The authors propose a hybrid joint connection using grouted corrugated steel sleeves and cast-in-place UHPC tenon (abbreviated as GS-UHPC) for precast bridge piers. The GS-UHPC joint is not disconnected between the adjacent precast segmental reinforced concrete (RC) bridge piers and improves the integrity as well as accelerates construction of the structures. The failure modes, carrying load capacity, joint opening performance, rotation capacity, and ductility of the jointed columns with GS-UHPC were investigated through the compression-bending static test. Furthermore, the hysteretic behavior, energy dissipation capacity, residual deformation and stiffness degradation of the jointed column were discussed through the cyclic loading test. The experimental results indicated that under the static loading, the GS-UHPC joint presented a ductile failure characterized by the concrete crushing at the compression zone, severe joint opening, and the yielding of the connecting rebars. The flexural stiffness of the jointed column was similar to the complete RC column at the same axial compression ratio before the yielding of the connecting rebars, but the crack resistance and displacement ductility were better than the complete RC column. As the axial compression ratio increased, the ductility, rotation capacity, severity of joint opening, and tensile stress development speed of the connecting rebars of the jointed columns were reduced. Under the cyclic loading, the GS-UHPC joint had a good deformation resilience before the yielding of the connecting rebars, while the hysteresis loops were wide with a good energy dissipation after the yielding of the connecting rebars. In addition, the profile of the skeleton curve of the jointed column was almost overlapped with the load-deflection curve under the monotonic loading. The degradation of equivalent stiffness ($K_s$) gradually slowed down as the joint opened (or RC cracked), and the yield and ultimate loads reached.

作者提出了一种混合接头连接，该连接使用注浆波纹状钢套筒和现浇UHPC榫（缩写为GS-UHPC）用于预制桥墩。GS-UHPC接头在相邻的预制分段钢筋混凝土（RC）桥墩之间没有断开连接，并改善了完整性并加快了结构的施工。通过压弯静力试验研究了GS-UHPC连接柱的破坏模式，承载能力，接头开启性能，旋转能力和延性。此外，通过循环荷载试验讨论了节理柱的滞后性能，能量耗散能力，残余变形和刚度退化。实验结果表明，在静态载荷下，GS-UHPC接头表现出延性破坏，其特征是压缩区的混凝土被压碎，接头处严重张开以及连接钢筋的屈服。在连接钢筋屈服之前，在相同的轴向压缩比下，节理柱的抗弯刚度与完整的RC柱相似，但抗裂性和位移延展性优于完整的RC柱。随着轴向压缩比的增加，节理柱的连接钢筋的延展性，旋转能力，接头开口的严重程度和拉应力发展速度降低。在循环荷载作用下，GS-UHPC接头在连接钢筋屈服之前具有良好的变形弹性，在连接钢筋屈服后，磁滞回线宽且具有良好的能量耗散。另外，在单调载荷作用下，节理柱骨架曲线的轮廓几乎与载荷-挠度曲线重叠。等效刚度的降低（${ķ}_s$）随着接头的打开（或RC破裂）逐渐减慢，并达到屈服和极限载荷。