不锈钢工字形截面构件轴心受压整体稳定计算方法

为了研究不锈钢工字形轴心受压构件的整体稳定承载力,采用ANSYS软件建模对不锈钢轴压构件进行非线性有限元模拟,将模拟结果与试验结果进行对比,验证了所建立的有限元模型的准确性.采用经试验验证的有限元模型对不同几何初始缺陷、截面残余应力、材料力学性能、截面宽厚比以及长细比的不锈钢工字形构件整体稳定承载力进行了参数分析,通过对比可确定材料力学性能、构件长细比为主要影响承载力的因素.在参数分析的基础上通过稳定承载力的数据拟合提出了整体稳定系数的三段式计算方法,并将该计算方法与试验数据进行对比,表明此计算方法可以较为准确地计算不锈钢工字形轴心受压构件整体稳定承载力.

Calculation Method of the Overall Stability for I-shaped Stainless Steel Member under Axial Compression Load

In order to investigate the overall stability of I-shaped stainless steel member under axial compression load, the nonlinear finite element analysis of the stainless steel members subjected to axial compression load was performed by ANSYS software. By comparing the numerical results with the experimental results, the accuracy of the finite element model was verified. The effects of initial geometric imperfections, section residual stress, material mechanical properties, and section width-thickness ratio and slenderness ratio on the overall stability of the members were parametrically analyzed by means of the validated finite element analysis. According to the comparison, it can be seen that the material mechanical properties and slenderness ratio of the members are the key influential factors. Based on the parameter analysis, a new three-segment formula for calculating the overall stability coefficient was proposed by data fitting. The proposed three-segment formula can accurately predict the overall stability bearing capacity for I-shaped stainless steel member under axial compression load.