Bond Properties of CFRP Externally Bonded Reinforcement on Groove in Concrete

IF 3.6 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Concrete Structures and Materials Pub Date : 2024-06-03 DOI:10.1186/s40069-024-00678-9

Zehong Han, Jing Gao, Huaihui Song, Gongyi Xu

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Abstract

Externally bonded reinforcement on groove (EBROG) is a significant reinforcement technology proposed by researchers to enhance the bond properties of reinforced concrete structural members. To understand the influence of groove size on concrete specimens of different strength, a total of 60 concrete specimens with 4 different strengths were cast with the single shear test in this paper, among which 48 EBROG specimens and 12 specimens with externally bonded reinforcement method (EBR) were used as the control group. The failure modes and failure mechanisms of specimens with various sizes and reinforcement methods were analyzed. Additionally, the test results of ultimate load, load–displacement curves, and bond-slip curves for specimens with different groove sizes were compared. The effectiveness of EBROG method in enhancing the ultimate load capacity at the bond interface of the specimens is proved. Furthermore, in situations where the volume of the groove was kept constant, the specimens with lower concrete strength and deeper groove exhibited superior bond properties. Also, the influence of groove width on bond properties was better than that of groove depth. Finally, the test results in this paper were compared with the prediction of the existing EBR and EBROG models to evaluate the performance of different models, and based on the original model, a prediction model for EBROG method in the groove region with higher accuracy was proposed.

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CFRP 外粘结钢筋在混凝土凹槽上的粘结性能

槽外粘结加固（EBROG）是研究人员提出的一项重要加固技术，可增强钢筋混凝土结构件的粘结性能。为了解凹槽尺寸对不同强度混凝土试件的影响，本文采用单剪试验浇注了 4 种不同强度的共 60 个混凝土试件，其中 48 个为 EBROG 试件，12 个为外部粘结加固法（EBR）试件作为对照组。分析了不同尺寸和加固方法试样的破坏模式和破坏机制。此外，还比较了不同凹槽尺寸试样的极限荷载、荷载-位移曲线和粘结-滑移曲线的测试结果。结果证明，鄂毕拉格法能有效提高试样粘接界面的极限承载能力。此外，在凹槽体积保持不变的情况下，混凝土强度较低、凹槽较深的试样表现出更优越的粘结性能。同时，凹槽宽度对粘结性能的影响优于凹槽深度。最后，本文将试验结果与现有 EBR 和 EBROG 模型的预测结果进行了比较，以评估不同模型的性能，并在原有模型的基础上，提出了一种精度更高的沟槽区域 EBROG 方法预测模型。

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来源期刊

International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

6.30

自引率

5.90%

发文量

审稿时长

13 weeks

期刊介绍： The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.