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中文摘要：
FRP-混凝土界面粘结性能是外贴FRP片材加固混凝土结构技术的关键问题.基于FRP与混凝土界面面内剪切试验,采用精细单元有限元模型对其界面粘结性能进行了研究.在该模型中,混凝土和FRP片材都使用非常小的单元加以模拟,通过调整混凝土材料的本构模型来考虑单元尺寸的影响.FRP单元和混凝土单元直接连接,通过混凝土单元的断裂破坏来模拟FRP和混凝土界面的宏观剥离破坏过程.通过与大量面内剪切试验结果对比,验证了该精细有限元模型的正确性,并基于精细有限元分析结果,对界面剥离破坏机理进行了讨论.
英文摘要：
The interfacial behaviour between FRP and concrete is the key problem for the application of FRP to strengthen concrete structures. In this paper, a finite element （FE） model is presented for the debonding in FRP-concrete interface. In this model, concrete elements are connected with FRP elements directly without additional interface elements, so the debonding is modeled with fracture of concrete elements. Very small elements （0.25mm to 0.5mm in size, referred as meso-scale model） are used to simulate the crack propagation in the concrete layer adjacent to FRP. The effect of element size is considered in modeling the behavior of cracked concrete. Comparisons between the predictions of this model and test results are presented to demonstrate the capability and accuracy of this FE model. The debonding mechanism is also examined using results obtained with the FE model.
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