【摘要】 为了解混合接头(灌浆套筒和钢管剪力键相结合)及方钢管约束对装配式方形截面混凝土桥墩抗震性能的影响，分别制作混合接头连接+方钢管约束、灌浆套筒连接+方钢管约束、灌浆套筒连接+无约束的装配式方形截面混凝土桥墩试件各1根开展拟静力试验及有限元计算，分析各桥墩试件的破坏模式、结构延性、耗能能力、强度退化、刚度退化、残余位移等抗震性能及影响参数。结果表明：装配式方钢管约束混凝土桥墩试件的破坏形态基本相同，均为压弯破坏。与无约束的装配式混凝土桥墩试件相比，装配式方钢管约束混凝土桥墩试件的水平荷载峰值和位移延性系数更高；与灌浆套筒连接的装配式方钢管约束混凝土桥墩试件相比，采用混合接头连接的装配式方钢管约束混凝土桥墩试件滞回曲线更饱满、无明显捏缩，抗震性能更好。对于混合接头装配式方钢管约束混凝土桥墩，增大轴压比和降低长细比可提高桥墩的承载力，但降低了延性；增大约束系数可提高桥墩的承载力和延性，建议混合接头装配式方钢管约束混凝土桥墩的轴压比≤0.3,长细比≤12,约束系数取0.58～0.90。更多还原

【Abstract】 The impact of hybrid joints(combination of grouting sleeves and steel-tube shear connectors)and constraining square steel tubes on the seismic performance of prefabricated segmental concrete piers of square cross-section is studied. Three concrete specimens, one with hybrid joints and constraining steel tubes, one with grouting sleeves and constraining square steel tubes, and one with grouting sleeves and without constraint, were prepared for quasi-static test. Finite element models were also built up to analyze the parameters concerning the seismic performance of the structure, including failure modes, structural ductility, energy dissipation capacity, strength degradation, stiffness degradation and residual displacement. The results show that the failure modes of these three types of specimens are basically similar, all belonging to bending failure. Compared with the specimen without constraint, the peak horizontal loads and displacement ductility coefficient of the specimen with constraining square steel tubes are higher. Compared with the specimen with grouting sleeves, the hysteresis curves of the specimen with hybrid joints are full and show no significant pinching, which indicates good seismic performance. For the specimen with hybrid joints and square steel tubes, either increasing the axial compression ratio or reducing the slenderness ratio can result in the improvement of the load bearing capacity of the pier, but weakens the ductility. Increasing the constraint coefficient can improve both the load bearing capacity and ductility of the specimen. For the prefabricated segmental concrete pier with hybrid joints and constraining square steel tubes, the suggested axial compression coefficient is 0.3 or less, the slenderness ratio is 12 or less, and the constraining coefficient is within the range of 0.58 to 0.90.更多还原