complicated, and the result is slightly conservative. The direct strength method originated from the calculation of the bearing capacity of the cold-formed thin-walled steel structure member with uniaxial symmetry section. The analysis shows that it is feasible to calculate the ultimate bearing capacity of the H-section beam with large aspect ratio.