Study On Flexural Behavior Of Concrete Beam Prestressed With FRP Tendons

Because of the weak corrosion resistance of prestressed reinforced, the structuredurability has been displaying a series of questions. In order to solve this situation, thefiber-reinforced polymer (FRP) tendons have been emerged as the times require, as thealternative products to the steel reinforcement in recent yeas. There are three kinds of FRPused in civil engineering: CFRP (Carbon FRP), GFRP (Glass FRP), AFRP (Aramid FRP).Because FRP can offer improved corrosion resistance compared to steel, they will be widelyused in civil engineering.In this dissertation, the means of simulation analysis has been utilized to establish ameticulous finite element analysis model, and according to comparing with the experimentaldata, it obtained the correct finite element model. By modifying the initial parameters in themodel, this dissertation has received the main factors affecting the flexural behavior ofconcrete beam prestressed with AFRP tendons. The main work of this dissertation can besummarized 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 introduced the finite element analysis theory, at the same time,it also made a presentation on the type of unit and material properties which should beselected in the modeling process. Simultaneously, a detailed description of applied simulationmethod for prestressed and the problems existing in the modeling process also have beenillustrated in this dissertation. By simulating to the experimental data, this dissertation hasestablished the finite element model, as well as compared the load-deflection curve and straincurve of prestressed with AFRP tendons, it has received the errors within the acceptable rangewhich fully verified the accuracy of the model. In addition, the simulation also obtained thedetailed experimental data which were difficult to receive on the experiment. Therefore, it canhelp us to further understand the mechanical characteristics of beam prestressed with AFRPtendons. Additionally, this dissertation has studied the main factors affecting the deflectionand ultimate bearing capacity of concrete beam prestressed with AFRP tendons.Finally, according to the characteristics of the AFRP tendons, based on the analysis of thefailure mechanism on concrete beam prestressed with AFRP tendons, referenced its formulathat how to calculate the carrying capacity of concrete beam prestressed with AFRP tendons,and based on the plane section assumption and static equilibrium,this dissertation hasobtained the Calculating Formula on ultimate flexural capacity of concrete beam prestressed with AFRP tendons.