Research On The Bonding Performance Of CFRP Reinforcement And Conerete

Corrosion of steel bars in the coastal environment is the main reason for the short life and poor durability of reinforced concrete structures.Fiber rein forced polymer(FRP)have better corrosion resistance than steel bars.Using FRP bars to replace steel bars in concrete structures can fundamentally solve a series of problems caused by steel bar corrosion to reinforced concrete structures.Compared with other FRP bars,CFRP bars have better mechanics,corrosion resistance,fatigue resistance,and aging resistance.The surface structure of CFRP bars has a great influence on the bonding performance of CFRP bars and concrete.Therefore,this paper mainly takes CFRP bars as the research object,and studies the influencing factors of the bond strength between CFRP bars and concrete and the influencing factors of the bending performance of CFRP bars in concrete beams.The main research work and results of this article are as follows :(1)According to the existing test data,the numerical simulation of the test process was carried out in ABAQUS based on the finite element method,which verified the reliability of the bonding performance study of the selected elements and constitutive parameters during modeling.(2)Based on the modeling method of experimental numerical simulation reproduction,the geometric parameters of the rib surface are controlled,such as rib height,rib spacing,rib width,etc.;the effect of the CFRP rib surface geometry on the bond strength is explored.Studies have shown that: when considering the effect of rib width,when CFRP reinforced concrete obtains the max imum average bonding strength,the value of CFRP rib width is related to the strength of concrete;when considering the effect of rib spacing on the average bonding strength,the optimal rib spacing should be Take twice the diameter of the rib;when consid ering the effect of the rib height on the bond strength,the optimal rib height is 10% of the rib diameter.(3)Based on the results of finite element analysis,an optimized design formula for the basic anchorage length of CFRP reinforced concrete is proposed.(4)Finally,based on the research results of the factors influencing the bond strength of CFRP bars and concrete,the effects of reinforcement ratio,CFRP bar arrangement form,beam section size,and concrete strength on the flexural performance of CFRP concrete beams were studied.Under different influencing factors,what measures should be taken to better improve the bending resistance of the beam.