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针对由2个C形截面和2个U形截面冷弯薄壁型钢基本构件通过自攻螺钉拼合而成的组合截面柱的轴压承载力,进行了12根(共3种截面)两端铰接冷弯薄壁型钢箱形组合截面柱轴压承载力试验,并采用有限元方法进行数值模拟,同时对构件长度进行参数化分析。研究结果表明试验值和数值模拟吻合较好,在此基础上对比了基于中国规范GB 50018—2002有效宽度法和北美规范AISI S100-2007直接强度法的承载力计算结果,及其与数值解的差异。分析表明:在修正长细比的基础上,有效宽度法计算的承载力比数值解偏低的范围在0%~30%之间,直接强度法计算的承载力比数值解偏低10%~35%。最后,提出了计算针对该类型组合截面构件承载力计算的两种建议设计方法,计算所得结果与数值模拟结果吻合且更为精确,该方法可供实际工程设计参考。
Aiming at the axial compressive bearing capacity of the composite section column composed of two C-section and two U-section cold-formed thin-walled section steel base members combined by self-tapping screws, 12 ends (three sections in total) Cold-formed thin-walled steel box-section composite column axial bearing capacity test, and the finite element method for numerical simulation, while the component length parameterized analysis. The results show that the experimental values agree well with the numerical simulations. Based on this, the calculation results of the bearing capacity based on the Chinese standard GB 50018-2002 effective width method and the North American specification AISI S100-2007 direct strength method are compared with the numerical solutions difference. The analysis shows that on the basis of the modified slenderness ratio, the bearing capacity calculated by the effective width method is 0% ~ 30% lower than the numerical solution, and the bearing capacity calculated by direct strength method is 10% 35%. Finally, two proposed design methods for calculating the bearing capacity of composite members with this type of cross-section are proposed. The calculated results agree well with the numerical results and are more accurate. This method can be used as reference for practical engineering design.