作　　者： ; ; ; ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《工程力学》 2009年第11期127-133,共7页

摘　　要： 裂缝引起的界面剥离是纤维增强复合材料(FRP)片材加固受弯钢筋混凝土(RC)构件的主要破坏模式。该文以三点弯曲荷载作用下FRP片材加固RC梁为研究对象,考虑中部弯曲裂缝和界面软化行为的影响,基于FRP与混凝土界面的粘结-滑移双线性模型,推导弯曲裂缝间界面粘结剪应力的理论公式,建立有限元模型对理论计算公式进行验证,并分析裂缝间距对剥离荷载的影响。分析结果表明:界面粘结剪应力的理论计算结果与有限元分析结果吻合得较好,剥离荷载的理论值比有限元计算值和试验值均偏小;剥离荷载随着裂缝间距的增大而降低,整个变化曲线可以简化为两折线。 Intermediate crack debonding is a common failure mode of reinforced concrete （RC） beams flexually strengthened with externally bonded fibre reinforced polymer （FRP）. This study analyzes the effect of the distribution of flexural cracks and the interracial soft behavior on the interracial shear stress of RC beams strengthened with FRP laminates under three-point loading. Based on the bilinear bond-slip model of the interface between FRP and concrete, an analytical solution of the interracial shear stress in the intermediate crack zone is presented. A finite element （FE） model is established to validate the theoretical method and the effect of the crack spaces on the debonding load capacity. Comparisons among the results obtained from theoretical solution, experiments and FE method show a good agreement between the theoretical and FE results, and debonding load capacity obtained by theoretical analysis is smaller than those obtained by FE analysis and experiments. Moreover, the results show that the increase of crack space will decrease the debonding load capacity and the relationship curve between them can be simplified by a double broken line.

关 键 词： 纤维增强复合材料 粘结剪应力 剥离破坏 加固 裂缝 梁

领　　域： [理学] [理学] [建筑科学]