This paper proposes a new kind of U-type reinforcement ferrule (URF) connection for the assembly of precast concrete (PC) components, which has a good fault-tolerance ability and low cost of construction with a simple post-grouting process. The modified connection features welded U ferrules, which can increase the bonding mechanism and internal stress transmission in the spliced region. A series of quasi-static cyclic tests were performed on URF-connected PC columns with different welding patterns. Comprehensive comparisons were performed on the load-bearing capacity, the plastic energy dissipation ability, the internal force transmission, the column ductility and the stiffness. The results indicated that PC columns with welded URF connections can ensure better lateral resistance than the cast-in-place concrete column. The weld type and length influence the connection performance, and the 15d-welded and full-length welded URF connections presented better connection performance and were suggested for the assembly of PC columns. Then, finite element analyses were performed to further reveal the working and failure mechanisms and the affecting mechanism of some working parameters. Parametric simulations indicated that the increase in the axial load ratio and the concrete strength in the postcast region had a slight but limited effect on improving the lateral resistance of the column connection.

中文翻译：

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具有改进的 U 型钢筋套圈连接的预制混凝土柱的抗震性能

本文提出了一种用于装配预制混凝土 (PC) 组件的新型 U 型钢筋套圈 (URF) 连接，它具有良好的容错能力和较低的施工成本，后灌浆过程简单。改进后的连接采用焊接 U 型套圈，可以增加拼接区域的结合机制和内应力传递。对具有不同焊接图案的 URF 连接 PC 柱进行了一系列准静态循环测试。对承载能力、塑性耗能能力、内力传递、柱延性和刚度进行了综合比较。结果表明，与现浇混凝土柱相比，采用焊接 URF 连接的 PC 柱可以确保更好的侧向阻力。焊缝类型和长度影响连接性能，15d 焊接和全长焊接 URF 连接具有更好的连接性能，建议用于 PC 柱的组装。然后进行有限元分析，进一步揭示了工作和失效机制以及一些工作参数的影响机制。参数模拟表明，轴荷比和后浇区混凝土强度的增加对提高柱连接的侧向阻力的影响很小但有限。进行了有限元分析，进一步揭示了工作和失效机制以及一些工作参数的影响机制。参数模拟表明，轴荷载比和后浇区域混凝土强度的增加对提高柱连接的侧向阻力的影响很小但有限。进行了有限元分析，进一步揭示了工作和失效机制以及一些工作参数的影响机制。参数模拟表明，轴荷载比和后浇区域混凝土强度的增加对提高柱连接的侧向阻力的影响很小但有限。