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分析FRP-混凝土界面的粘结性能,是研究FRP外贴加固钢筋混凝土结构的基础问题。本文根据已有的面内剪切试验研究结果,采用大型通用有限元程序MSC.Marc建立有限元模型并导入裂面剪力模型子程序,进行了非线性计算分析。引入了“裂缝带模型”、“界面粘结承载力”、“有效锚固长度”等概念,对混凝土单元开裂软化模量以及裂面剪力模型进行了优选。得到了FRP应变分布规律和界面粘结应力分布规律,提出了全新的“粘结屈服平台”概念,建议相关的界面性能非线性有限元分析采用本文的方法。
Analysis of FRP-concrete interface bonding performance, is to study the FRP paste reinforced concrete structure of the basic issues. In this paper, based on the existing in-plane shear test results, the finite element model is built by MSC.Marc, a general-purpose finite element program and imported into the sub-program of the shear-shear model. The nonlinear calculation and analysis are carried out. The concepts of “crack zone model”, “interface bond bearing capacity” and “effective anchorage length” are introduced to optimize the cracked softening modulus and cracked shear modulus of concrete elements. The law of the distribution of FRP strain and the distribution of interfacial bonding stress are obtained. A new concept of “bonding yield platform” is proposed. It is suggested that the nonlinear finite element analysis of interface performance should be based on this method.