薄壁轴压方管极限承载力数值模拟与试验研究

Numerical Simulation and Test of Limiting Bearing Capacity of Axial Compressive Thin-walled Tube

在考虑构件的材料特性、初始缺陷对构件极限承载力影响的前提下,对一定范围长细比和宽厚比的Q235和不锈钢薄壁方管进行试验研究,结合收集到的9个已有相关试验数据,得出不同材质下薄壁方管的极限承载力,利用ANSYS对构件的极限承载能力和破坏模式进行数值分析,得到的模拟结果与试验所得屈曲载荷相对误差仅在8%以内。运用有效宽度法和直接强度法,分别计算了不同材质下构件的极限承载能力,分析发现两种方法对轴压方管承载力的计算精度都很高,但直接强度法更加简便快捷,在计算箱形截面构件承载力时更有优势。

This paper mainly tests the ultimate bearing capacity of Q235 and stainless steel thin-walled square tube with a certain long-thin ratio and wide-thick ratio,considering the material properties,the influence of the initial defect on the component’s ultimate bearing capacity and combined with experimental data,then uses ANSYS to simulate and analyze the ultimate load-carrying capacity and failure mode of the members.The errors of simulation and test results are only within 8%.In addition,both finite-width method and direct strength method are used to calculate the bearing capacity of the thin-walled members made of different materials.It is found that the direct strength method is more simple and effective,and has much advantage in the calculation of bearing capacity of box section.