Kim Sang-Hyo, Choi Jae-Gu, Park Sejun, Lee Hyunmin, Heo And Won-Ho
School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Korea.
Railroad Infrastructure Research Team, Korea Railroad Research Institute, Gyeonggi-do 16105, Korea.
Materials (Basel). 2017 May 13;10(5):531. doi: 10.3390/ma10050531.
Joint connection methods, such as shear key and loop bar, improve the structural performance of precast concrete structures; consequently, there is usually decreased workability or constructional efficiency. This paper proposes a high-efficiency skewed pipe shear connector. To resist shear and pull-out forces, the proposed connectors are placed diagonally between precast concrete segments and a cast-in-place concrete joint part on a girder. Design variables (such as the pipe diameter, length, and insertion angle) have been examined to investigate the connection performance of the proposed connector. The results of our testing indicate that the skewed pipe shear connectors have 50% higher ductility and a 15% higher ratio of maximum load to yield strength as compared to the corresponding parameters of the loop bar. Finite element analysis was used for validation. The resulting validation indicates that, compared to the loop bar, the skewed pipe shear connector has a higher ultimate shear and pull-out resistance. These results indicate that the skewed pipe shear connector demonstrates more idealized behavior than the loop bar in precast concrete structures.
诸如剪力键和环筋等节点连接方法可改善预制混凝土结构的结构性能；然而，其工作性或施工效率通常会降低。本文提出了一种高效的斜向管剪力连接件。为抵抗剪力和拔出力，所提出的连接件斜向放置在预制混凝土节段与梁上的现浇混凝土节点部分之间。已对设计变量（如管径、长度和插入角度）进行了研究，以考察所提出连接件的连接性能。我们的测试结果表明，与环筋的相应参数相比，斜向管剪力连接件的延性高50%，最大荷载与屈服强度之比高15%。采用有限元分析进行验证。验证结果表明，与环筋相比，斜向管剪力连接件具有更高的极限抗剪和抗拔出能力。这些结果表明，在预制混凝土结构中，斜向管剪力连接件比环筋表现出更理想的性能。
