Concrete structures with shallow grooving depths require minimal adjustments to accommodate horizontal near-surface-mounted (NSM) carbon fibre-reinforced polymer (CFRP) strips. This method proves advantageous in minimizing damage to reinforced concrete structures, establishing itself as an effective reinforcement technique. To delve into the interfacial performance of the horizontal CFRP strip reinforcement, single shear pull-out testing is utilized to analyze and compare the interfacial bonding performances of concrete specimens reinforced with external bonding (EB), NSM, and horizontal NSM CFRP strips. The study also explores the influence of groove depth-to-width ratio on the interfacial bonding performance of horizontal NSM CFRP strip reinforcement. An interfacial bond-slip principal structure model of horizontal NSM CFRP strips and concrete is established, factoring in the groove depth-to-width ratio. Subsequently, the proposed interfacial bond-slip model is validated through finite element numerical simulation. The results show that the horizontal NSM CFRP strips reinforcement method exhibits commendable bonding capacity and interfacial bond stiffness. Within a specific range of groove widths, increasing the groove depth-to-width ratio diminishes the distance between the peak bond shear stress location and the loading end of the horizontal NSM CFRP strip-reinforced specimens. This improves the interfacial bonding performance between the horizontal NSM CFRP strips and concrete. The theoretical curve derived from the interfacial bond-slip principal structure model aligns well with test data across all reinforced specimens. FEM numerical simulations based on this interface bond-slip principal structure model demonstrate minor relative errors compared to experimental values. Furthermore, the theoretical distribution curve of CFRP strip strain closely follows the measured distribution curve. This model concerning the bond-slip principal structure of the interface between horizontal NSM CFRP strips and concrete, accounting for the groove depth-to-width ratio, exhibits applicability and stands as a valuable reference for practical engineering applications.

中文翻译：

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考虑沟槽深宽比影响的水平埋设CFRP条与混凝土界面粘结滑移


开槽深度较浅的混凝土结构只需进行最少的调整即可适应水平近表面安装 (NSM) 碳纤维增强聚合物 (CFRP) 条带。事实证明，这种方法有利于最大限度地减少对钢筋混凝土结构的损坏，使其成为一种有效的加固技术。为了深入研究水平CFRP条加固的界面性能，采用单剪拉拔试验对外部粘结（EB）、NSM和水平NSMCFRP条加固的混凝土试件的界面粘结性能进行了分析和比较。研究还探讨了凹槽深宽比对水平NSM CFRP条增强界面粘结性能的影响。建立了水平 NSM CFRP 条带和混凝土的界面粘结滑移主要结构模型，考虑了凹槽深宽比。随后，通过有限元数值模拟验证了所提出的界面粘结滑移模型。结果表明，水平NSM CFRP条加固方法表现出良好的粘结能力和界面粘结刚度。在特定的凹槽宽度范围内，增加凹槽深宽比会减小峰值粘结剪切应力位置与水平 NSM CFRP 条增强试件加载端之间的距离。这提高了水平 NSM CFRP 条带与混凝土之间的界面粘合性能。从界面粘结滑移主结构模型得出的理论曲线与所有增强样本的测试数据非常吻合。 基于该界面粘结滑移主结构模型的有限元数值模拟表明，与实验值相比，相对误差较小。此外，CFRP条应变的理论分布曲线与实测分布曲线非常接近。该模型涉及水平NSM CFRP条带与混凝土界面的粘结滑移主要结构，考虑了沟槽深宽比，具有一定的适用性，对实际工程应用具有重要的参考价值。