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External prestressing is one of the most effective methods for repairing and strengthening the existing buildings. The topic of externally prestressed reinforced concrete box girder in a series of tests carried out research and analysis.This article is in the prestressed reinforcement technology research results further on in vitro testing of prestressed reinforced concrete box girder, in this paper, Experimental and theoretical analysis using the method of combining, Studied at home and abroad in the analysis of data, designed specifications and related documents on the basis of in vitro mechanical properties of prestressed reinforcement mechanism and conducted in-depth study.This experiment was designed five concrete box girder, In which a beam a pre-split, Then reinforced , The remaining four beam reinforcement and then proceed to load . The test carried out by static loading test box girder, Test beam study of the force and failure modes, Analysis of externally prestressed structure, performance, and influencing factors. Failure modes of test beams, mechanical process, load - deflection curve, incremental, etc. External Tendons carried out a detailed analysis.The beam test results and theoretical calculations to compare. Researched and analysised the different initial conditions of the test beam by the force of the mechanical properties ,and Combined with the existing domestic and external prestressing tendon stress increment calculation method of comparative study, to provide guidance for engineering design.The size of the test sample is very limited, many of the key factors of the trial can not be reflected in the testing process, the analysis of the experimental data is also difficult to obtain conclusions. So the use of finite element analysis software ANSYS simulation of the test box for analysis, to supplement the lack of testing. ANSYS to establish the reliability of the model used can be verified by testing, and software simulation of the formation of a complementary relationship of mutual support.In this experiment could not be reflected in the key factors, including concrete grade, external tendons position relative to the box, ordinary steel reinforcement ratio, the standard box girder span, the size of effective control of stress, the use of finite element analysis software simulation results obtained, these factors can be analyzed on the beam obtained overall force performance. This use of external prestressing reinforcement box technology theoretical and experimental research provides a rich theoretical guidance, it is beneficial for in vitro mechanical properties of prestressed reinforcement mechanism and a more in-depth study.
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