Research On The Interfacial Continuous Damage Model Of CFRP Reinforced Anchorage

Carbon Fibre Reinforced Plastics(CFRP)has high strength,light weight and corrosion resistance.It can be applied to long-span spatial structures,cable-stayed cable-girder bridges and other structural systems to solve the problems of traditional prestressed steel corrosion and low load-bearing efficiency.It is widely used in civil engineering.As the basic component of a prestressed cable,the performance of its anchoring system is very important.At present,the commonly used anchoring types of CFRP tendons include bonding anchors,mechanical clamping anchors,and bondingclamping composite anchors.Among them,bonded anchors are the most widely used in engineering due to their unparalleled advantages such as high anchoring efficiency and low damage to the reinforcement.Since the bond failure of CFRP tendon bond type anchoring system often occurs under common load conditions,this paper uses the theory of damage and fracture mechanics to theoretically analyze and study bond failure behavior of bond type anchors under static load.The main work is as follows:(1)For the CFRP tendon bonded anchorage under tension-push force,according to the bond-slip relationship of different bonding media,the closed analytical solution of the interface stress distribution in the anchoring zone is solved,and the bearing is analyzed based on this The main influencing factors of power.(2)For the CFRP tendon bonded anchorage under tension-tension state,taking the bilinear bond-slip constitutive relationship as an example,each stress development stage is discussed in detail,and the load in the whole process of the force is derived theoretically-Displacement curve and analytical expressions of the interface slip,interface shear stress and normal stress distribution of the reinforcement at each stage of the anchoring zone.(3)Based on the calculation example,and with the help of the existing test and finite element analysis results,the above theoretical analysis model was analyzed and verified.The research in this paper is mainly to theoretically analyze the distribution of the stresses on the interface of the CFRP bonded anchorage at different loading stages.The results can be used to predict the shear stress distribution of the anchorage interface in the anchoring zone and the elasticity of the anchoring system.The bearing capacity,ultimate bearing capacity,and debonding bearing capacity can also be used for the design and optimization of the design parameters of the anchor system in the project.