采用试验方法和有限元方法对Q460钢平焊带颈法兰节点轴心受压性能进行了研究。试验选用FP2121和FP2727型法兰盘，对法兰节点施加轴心压力直至其破坏。采用有限元模型对实体单元模拟法兰盘、钢管和角焊缝进行了大变形弹塑性条件下的极限承载力分析。结果表明，法兰节点的破坏形态均表现为钢管的局部屈曲，法兰盘强度有较多富余，法兰盘颈部和底部2条环形角焊缝均有传力贡献，颈部环形角焊缝与底部环形角焊缝传递力的比例约为3∶1，与试验结果一致。

Tests and analysis with the finite element method (FEM) have been used to study the behavior of Q460 welding neck flanges joints under axial compressive load. Flange modes of FP2121 and FP2727 were selected and the flange joints were subjected to axial compressive loads. The ultimate bearing capacity of the joints considering large elastoplastical deformation were analyzed by using the finite solid element. The result shows that the failure mode of the joints is the local buckling of the pipes, while the strength of the flanges is more than enough. The two circular fillet welds at neck and bottom have effects on the load transmission. The ratio of load transmission due to neck and bottom fillet weld is 3∶1, which is consistent to the testing results.