关键词: CFRP布;预应力钢绞线;加固;弯曲性能

Abstract: 3 test beams through the scale model which was based on the prestressed reinforced concrete beam in the construction of a highway in China was designed .The effects of CFRP ( Carbon Fiber Reinforced Plastics ) sheet reinforcement and prestressed steel strand reinforcement on the bending performance of bridge were studied , through analyzing the changes of the limit bearing capacity of girders, the deflection of the beam body , the strain of concrete , reinforcement and reinforcing materials , the number and development of cracks . The results show that: CFRP sheets reinforcement and prestressed steel strand reinforcement can improve the bearing capacity of beams effectively ;CFRP sheets reinforcement can limit the development of cracks by disperse the tensile stress of concrete .Prestressed steel strand reinforcement can bind the bending of the beam obviously , as well as reduce the deflection effectively .

Key words: CFRP sheet;prestressed steel strand;reinforcement;bending performance