Experiment Study On The Bond Behavior Between GFRP Composites And Concrete Under Impact Loading

In recent years, more and more structures are damaged, they are in urgent need ofrehabilitation to ensure the safe use of structure. With FRP’s high specific strength,corrosion resistance and convenient for construction, etc., it obtains more and morefavor of people. Especially as the FRP’s price has fallen sharply in recent years, itsapplication in engineering practice has gotten rapid development. Now, GFRP’s priceis the lowest and it has the longest history. Because of the high strength of GFRPmaterials, the failure mode of GFRP strengthened reinforced concrete structure isoften not break of GFRP but debonding between GFRP and concrete. Therefore, inorder to obtain safe and reliable structure reinforcement methods, we must do furtherresearch on the bonding behavior between GFRP and concrete. Moreover, in theengineering practice, the GFRP strengthened RC structure’s bearing capacity andsafety will reduce under the blast, impact, fire and other unconventional load.Therefore, it is very important to study the bond behavior between GFRP compositesand concrete under impact loading. The main job of this paper is summarized asfollows:(1) Through three-point static loading, the strain distribution of the GFRP wasgotten to research interface’s behavior with different GFRP’s width and layer. And thebond-slip of interface between GFRP and concrete were fitted.(2) Vertical drop hammer impact tests were carried out to obtain the straindistribution of the GFRP to investigate the influence of impact velocity, layer andwidth of GFRP on the interfacial bond behavior. In addition, the interface behaviorunder the dynamic load was compared with the static load.(3) According to the static and dynamic test data, a practical d ynamic and staticdesign method was reached to provide theoretical basis for the engineeringapplication, and also for further theoretical analysis.