Analysis Of The Resistence Capacity Of The Reinforced Concrete Beams Strengthened With CFRP And The Stress Concentration At The Plate End

The characters of Carbon Fiber Reinforced Plate(CFRP), the construction technique of reinforcing concrete structures with it, the theory-developing and the practical application about it are all introduced in this article according to the material in the world.The characters of the load are described when the concrete beams are strengthened with CFRP. According to the beam's character of secondary load, this article theoretically analysis the flexural resistance capacity of the strengthened beams. The relation between the strain, stress, stiffness of the beams and the load is described. The author also analyzes and describes the factors that affect the resistance capacity of the strengthened beams.After the concrete beams are strengthened with CFRP, there is stress concentration at the end of CFRP. This is the major reason of the strengthening failure. This article theoretically analyzes the stress concentration at the area of plate end, calculates the values of the stress with the software of ANSYS and gets the distributing curves of the stress at this area. Some suggestions about the anchorage are proposed in this article according to the calculating result.The methods of shear strengthening of reinforced concrete beams with CFRP are described in this article. The ways of shear-destruction of the beams, the factors affecting shear resistance capacity, the developing of stress are also introduced. According to the characters of shear destruction, this article analyzes the calculation method of beam's shear resistance capacity and proposes some suggestions about how to increase the effect of shear strengthening.