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对椭圆环形截面钢柱进行数值模拟和设计。建立准确的有限元模型,模拟两端固接的椭圆环形钢柱。对拉伸试验得出的材料非线性及初始局部(整体)几何缺陷都进行了考虑,通过收敛性研究,以获得最佳的单元网格尺寸。采用此数值模型,对100根柱试件进行参数化研究。对材料屈服、局部屈曲、弯曲屈曲及局部屈曲与弯曲屈曲同时发生的破坏模型进行了分析。将柱的承载力试验值和数值分析结果与基于北美规范、澳大利亚规范、新西兰规范和欧洲规范的计算值进行对比。另外,还采用了不适用于椭圆环形截面钢杆的直接强度法进行分析。对这些设计方法均进行了可靠度分析。
Numerical simulation and design of elliptical ring section steel columns. Establish an accurate finite element model to simulate the oval ring steel columns fixed at both ends. The material nonlinearity and the initial local (global) geometric imperfections obtained by the tensile test are considered, and the best cell grid size is obtained through the convergence study. Using this numerical model, the parametric study of 100 columns was performed. The failure models of material yielding, local buckling, flexural buckling and simultaneous buckling and flexion buckling were analyzed. The column bearing capacity test results and numerical analysis were compared with the calculated values based on the North American Code, the Australian Code, the New Zealand Code and the European Code. In addition, the direct strength method, which is not suitable for oval ring section steel bars, is also used for analysis. The reliability of these design methods were analyzed.