Study On The Bonding Performance Between FRP And Concrete/Masonry

Fiber Reinforced Polymer(FRP)is widely used for structural reinforcement due to its light weight,high tensile strength,good corrosion resistance and ease of construction.The bond behavior between FRP and the reinforced material is the basis of the collaborative work.In order to better utilize the advantages of FRP and reduce the loss and damage caused by brittle debonding failure,it is an important issue to study the bond performance between FRP and the reinforced material.In this paper,the numerical simulation method is adopted to study the bond between FRP and concrete under monotonic load,and a bond-slip model based on finite element simulation between FRP and concrete under monotonic load is proposed.The bond performance between FRP and concrete under cyclic loading is further studied.The bondslip curve under cyclic loading is introduced,and a new definition of damage of bond stiffness after circulation is proposed.Comparing and analyzing the existing bond-slip model between FRP and concrete,the bond-slip model based on the function model of bond-slip curve from finite element between FRP and concrete under theoretical analysis is proposed,and the plausibility and the applicability of the model were verified by finite element software.Considering the properties of concrete and masonry showing brittle failure in materials,three different finite element simulation modeling methods are proposed to carry out the bond performance between FRP and masonry to select a more reasonable and efficient one.Based on the theoretical analysis method proposed,the numerical simulation study on the bending-resistant RC beam reinforced by FRP is carried out to analyze mechanical properties under the influence of the bond-slip relationship from the simulation of the material level to the component level.The main research results of this paper are as follows:(1)A bond-slip model between FRP and concrete under monotonic load is proposed from finite element simulation.(2)The curve of bond-slip between FRP and concrete under cyclic load and the definition of stiffness damage factor under cyclic unloading are proposed.(3)The model of bond-slip between FRP and concrete under theoretical analysis is proposed.(4)A simple and computationally efficient finite element verification model for the bond-slip relationship is proposed.(5)A finite element model for the simulation of the bond behavior between FRP and masonry is proposed.(6)A finite element prediction model for bending-resistant RC beam reinforced by FRP is proposed,which considers the bond-slip relationship between reinforcement and concrete and between FRP and concrete.