Carbon Fiber Composites (cfrp) Reinforcement And Repair Of Concrete Structures Bending Performance Analysis

Strengthening of concrete beams with externally bonded Carbon fiber reinforced plastic(CFRP) materials appears to be a feasibe way of increasting the load-carrying capacity and stiffness characteristics of existing structures.CFRP strengthened cocrete beams can fail in involve steel yield-CFRP tenside rupture and steel yield - concrete crushing.Here we obtain the strain Compatibility method ande equilibrium of forces and concepts of fracture mechanincs, they can be used to predict the ultimats strength in flexure that can be achieved by such elements, given the CFRP cross - sectional area, or conversely, the required CFRP cross - sectional area to achieve a targeted resisting moment of rehabilitated flexureal elements.At the same time, parametric analyses are conducted to investigate the effects of CFRP on strengh, rigidity and failure mechanisms of repaired RC beams. Parameters considered are: concrete compressive strength, percentage of flexural reinforcement, bonded length, thickness and stiffness of CFRP laminate and soon.The paper summarizes the results of experimented and analytical studies concerning the flexural strengthening of repaired RC beams Even when considering the limitation of the Re member due to its un - modifiable shear resistance, it is shown that the applications of CFRP reinforcement can considerably increase untimate load resistance capacity and deflection at service.A step by step procedure is also presented along with an easy to use flow chart. Finally, a numerical design example is provided to demonstrate the applicability of the approach. It is believed to be useful for the practicing engineering.