X型厚壁圆管相贯节点平面外受弯抗震性能试验研究

采用相贯节点的圆钢管结构广泛应用于大跨度网格结构中,对于具有一定抗弯刚度的连接,节点将受到弯矩作用。介绍了两个不同几何参数的X型厚壁圆钢管相贯节点试件的平面外受弯滞回性能试验,结合数值分析,对节点承载能力和变形能力进行了研究。结果表明:在合理的几何参数和焊缝质量保证下,厚壁圆钢管相贯节点平面外受弯的承载力较高;厚壁圆钢管相贯节点在支主管径比β较大时节点易发生主管壁拉剪断裂破坏;在支主管径比β较大时延性等抗震性能较好,β较小时延性等抗震性能较差。

Research on seismic behavior of unstiffened thick-walled tubular X-joints under out-of-plane bending

To large span roof structures,lattice grid and reticulated shell are widely used as the common structural systems.Unstiffened tubular joint in these structures is subjected to both axial force and bending moment in and out-of-plane of member,if the connection possesses bending rigidity.An experiment on two unstiffened thick-walled tubular X-joints with different geometrical parameters under cyclic quasi-static out-of-plane bending was performed.Based on the result of experiment and numerical analysis,the seismic behavior of the joint was researched.By proper design of geometrical parameters and quality assured welds,out-of-plane bending capacity of joints can be developed.Unstiffened thick-walled tubular X-joints with the larger ratio β of branch diameter to chord diameter prone to tearing failure(tensile and shearing rupture) of the chord wall,and the joint behaves excellently in deformability and energy-dissipation capability.