Bonding Characteristics of Fiber-Reinforced Polymer Sheet-Concrete Interfaces under Dowel Load
Bonding Characteristics of Fiber-Reinforced Polymer Sheet-Concrete Interfaces under Dowel Load
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DOI：
10.1061/(asce)1090-0268(2007)11:2(138
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发表时间：
2007-04
影响因子：
4.6
通讯作者：
J. Dai;T. Ueda;Yasuhiko Sato
中科院分区：
文献类型：
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作者：
J. Dai;T. Ueda;Yasuhiko Sato
通过单向纤维增强聚合物（FRP）片材外贴混凝土缺口梁的试验研究，探讨了FRP片材-混凝土界面在竖向荷载作用下的粘结特性。FRP片材-混凝土界面的剥离性能下传力桩的接口承载能力，临界界面剥离角，界面剥离断裂能进行评估。试验参数包括混凝土基体强度、FRP片材抗拉刚度、粘结剂性能、混凝土表面处理方法以及FRP片材与混凝土基体之间的预裂缝长度。建立了界面传力杆承载力、界面剥离角和界面剥离断裂能之间的解析模型，并通过试验结果进行了验证。此外，本文展示了如何使用界面剥离断裂能校准从目前的销钉测试的实际设计剥落的预防，这是现在成为一个流行的应用FRP片材的维护和维修现有的混凝土结构在日本。
Based on a series of experimental tests on notched concrete beams externally bonded with unidirectional fiber-reinforced polymer (FRP) sheets, this paper investigates the bond characteristics of FRP sheet-concrete interfaces under dowel load, which acts vertically on the FRP sheet and leads to a mix-mode interface peeling. The peeling properties of FRP sheet-concrete interfaces under the dowel load are evaluated in terms of their interface dowel load-carrying capacity, critical interface peeling angle, and interface peeling fracture energy. Experimental parameters include strength of concrete substrate, tension stiffness of FRP sheets, properties of bonding adhesives, concrete surface treatment methods, and length of precrack set between the FRP sheet and concrete substrate. Analytical models clarifying the relationships among the interface dowel load-carrying capacity, the interface peeling angle, and the interface peeling fracture energy are built up and also verified by test results. Further, this paper shows how to use the interface peeling fracture energy calibrated from the present dowel tests for the practical design of spalling prevention, which is now becoming a popular application of FRP sheets for the maintenance and repair of existing concrete structures in Japan.