中文摘要：

纤维增强复合材料布（FRP）与混凝土界面的黏结性能是粘贴FRP布加固混凝土结构中的关键问题。对预设裂缝混凝土表面粘贴FRP板的单剪搭接接头进行三维有限元模拟。在建模中考虑了预设裂缝与加载端的距离和FRP布粘贴长度两个变量,得出了FRP布与混凝土界面剪应分布曲线。基于有限元分析结果,着重对界面剪应力分布规律、剥离机理进行了讨论。研究结果表明：在加载初期,有裂缝试件的界面剪应力在裂缝处出现应力集中,当裂缝距加载端越近时,裂缝处应力集中越严重。有裂缝界面的有效黏结区首先是加载端与裂缝之间的区域,在此区域软化后,裂缝与自由端间的区域才有效地发挥作用。与无裂缝混凝土界面相比,预设裂缝界面的应力分布差异较大,从而影响其剥离机理。

英文摘要：

The interface bond performance of FRP and concrete is the key issues in the concrete structure strengthened with externally bonded FRP.A series of single-shear lap joints are simulated by the finite element analysis in which there exists a crack on the concrete surface for the model considered.Two variables are taken into account,one is the distance between the pre-crack and the loading end,the other is the length of FRP board.The shear stress distribution curves of the interface are obtained.The interfacial shear stress distribution law and peel mechanism are discussed on the basis of numerical simulation.The results show that：In the initial loading,the shear stress concentration occurs at the crack end for the specimen which there is crack on interface.The nearer the crack between the loading end,the more serious the stress concentration is.As the crack specimen is concerned,the effective bonding area is between the loading end and the crack area.After this region softening,the area between the crack and the free end will effectively function.Compared with no cracks on the concrete interface,the stress distributions of pre-crack interface are quite different,thus peel mechanism is affected.