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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。
The axial compression behavior of Q460 steel flat welded flange joints was studied by the test method and finite element method. Test choose FP2121 and FP2727-type flange, the axial pressure applied to the flange node until its destruction. The finite element model was used to analyze the ultimate bearing capacity of solid flange, steel pipe and fillet under large deformation and elasto-plastic conditions. The results show that the failure modes of the flange joints all show the local buckling of the steel pipe, the strength of the flange is more surplus, and the two annular fillet welds at the flange and the bottom of the flange contribute to the force transmission. Seam and the bottom of the annular fillet welding force transmission ratio of about 3: 1, consistent with the test results.