针对既有单一形式连接的装配式桥墩难以同时满足中高烈度区轨道快线桥墩对抗弯刚度和多级抗震需求的问题，京雄快线提出了采用无粘结预应力筋、灌浆套筒、混凝土剪力榫及浅承插混合连接的装配式桥墩结构方案。基于室内装配式桥墩足尺模型拟静力试验，建立并验证了精细化数值模型，对比分析了单一连接与混合连接桥墩抗震性能的差异，系统研究了预应力水平、预应力筋位置、灌浆套筒长度及墩底承插深度4个连接参数对桥墩抗震性能的影响规律。结果表明：混合连接装配式桥墩在水平荷载作用下呈典型弯曲破坏，连接性能可靠，抗震性能良好。提升预应力水平可提高桥墩水平承载力，但会降低桥墩变形能力，增大残余位移，预应力水平由30%增加至70%时，承载力提高10.16%。改变预应力筋位置对桥墩抗震性能基本无影响，增大灌浆套筒长度可显著降低桥墩塑性铰长度。墩底承插深度由0.06D增加0.18D至时，可提高承台对桥墩的侧向约束作用，滞回耗能增加15.87%。为保证混合连接装配式桥墩同时具有良好的自复位和耗能能力，预应力水平不宜大于50%且墩底浅承插深度不宜超过0.12D。

In response to the challenge of simultaneously meeting the requirements for bending stiffness and multi-level seismic resistance of prefabricated bridge piers with single-form connections, the prefabricated bridge pier with hybrid connections was proposed for the first time in the Beijing-Xiong’an transit express line. The connection was comprised of unbonded prestressed tendons, grouted sleeves, concrete shear keys and shallow sockets. A refined numerical model was established and validated through the indoor quasi-static test of a full-scale prefabricated bridge pier model. The difference of seismic performance between single connected pier and hybrid connected pier is compared. The effects of four connection parameters on the seismic performance of bridge pier were systematically investigated, including prestressed level, the position of prestressed tendon, grouted sleeve length, and socket depth. The results show that, the prefabricated bridge pier with hybrid connections was a typical flexural failure mode under horizontal loading, indicating reliable connection performance and good seismic performance. Increasing prestressed level enhances the horizontal load-bearing capacity of bridge piers but reduces deformation capability, leading to increased residual displacement. When prestressed levels increase from 30% to 70%, the load capacity increases by 10.16%. Changing the position of prestressed tendon minimally affects the seismic performance of bridge piers. Increasing grouted sleeve length significantly decreases the plastic hinge length of piers. Increasing the socket depth from 0.06D to 0.18D enhances the lateral restraint effect of the pier cap, increasing hysteresis energy dissipation by 15.87%. To ensure the prefabricated bridge pier with hybrid connections have good re-centering and energy dissipation, prestressed level should not exceed 50%, and the socket depth of the pier base plug should not exceed 0.12D.