加劲肋对焊接球节点力学性能影响的数值分析

Numerical Analysis of Welded Ball Joints with Stiffeners

网架(网壳)结构中,采用加劲肋来提高节点的极限承载力是一种有效的方法。在4组12个焊接球节点的轴心受力试验基础上,采用ABAQUS有限元分析软件,同时考虑几何非线性和材料非线性的影响,利用弧长法对球节点进行模拟分析,并与试验结果进行对比来验证模型的合理性。进而研究轴向荷载作用下,空心球节点在不同的加劲肋数量和方向下的力学性能,总结了加劲肋对球节点的拉压极限承载力和变形的影响,并对现行规范中关于焊接球节点的承载力计算公式提出了修改建议,具有一定的参考价值。

Adding stiffeners is an efficient way to enhance the bearing capacity of welded ball joints.12 welded ball joints with 4 different physical sizes were tested under uniaxial compressive or tensile loads.A finite element software ABAQUS was adopted to simulate the loading process of those ball joints.With the consideration of geometric nonlinearity and material nonlinearity and the adoption of arc-length method,the computing results showed a good agreement with the test data,which proves the validity of the finite element model.This paper concentrates on the influence of stiffeners on the ultimate bearing capacity and deformation of welded ball joints.Effects of the stiffener＇s directions（6 cases） and quantity（2 cases） were studied by the finite elements modeling and illustrated at the end of this paper.The conclusion is of reference value for the relevant design recommendations.