A precast concrete structure reinforced by steel-fiber-reinforced polymer (FRP) composite bars (SFCBs) shows good durability and controllable post-yield stiffness, which makes this kind of structure suitable for marine infrastructure. The connection technology is one of the critical issues of a precast concrete structure with hybrid reinforcement. This paper presents an experimental study on the bond-slip testing (27 pullout specimens) of composite bars connected by a grouted deformed pipe splice (GDPS) connector with different bond lengths. The reinforcement included SFCBs and pure FRP bars. The test results showed that the failure modes could be classified into three categories: rebar pullout before or after the inner steel bar yielded, rupture of the FRP wrapped on the SFCB, and mixed failure of bar pullout with a partial fiber fracture. The average bond strength of the ordinary steel bar was approximately 146.8% that of the SFCB connector with the same anchored length. When the anchored length of the SFCB specimen was 15d (d: bar diameter), the specimen could be fully anchored to fracture. An explicit hardening bond-slip model considering the post-yield stiffness of the SFCB was used to predict the bond-slip behavior of the GDPS connector, and the experimental and analytical results agreed well with each other, which demonstrates that the proposed model could provided a reference for the analysis and design of connectors for SFCB-reinforced precast concrete structures.

由钢纤维增强聚合物（FRP）复合杆（SFCB）增强的预制混凝土结构具有良好的耐久性和可控的屈服后刚度，这使得这种结构适用于海洋基础设施。连接技术是带有混合钢筋的预制混凝土结构的关键问题之一。本文介绍了通过不同粘结长度的注浆变形管接头（GDPS）连接器连接的复合杆的粘结滑移测试（27个拔出样本）的实验研究。钢筋包括SFCB和纯FRP筋。测试结果表明，失效模式可分为三类：内部钢筋屈服之前或之后的钢筋拔出，包裹在SFCB上的FRP的断裂以及钢筋拔出与纤维局部断裂的混合破坏。相同锚固长度的普通钢筋的平均粘结强度约为SFCB连接器的146.8％。当SFCB标本的锚定长度为15时d（d：钢筋直径），样品可完全锚固至断裂。考虑到SFCB屈服后刚度的显式硬化粘结滑移模型用于预测GDPS连接器的粘结滑移行为，并且实验和分析结果彼此吻合良好，这表明所提出的模型可以提供SFCB增强型预制混凝土结构连接器的分析和设计参考。