Simulation Research On The Mechanical Behavior Of Concrete Continuous Beams Prestressed With FRP Tendons Based On ANSYS

FRP tendons have many advantages of its high strength, light weight and corrosion resistance, making it more and more applicable in the field of engineering. It has not only higher tensile strength but also has strong corrosion resistance and anti-magnetic than the steel strand.So it can replace ordinary steel strand to improve the corrosion resistance of member, and can be used in specific environment. Therefore, the studies of FRP bars used in the bridge are more and more in-depth.This paper concentrates on the mechanical performance of FRP continuous beam under different loads, the main contents are as follows:1、First, the characteristics and research status of FRP bars were introduced, followed by the application in bridge engineering.Then, ANSYS numerical simulation based on existing test model was built to verify the practicality and accuracy of ANSYS numerical simulation.2、Second, the calculation methods of critical reinforcement ratio and crack was simply introduced. ANSYS was used for parametric analysis of FRP-PC test beams, the intensity of factors which we studied in this paper including FRP tendons ratio and tensioning control stress, non-prestressed reinforcement ratio, concrete strength and type and composition of FRP tendon. The regular pattern of the flexure behavior of test beams under the factors affect was summarized after comparing the carrying capacity, limit deflection, crack widths and ductility index of beams in each group,making certain recommendations for the design of FRP-PC continuous beam.3、For statically indeterminate structure, moment redistribution influence can’t be ignored when design a structure, in this paper, the size of the moment redistribution coefficient in different beams which have different types of tendons was compared, and the relationship between distribution coefficient and ductility size was be analyzed. Found FRP-PC continuous beam has a certain ability of internal force redistribution.