The Test Research Of NSM CFRP And Concrete Interface Bond-slip Model

In recent years,carbon fiber reinforced plastics(CFRP)reinforced concrete structure has been rapid development,compared with the Surface mounted CFRP strengthening method,the Near Surface Mounted CFRP strengthening technology has some advantages of high material utilization and durable performance,it has the very good application prospect in the field of engineering reinforcement.However,CFRP and concrete interface bonding failure mechanism has not been very good explanation,At home and abroad for the surface layer embedded paste FRP reinforcement method,test and engineering practice results show that the surface paste FRP reinforcement embedded technology is the key problem of the bond performance between FRP plate and concrete problems.The bonding performance between FRP and concrete relates to the success of the reinforcement effect.In FRP and concrete bonding effect to ensure that good circumstances,can let the FRP material used to maximize performance,thus greatly improve the reliability of the reinforcement engineering;On the other hand,if the bonding strength between FRP and concrete is not enough,cause performance of FRP in didn't give full play to their own before stripping damage occurs,leading to reinforcement effect obviously decrease,is not conducive to the safety of the structure and cause the waste of materials.Therefore,the bonding performance of FRP and concrete structure is the key to the development of this field of research and application of scientific problems.In view of the above,this topic considering the strength of concrete,groove,groove edge distance and the thickness of concrete cover four parameters,through the surface stick of CFRP and concrete prism specimens embedded single cut drawing experiment,has carried on the surface of paste CFRP and concrete embedded the stick performance test research.And this paper based on the shear stress,such as Cruz slip value formula,find concrete strength,groove width,chamfer margin,the constitutive relation of concrete protective layer thickness and the shear stress-slip corresponding to the function relation of characteristic value analysis of different parameters on the maximum shear stress and maximum shear stress when the impact of the corresponding slip value.