Flexural Properties Study On Concrete Continuous Beams With CFRP-PCPs Tendons

The CFRP tendons were the reinforced ideal alternative materials in reinforced concrete structure,due to its high tensile strength and to prevent the destruction of a series of problems caused by thestructure of the steel corrosion Extensive researches on the CFRP tendon were given attention by theuniversities and research technicians recently. However, due to its low elastic modulus, deflection anddeformation of reinforced concrete structures is beyond the requirements of the specificationprocedures before CFRP tendons achieve the desired tensile strength. With the prosperity of theconstruction market, the high-rise buildings and large-span structure is increasing, research on CFRPtendons has practical application value. In order to meet the needs of the building and take fulladvantage of the high tensile strength of the CFRP tendons, and to avoid deformation and other issuesgenerated CFRP reinforced concrete reinforcement, the “CFRP-PCPs composite bars (carbon fiberreinforced polymer prestressed concrete prisms)” is presented by this paper. The mechanicalproperties of the CFRP-PCPs composite bars were analysis and its models were simulate by nonlinearfinite element. Analyzing the theoretical, analysis simulation and the test data in the foreign languageliterature, when the CFRP-PCPs composite tendons in different prestressed, the length of the differentsizes and different high-performance concrete strength parameters transform non-linear finite elementsimulation. The results show that the cracking load varies with the level of increase of concretestrength increases; the ultimate load of the composite bar increases with the greater prestressed by theCFRP tendons applied; more than a certain length, cracking and ultimate loads little change, andcracks uneven distribution.Formulas of cracking moment and ultimate moment were given by mechanical properties of theconcrete continuous T-beam with CFRP-PCPs tendons if the theoretical and analysis simulation matchthe test data in the foreign language literature. The applicability and correctness of the formulas bytheory and finite element simulation were proving along with foreign test data. The results show thatthe theoretical analysis and calculation results, the simulation results are in good agreement with theexperimental results. Due to the only group of CFRP-PCPs composite rebar continuous beam test wasdone abroad, the results of simulation were analysis in the performance of different cross-section sizes,different effective prestress and concrete strength. The results show that the continuous T-beamsfailure when its mid-span reach ultimate load, and destruction of the specimen can be divided intothree stages, namely ordinary concrete cracking stage, continuous T-beams for the elastic stage,prestressed play a small role; high-performance of CFRP-PCPs composite bar concrete cracking stage,at this stage, the prestress can basically take fully functional; final stage is the stage of ultimate failure.Due to less cross-section reinforcement in the foreign test beam, the continuous T-beams failure bymid-span reinforcement pulled off. Simulation results show that the cracking load of continuousT-beams increases with ordinary concrete strength grade increases, but changes other parameter;ultimate load of continuous T-beams increases with high performance concrete strength gradeincreases increased, and increases with the applied prestress.