随着经济的快速发展和人民生活的需要，建筑业得到迅速发展，我国进入大规模基础建设时期，同时对既有建筑的鉴定、维修和加固改造显得十分重要和紧迫。采用外贴纤维增强材料进行加固具有承载力提高大、抗腐蚀性好、施工速度很快等优点，目前广泛应用，但理论研究落后实践，本文对纤维布加固混凝土梁受剪性能进行研究，提出加固设计建议，具有重要的理论意义和实际工程应用价值。 本文在和已有试验对比的基础上，用通过验证的非线性有限元方法，对考虑在相同纤维材料布单位粘贴率条件下不同纤维种类、双向粘贴、粘结滑移的影响、不同粘贴层数的影响等6组16个试件进行了模拟。根据有限元计算结果对各试件的抗剪承载力，箍筋应力，纤维布应力分布变化情况等进行了系统分析。研究表明：采用有限元方法可以较好的模拟纤维材料布和混凝土之间的粘结滑移，对纤维布加固混凝土梁受剪性能进行数值模拟计算是可行的；弹性模量小的纤维布对于提高混凝土梁的抗剪承载力有利；在纤维布种类和面积配布率相同的条件下，纤维布的宽度和净距对混凝土梁的抗剪承载力有影响，纤维布的宽度和间距并非越小越好，建议布的宽度取为75mm为宜；多层粘贴比单层粘贴获得的抗剪承载力提高效率要低；双向粘贴比单层U型+压条的粘贴方式获得更高的抗剪承载力，在单位用布量相差不多的条件下，双向粘贴也比单层U型+压条的粘贴方式的抗剪承载力增加的效率高；不同粘贴层数对抗剪承载力的提高效率并不相同，双层粘贴比单层粘贴获得的抗剪承载力提高效率要低；荷载-挠度曲线没有明显的屈服段，说明构件的破坏是突然的，符合斜截面脆性破坏的特征；外贴纤维布不但可以承担剪力，并且可以促进抗剪箍筋更好的发挥作用。 本文分析所采用的有限元方法精度较高，结论和建议对钢筋混凝土梁的抗剪加固设计具一定的有参考价值，并为进一步研究混凝土梁的加固受力性能研究打下基础。

Reinforced concrete structure is a familiar type of structure. There are two kinds of lack of bearing capacity for concrete beam: lack of just section capability and lack of oblique section capability. No matter for concrete or reinforced concrete beam, oblique failure is brittle, which is forbidden in structure engineering. Concrete beam shear strengthened by pasting FRP is an effective method for strengthening oblique bearing capability. Based on existent datas of experiments, for the sake of validating the feasibility of analyzing shear capability of beam by finite element method, this paper analyses the mechanical performances of models whose datas are exist by finite element analytic software ANSYS . Then, mechanical performances of series models are analyzed by ANSYS. This paper analyzes influence of bonding mode, that is, pasting mode and quantity of FRP, on the shear capability of RC beam. The shear capability, change on stress of stirrup steel, change on distributing of the stress of FRP are analyzed. The analysis indicates: Analysis by numbering simulation calculation on concrete structure in the help of finite element analytic software is a feasible method，which can well simulate bond-slip between FRP and concrete. FRP that with lower elastic mode is favor for the shear bearing capability of RC beam; Bonding mode, that is, different breadths and distances of FRP sheets influence shear bearing capability of RC beam; It is not the la rger or the smaller the breadths and distances of FRP sheets are better, the paper suggests breadth of FRP is 75 m; Efficiency of Several layers is lower than single layer; RC beam strengthened in bidirectional pasting has higher shear bearing capability than the one strengthened in U+layering method, but the unit FRP quantity is similar to the one which is strengthened in U+layering method, so it is more efficient;The form of breakage indicated by load-displacement is coincident with characteristics of oblique breakage. Finite Element Method in this paper is accurate.The conclusions are consultatively useful in design of reinforcement engineering,and they are basic while futher study is done on capability of shear strengthening on RC beams.