关键词: 混凝土;纤维增强复合材料;加固;界面力学性能

Abstract: Based on the theoretical analysis of the interfacial adhesion strength,the disintegration energy of the interface was obtained by combining the peeling test with the fiber reinforced composite reinforcement method of the old building as an example.The ratio of GⅠ and GⅡ with different peel angles was calculated by finite element method.The critical peel force of the interface was measured by using the developed double L-beam test to verify the results of the peeling test.The results show that the peeling force P caused by the interfacial damage between the concrete and the fiber reinforced composite patch in the peeling test is getting smaller and smaller as the peeling angle α increases.However,the interface failure can be deduced from the theoretical formula,and there is no fixed trend.Therefore,the G value is not a simple linear relationship with P and α.In addition,the critical stripping force obtained by the double L-beam test will change with the change of the position of the force,and the critical stripping force P decreases with the increase of the force point and the bearing distance.This is the result of the finite element program which is similar to this,which provides an important reference for measuring the effect of reinforcement design of old buildings.

Key words: concrete;FRP;strengthening;interface mechanical property