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为研究方钢管钢骨混凝土柱与钢梁端板螺栓连接节点的抗震性能,进行了5个节点拟静力试验研究,分析了端板厚度、螺栓直径、混凝土强度和轴压比等因素对承载力、弯矩-转角曲线、耗能能力、承载力衰退、刚度退化、延性以及破坏模式的影响。研究结果表明:方钢管钢骨混凝土柱与钢梁端板螺栓连接节点均属于半刚性节点,初始转动刚度随着端板厚度和螺栓直径增大而提高,但节点的极限转动能力随着端板厚度的增大而减小;当承载力由端板或钢梁控制时,其具有良好的转动和耗能能力;试件承载力退化系数在0.8～1.0之间,变化幅度不大,刚度退化相比荷载退化严重;设计中应避免高强螺栓发生脆性破坏。
In order to study the seismic performance of square steel tube reinforced concrete column and steel beam end plate bolted joints, quasi-static test of five joints was carried out. The effects of end plate thickness, bolt diameter, concrete strength and axial compression ratio on the bearing capacity Force, bending moment - corner curve, energy dissipation, bearing capacity decline, stiffness degradation, ductility and failure mode. The results show that the joints of the square steel tube and the end plate of the steel beam are all semi-rigid joints. The initial rotation stiffness increases with the thickness of the end plate and the diameter of the bolt. However, The thickness decreases and increases; when the bearing capacity is controlled by the end plate or the steel beam, it has a good ability of rotation and energy dissipation; the degradation coefficient of the bearing capacity of the specimen is between 0.8 and 1.0, with little change, Degradation compared to the load; design should avoid brittle failure of high-strength bolts.