Design Strategies Study On Flexural Behavior Of Concrete T-beam Prestressed With CFRP Tendons

Reinforced concrete structure is an enormous quantity wide range of structural forms, butthe safety, usability and durability can be affected seriously by the steel corrosion. In order tosolve this situation, the fiber-reinforced polymer (FRP) tendons have been emerged as thetimes require in recent years.Compared with the steel, FRP bars has high tensile strength, light weight, corrosionresistance and non-magnetic, thus widely used in civil engineering nowadays. Therefore, it isvery important to research the mechanical behavior of FRP. In this dissertation, the means ofsimulation analysis has been utilized to establish a finite element analysis model of T-sectionconcrete beam prestressed with CFRP tendons, from which gets a more in-depth research onmechanical properties of CFRP reinforcement concrete beam. The main work of thisdissertation can be summarized as follows:First, this dissertation introduces the type of FRP, the mechanical properties, theproduction technology, as well as the development status of prestressed FRP.Secondly, this dissertation introduces finite element method and the related analysissoftware. By selecting appropriate element type, material constitutive relations and failurecriteria of FRP tendons and concrete, the CFRP tendons prestressed of T-beams deepresearched in this dissertation are established. In order to verify the applicability of thesimulation analysis method, according to the the data of existing experiment, correspondingfinite element models are also established, from which the results of the load-deflection curve,cracking and ultimate loads compared, error analysis are all within the acceptable range.Based on the nonlinear numerical simulation, we get the analysis results of the impact of theCFRP ratio of reinforcement, non prestressed reinforcement ratio, concrete strength andeffective prestress by nonlinear numerical simulation.Finally, the bending mechanism of concrete beam prestressed with CFRP tendons areelaborated by analyzing prestressed FRP reinforced concrete beams sessions and severalfailure modes. According to the plane section assumption and static equilibrium, thisdissertation has obtained the calculating formula on balanced reinforcement ratio, crackingmoment, ultimate bending moment, short-term stiffness and deflection of T-section concretebeam prestressed with CFRP tendons, which was verified by the comparison of experimentand numerical simulation results. The contents of the dissertation involved may lay a certainfoundation of studying the mechanical properties of T-section concrete beam prestressed withCFRP tendons. Meanwhile, it also provides some reference value to the design strategies of concrete beam prestressed with CFRP tendons.