| The project of CFRP strengthen RC beams is an advanced reinforcement techniques, it has been widely used in civil engineering. But the technology still has some limitations, the general CFRP strengthen without prestressing force, to improve the RC beams in mechanical properties is limited, and its high-strength characteristics of the material can't be full played. If imposed the pre-stressed CFRP on the RC beams, which can significantly improve the bearing capacity and make the best use of carbon fiber sheet.At present, both at home and abroad, CFRP strengthen RC beams is still in infancy. No mature theory,construction equipment and techniques,and some key technical issues have not been effectively resolved. In related pilot study, more cross-section of the reinforcement has been researched, but it has few study in strengthen diagonal plane section. In recent years, with the development of CFRP strengthen study, many new methods of shear reinforcement emerged. In addition to the traditional methods to increase cross-section, but also sticky FRP, visco-plate and wire around the law emerged.In this paper, A systematic analysis and experimental study in CFRP reinforcement. First of all, we develop a new type of vitro-rotary tensioning prestressed anchor, use the anchor in our reinforcement experiment, which showed: use this anchor sthrengthen RC beams with pre-stressed CFRP, its process is easy and can be good make RC beams and carbon fiber sheets bonded together.In the test we use 5 RC beams of equal strength without web reinforcement, (shear ratio 2.27), with different methods in reinforce diagonal plane section. The test results shows that with the prestressed CFRP reinforcement,the RC beams mechanical behavior (cracking load, ultimate load, distribution and development of cracks, deflection, deformation capacity) was better than the beam without the prestressed CFRP reinforcement. In this paper, experimental data are closely agree with theoretical data results.
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