Structural Study On Fiber Anchors Of RC Beams Flexural Strengthened With FRP Plates

Recent years, as the increasing of reinforcement engineering, fiber reinforced polymers(FRP) has been widely used to strengthen reinforced concrete (RC) members for its hightensile strength-to-weight ratio, good corrosion resistance and the moderate cost. Theexternal bonded FRP (EB-FRP) has emerged as one of the most popular methods forstructural reinforcement. However, the construction members reinforced with the EB-FRPmethods have usually been failed due to FRP debonding, especially in the occation ofconstruction members flexural reinforced on the bottom surface of the member.FRP-debonding failure obviously presents to be brittle structure failure, which should beavoided. When the FRP-debonding failure occurred, the strength of the structure membermaterials hadn’t reached their ultimate strength, especially to FRP, that its advantages ofhigh strength hadn’t been performed.To solve the problem and enhance the ratio of utilized intensity of FRP, many scholarshave proposed lots of measures of anchoring. The reinforcement technique with FRP sheetanchored to RC members by FRP anchors (FA-FRP), which has been invented by J. G. Tengfrom HKPU, has the excellent reinforcement effect. At present, the study of FA-FRP onsimply supported beams hasn’t been popular. In this thesis，a non-linear finite elementanalysis is carried out on flexural behavior of RC beams reinforced with FA-FRP methodbased on existing test data. The results of FA-FRP method is compared to EB-FRP method.And a systematic investigation is carried on the effect of anchor parameters of the FRP stripsto the reinforcement effect.In this thesis，the finite element modes are created based on the existed experimentwith ANSYS. The Combin39element is introduced to simulate the bond-slip relationship ofFRP-to-concrete interface. A conclusion can be reached from the comparation of the FEAresults to the experiment results that the created finite element modes are effective to analysethe reinforcement effect of FRP to RC structures. The force-displacement relationship of theCombin39elements demonstrate that Combin39elements can simulate the bond-sliprelationship of FRP-to-concrete interface well.A conclusion is reached that the FA-FRP method can enhance the ultimate load of the reinforced structures, increase the the ratio of utilized intensity of FRP, improve the ductilityand failure mode of the members, based on the comparison of the FEA results of FA-FRPand EB-FRP.The comparison of the FEA results of FA-FRP models divided into groups by singleparameter changing indicates that the changing of the anchor parameter has obvious effecton the reinforcement results. Further, the relationship between the parameters and the resultsis non-linear, and an effective value of the parameter exists in the relationship.