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Analytical solution for FRP-to-concrete bonded joints considering local unloading and reloading
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.engfracmech.2020.107185
Jian-Jun Zheng , Qing-Bin Li , Jian-Guo Dai

Abstract The mechanical performance of the interface between fiber reinforced polymer (FRP) laminates and concrete is essential for the analysis of FRP-strengthened concrete structures through external bonding. This paper presents an analytical solution for the pull-off behavior of FRP-to-concrete bonded joints considering local unloading and reloading. With the interfacial slip at the free end as the control variable, the focus of the analysis is to model the mechanical responses of the FRP-to-concrete interface under loading, unloading, and reloading. Based on a three-parameter nonlinear bond stress-slip model for the FRP-to-concrete interface, the interfacial slip and the strain in the FRP laminate are derived in an analytical manner. With the analytical solution, the snap-back phenomenon is analyzed. The critical bond length, and the interfacial slips at the start of unloading and at the termination of reloading are determined. Finally, the analytical solution is verified with existing test results through comparing the axial tensile force-slip relationship at the loaded end and the strain profiles in the FRP laminate.

中文翻译:

考虑局部卸载和重新加载的 FRP 与混凝土粘结接头的解析解

摘要 纤维增强聚合物 (FRP) 层合板与混凝土之间界面的力学性能对于通过外部粘合分析 FRP 增强混凝土结构至关重要。本文提出了考虑局部卸载和重新加载的 FRP 与混凝土粘结接头拉脱行为的解析解。以自由端的界面滑移为控制变量,分析的重点是模拟 FRP 与混凝土界面在加载、卸载和重新加载下的力学响应。基于 FRP-混凝土界面的三参数非线性粘结应力-滑移模型,FRP 层压板的界面滑移和应变以解析方式推导出来。利用解析解,分析了回弹现象。临界键长,确定卸载开始和重新加载结束时的界面滑移。最后,通过比较加载端的轴向拉伸力-滑移关系和 FRP 层合板中的应变分布,用现有的测试结果验证解析解。
更新日期:2020-08-01
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