Nonliner Finite Element Analysis Of Concrete Number In Bending With Prestressed FRP Tendons

To resolve the problem of rebar corrosion, experts have found that ,in many years' study, the application of Fiber Reinforced Plastic (FRP) tendons proved to be best dependable measure in present time. Fiber reinforced plastic (FRP) tendons, a new advanced composite material, is formed through pultrusion of epoxy-impregnated reinforced fibers. FRP tendons have many advantages such as lightweight, high strength, corrosive resistance, fatigue resistance, and so on. When used in the concrete structure, it is not very safe and do not make full use of materials strength result in overreinforced failure. So we pay attention on the application of prestressing FRP tendons using in the prestressed concrete structures.Although,there are many differences between prestressed concrete components with prestressing FRP tendons and prestressed concrete components because of tensile stress-strain curve and low young's modulus of FRP tendons. So we make research on mechanical property and calculation method of prestressing FRP tendons.Based on predecessor theory and experimental study foundation, has carried on the research to the prestressed concrete number in bending with prestressed FRP tendons,the paper focuses on following items :1. Using commercial finite element software, ANSYS, nonliner finite element simulation of prestressed concrete beams with unbonded prestresseing CFRP tendons is accomplished. It is modeling method, selecting element, defining constitutive relationship of materials and solution method that are elaborated on in this paper, and then reliability of methods as mentioned above is testified by compared with experiment results.2. Research on the influences factors on bearing behavior of prestressed concrete beam with unbonded prestressing FRP tendons. Using the model to conduct parametric study, we can get the main factors are effective prestress and strength of concrete.3. It shows that we can calculate the bearing capacity of prestressed concrete beams with prestressing FRP tendons using standard method of unbond prestressed concrete beams though analyzing of test beams.