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开展圆钢管T形相贯节点平面内抗弯承载力试验研究,考察T形相贯节点的抗弯承载力特性、破坏模式和计算理论。试验结果表明,T形相贯节点的破坏模式为局部屈曲破坏,随着荷载增加,节点区域主管中间位置应变发展最快,首先进入塑性并发生局部屈曲失效;继续加载后,焊缝产生撕裂破坏。对T形相贯节点进行非线性有限元模拟以研究其抗弯承载力特性,分析得到的节点荷载-位移曲线与试验结果吻合较好;节点发生局部屈曲失效,与试验破坏模式相一致。最后,分析了两个无量纲化几何特征参数对节点抗弯承载力的影响,并提出了节点抗弯承载力计算公式。
The experimental research on the plane bending resistance of T-shaped steel tubular joints was carried out. The flexural capacity, failure mode and calculation theory of T-shaped joints were investigated. The experimental results show that the failure mode of T-shaped joint is local buckling failure, and with the increase of load, the strain at the center of the node region develops fastest, and firstly the plasticity occurs and local buckling failure occurs. After continued loading, the weld ruptures and ruptures . The nonlinear finite element simulation of the T-shaped joint was carried out to study its flexural capacity. The calculated load-displacement curve was in good agreement with the experimental results. The local buckling failure occurred at the joint, which was consistent with the experimental failure mode. Finally, the influence of two dimensionless geometrical parameters on the flexural capacity of the joint is analyzed, and the formula of flexural capacity of the joint is proposed.