In this paper,the Finite Element Method (FEM) is taken to analyze the failure mode and carrying capacity of the combined connection with bolts and welds. The FEA results are compared with those come from experimental investigation. Further analysis based on FEM is performed to research the failure mode and bearing performance of the combined connection and the contribution of bolts and welds. It is shown that when the strength of one of bolt or weld is much higher than the other,the connection with lower strength fails first,whose carrying capacity can be fully used,while the carrying capacity of the connection with higher strength cannot. The strength ratio between bolt and weld affects the carrying capacity. When designing the combined connections, the influence of the strength ratio of bolt and weld should be considered. The combined connection with welds and bolts, which has advantages of both weld and bolt connections, can be widely used in reinforcing the joint in steel structure.%目的:对栓焊并用连接节点的受力性能进行有限元模拟,分析栓焊并用连接的承载性能.方法:对栓焊并用连接节点的受力性能进行有限元模拟,有限元模拟结果与试验数据进行对比分析,吻合较为良好.基于有限元计算结果进一步分析了栓焊并用连接节点的破坏模式和承载力,分析了螺栓和焊缝各自对承载力的贡献程度.结果:当栓焊并用节点中螺栓或焊缝其中一种连接形式的承载力明显高于另一种时,强度较低的连接形式首先发生破坏,承载能力基本充分发挥；强度较高的连接形式的承载能力不能得到充分的发挥.栓焊强度比是影响栓焊并用连接承载性能的重要指标,在节点设计中应考虑栓焊强度比的影响.结论:栓焊并用连接节点兼具高强度螺栓连接和焊接连接的优点,在钢结构节点加固改造工程中有很大的应用空间.
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