The Parameter Analysis Of The Influence Parameters Of External CFRP Strip Position On The Effect Of Shear Reinforcement On RC Beams

U-shaped paste of FRP and side slope FRP are the two most common methods for FRP shear reinfor-cement reinforced concrete structures.In the first and second chapters,this paper introduces the research status of FRP,the force mechanism of FRP shear reinforced concrete beams and the bonding performance of FRP-concrete interface.Then in the next third and fourth chapters,the ANSYS software is used to study the phase of the change of the CFRP and the stirrup under these two strengthening methods.After changing the location and number of CFRP storeys,the shear capacity of reinforced beams and the reinforcement efficiency of CFRP are also discussed.The main research contents are as follows:(1)According to a large number of experimental studies,in general,the ultimate failure of U-shaped paste of FRP and side slope FRP shear reinforced concrete beams is caused by the peeling between fiber cloth and concrete.Therefore,whether the slip between FRP and concrete can be accurately simulated for the U-shaped paste of CFRP and 45 degrees paste of CFRP on the side,the two reinforcement parties.The numerical analysis of the method is very critical.So this paper first uses the ANSYS finite element software to simulate the experimental beam in the literature.The results show that the model is consistent with the actual situation,and the load deflection curve is basically consistent with the simulation and test.It shows that the spring unit in ANSYS and the finite element modeling method in this paper can be used.Accurately simulate the shear reinforcement of CFRP reinforced concrete beams.Then the three groups of selected bands of stirrup are simulated and analyzed in the unreinforced beams of 100 mm,200mm,300 mm,respectively.It is concluded that the simulation value and theoretical value error of the bearing capacity are within 5% range,and the trend of the crack development.The stress distribution of concrete,stirrup and longitudinal reinforcement is also consistent with the theoretical basis.Again,the validity of the simulation is valid.(2)A total of 60 reinforcement beams are simulated in this paper.Under the two strengthening methods of U-shaped paste of CFRP and 45 degrees paste of CFRP on the side,the relative position of the stirrup and the relative position of the stirrup and the number ofsticker layers of the CFRP are changed at the same time,and the shear bearing capacity of the beam is changed,and the phase of the stirrup with the stirrup is changed at the same time.The location of CFRP and the shear capacity of RC beams and the reinforcement efficiency of CFRP under different conditions are also discussed.In addition,according to the results of numerical analysis,a formula for calculating the shear bearing capacity of a reinforced beam with CFRP strip located at the middle of the two stirrups is proposed under the two conditions of U-shaped paste of CFRP and 45 degrees paste of CFRP on the side.