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对超大直径焊接空心球节点（≥５００）进行了系统理论分析及试验研究。以弹塑性分析为基础，运用非线性有限元方法，揭示了超大直径焊接空心球节点表面的应力应变及位移的分布规律；按冲剪模型理论建立了超大直径焊接空心球节点在受拉时的承载力计算公式；基于能量法原理建立了受压球节点承载能力的理论表达式，得到了其极限载荷的上限理论解。同时本文还对６组超大直径焊接空心球受压节点进行了试验研究，对试验结果进行了二元回归分析，得到了节点各因素与其极限承载力的函数关系式，与理论结果进行了比较，二者符合较好。
The theoretical analysis and experimental research on the large-diameter welded hollow spherical joints (≥500) are carried out. Based on the elasto-plastic analysis, the nonlinear finite element method was used to reveal the distribution of stress, strain and displacement on the surface of super-diameter welded hollow spherical joints. According to the punching-shearing model theory, the super-large welded hollow spherical joint was established when it was pulled. The calculation formula of bearing capacity is based on the principle of energy law to establish the theoretical expression of bearing capacity of pressured ball joint, and the upper bound theoretical solution of its ultimate load is obtained. At the same time, six groups of ultra-diameter welded hollow ball compression joints have been experimentally studied. The binary regression analysis of the test results has yielded a functional relationship between the various factors of the joint and its ultimate bearing capacity, and compared with the theoretical results. The two are in good agreement.