焊接空心球节点广泛应用于网架和网壳结构中,目前有关焊接空心球节点的计算公式都是在单管相连焊接空心球节点的基础上给出,而实际工程中的焊接空心球节点都是与多管相连.该文以四管焊接空心球节点为研究对象,首先根据四管焊接空心球节点的受力特点,给出其在轴力作用下的简化力学模型,在综合分析材料、网格密度、壳单元和实体单元优缺点的基础上建立了有限元模型. Welded hollow ball joints are widely used in the structures of grids and reticulated shells. At present, the formulas for calculating welded hollow ball joints are given on the basis of single-pipe welded hollow ball joints. However, in practice, the welded hollow ball joints Is connected with multiple tubes.This paper takes four-pipe hollow welded joints as the research object.At first, according to the mechanical characteristics of four-hollow-welded hollow joints, the simplified mechanical model under the action of axial force is given.After a comprehensive analysis of the materials, The finite element model was established on the basis of grid density, the advantages and disadvantages of shell elements and solid elements.