不锈钢冷成型管截面轴心受压构件的有限元分析

采用有限元软件ANSYS对不锈钢冷成型管截面轴心受压长柱进行模拟,有限元模型中考虑不锈钢材料的非线性本构关系、冷加工效应、构件的初始缺陷以及构件中的残余应力。将模拟结果与国内外的试验数据进行对比。对比表明:有限元模型能够准确地模拟不锈钢构件的受力全过程,模拟平均误差小于5%;对影响不锈钢轴心受压构件受力性能的因素进行分析,分析表明:方矩管截面的转角区冷加工效应,不锈钢材料力学性能参数变化以及构件的整体缺陷取值对构件的整体稳定性能影响较大,而不锈钢构件的截面对稳定系数影响很小。分析结论可作为建立不锈钢轴心受压构件稳定承载力设计公式的参考。

FINITE ELEMENT ANALYSIS OF STAINLESS STEEL COLD-FORMED TUBULAR COLUMNS UNDER AXIAL LOAD

ANSYS is employed to study the overall buckling properties of stainless steel cold formed tubular columns under axial load.Non-linear property of material,the effect of cold-formed,local and overall imperfection as well as the residual stress are considered in this model.The comparisons between test results and the calculated results are performed in order to verify the FEM model.Comparisons indicate that the developed FEM model could represent the test exactly and the deviations in average are limited in 5%.Then the influences of varieties of factor are valued.The results of parameterized analysis conclude that:the influence of the increase strength in the corner region,the parameters variation of the material property and the amplitude of the overall imperfection could cause considerable changes in the buckling strength of stainless columns;shifts in section types almost do not influence the buckling strength.The conclusion could be regarded as the foundation of the design method for cold-formed stainless steel columns.