槽钢连接的装配式矩形钢管柱-H型钢梁节点平面内受弯性能分析

In-plane bending behavior of channel connections between rectangular tubular column and H-shaped beam

为研究由槽钢翻转连接的矩形钢管柱-H型钢梁装配式节点的受弯性能,对4种不同槽钢构造的节点进行了有限元分析。首先建立竖向翻转槽钢连接节点的有限元模型,并用试验结果验证了模型的可靠性;然后改变槽钢布置方向及加劲肋位置,对比了各节点的破坏模式、弯矩转角曲线、受弯承载力及初始刚度,分析了槽钢连接节点的受弯机理。结果表明:竖向及横向翻转槽钢可较好保护柱翼缘,节点的破坏均由槽钢及梁端板的强度控制,柱翼缘应力水平较低;当槽钢型号相同时,空腹槽钢竖放节点的受弯承载力高于空腹槽钢横放节点,在横放槽钢内焊接加劲肋可显著提高节点受弯承载力,在横放槽钢间焊接加劲肋则对节点受弯承载力无影响。进一步的机理分析表明,横放槽钢内焊接加劲肋使槽钢腹板的约束条件由两对边约束变为三边约束,增加了槽钢刚度,进而提高节点承载力。本研究可为槽钢连接梁柱节点的深入研究提供参考。

In order to study the in-plane bending behavior of reversed channel connection between rectangular tubular column and H-shaped beam, four reversed channel connections with different configurations were analyzed numerically. Firstly, finite element models of vertical reversed channel connections were built and verified by experimental results. Then, by changing the direction of the channel and the position of stiffener, the failure modes, moment-rotation curves, flexural capacity as well as the initial stiffness of the connections were analyzed. Finally, the bending mechanism of the channel connections were discussed. The results indicate that the surface of the column is protected by the reversed channel. The failure of the connections mainly appears on the channel and the end-plate, and the stress on the column flange is low. With the same configuration of the channel, the flexural capacity of vertical channel connection is greater than the horizontal channel connection without stiffener. The stiffener in the horizontal channel improves the flexural capacity of the connection significantly, while welding a stiffener between the horizontal channels has no influence on the flexural capacity. Further mechanism analysis indicates that the stiffeners in the channel enhance the constraint of the channel web and improve the stiffness as well as the flexural capacity of the connection. This can provide a basis for further study of the horizontal channel connections.