Interfacial Shear Behavior of Novel Connections Between Concrete Bridge Piers and Anti-Overturning Steel Supporting Joists

作者：Gongyong Mei, Chengan Zhou, Shengze Wu, Lifeng Zhang, Jie Xiao, Peisen Li, Zhenkan Chen, Quan Shi, Jiaxin Hu, Haibo Jiang · 发表于：Buildings · 年份：2025 · DOI：10.3390/buildings15081299 · 被引用次数：2 · 研究领域：Geotechnical Engineering and Underground Structures、Structural Behavior of Reinforced Concrete、Structural Engineering and Vibration Analysis

Additional steel supporting joists (ASSJs) can effectively enhance the anti-overturning capacity of the existing solo-column concrete pier (SCP) bridges. Although the interface consists of bolt connections between steel and concrete is the crucial load-transmitting portion, the design of the interface between the ASSJ and SCP still mainly relies on practical experiences. In an actual bridge rehabilitation project with ASSJs in China, a novel connection comprising large-diameter bolts and an epoxy resin layer was adopted to overcome the shortcomings of the initial design. In this study, connections composited with large-diameter bolts and different interfacial treatments were investigated. Four push-out tests on the interfacial shear performance of steel–concrete connections were carried out. The experimental parameters encompassed the interface treatment method (barely roughened surface, smearing epoxy resin, and filling epoxy mortar) and the number of bolts (single row and double rows). The failure modes were unveiled. According to the experimental results, the interfacial treatment method with filling epoxy mortar could uniformly transfer stress between concrete and steel and improve the shear stiffness and shear resistance of the steel–concrete connections. Compared with specimens with barely roughened interfaces, epoxy mortar and epoxy resin employed at the steel–concrete interface can increase the shear-bearing capacity of connections by approximately 47.71% and 43.46%, ...