Experimental Study On The Behavior Of The Strengthened RC Flexural Member Bonded With CFRP Boards

The use of fiber reinforced plastics (FRP) in civil engineering is a hot topic in research and development of the international civil engineering area. The technology of using carbon fiber reinforced plastics (CFRP) on strengthening and repairing concrete structures is the most extensive one in research, development and application.In this paper, based on the experiment of nine simply supported beams and three prestressed hollow slabs strengthened with CFRP boards , failure modes of the flexural members strengthened with CFRP boards were studied ; the carrying capacity, stiffness and distributing of cracks of the flexural members strengthened with CFRP boards were also analyzed . The hypothesis of plane section was also verified by the experiment. The CFRP bonding scheme and quantity for the specimens were examined. A simplified design formula was proposed. The analyzed result indicated , that the flexural strength of RC flexural member couldbe markedly increase; and the flexural stiffness of the ordinary RC beam was also markedly increased, but not to the prestressed hollow slab. The configuration of crack in the beam's bottom could be markedly improved. Based on the nonlinear theoretics, a nonlinear method is used to analyze the whole deformation course of RC beam reinforced by carbon fiber reinforced plastics board was proposed, and a computer analysis program was developed. The result of this analytical method can meet the result of experiment. At last, the summarizing of this paper was developed and proposed other main problems that will be studied in the future.