Analysis On Flexural Behavior Of Concrete Beam Reinforced With FRP Bars

As a traditional eminent building material, steel-reinforced concrete is widely using in modern structure. However, despite this, the problem of poor durability still exists in the steel-reinforced concrete structure in atrocious environment. For this reason, various countermeasures have been studied, but they didn't satisfy the requirement. From 1990's the FRP-tendon-reinforced concrete has become one of the researching hotspot and has been accepted in the in the field of civil engineering because of FRP tendon's preferable durability in corrosive environment and its high strength.Aimed at finding out theflexural behavior, six simple-supported beams reinforced with GFRP bars and five ones reinforced with CFRP bars have been tested in static load experiment. The ratio's effect on breaking modality was concerned in this experiment, involving the cracking load, the development of crack, the assuming plane sections remaining plane, load-deflection curve, the development of strain of FRP reinforcement, and ultimate load. Based on the experiment research, a method to calculate the bearing capacity is put forward involving the formula to calculate minimum ratio, the formula to calculate the anti-crack behavior and one to calculate the stiffness. Compared with the result of experiment, those formulas prove to be effective and accurate. Theory of bearing capacity of beam reinforced with FRP bars is based on stress of FRP bars. The paper analysis flexural behavior of beam reinforced FRP bars using index considering deformation behavior and bearing capacity. And the mthod to design beam reinforced with FRP bars should consider crack, stiffness and bearing capacity.There is another experimental study and theoretical analysis on flexural behavior of concrete beams prestressed with FRP reinforcement in this dissertation's.2 simple-supported beams reinforced with CFRP reinforcement and 2 simple-supported beams reinforced with GFRP reinforcement have been tested in static vertical load experiment. The ratio and the prestressing force of FRP reinforcement and steel reinforcement are concerned in experiment, and the cracking load, ultimate load, load-deflection curve, development of strain of FRP reinforcement, development of crack, and assuming plane sections remain plane are investigated. Based on this investigation, the characteristic of concrete beams presterssed with FRP reinforcement is obtained. The characteristic of concrete beams presterssed with FRP reinforcement is discussed in theoretical analysis. The formula to calculate load-carrying capacity and short-term stiffness of these beams is deduced. Compared with the result of experiment, these formulas are effective and accurate. Flexural behavior of concrete beam prestressed with FRP reinforcement is better than beam reinforced with FRP bars.By experimental study and theory analysis, the paper draw some conclusions. Concrete beam reinforced with FRP bars has good bearing capacity, and it's deformation capacity can meet the...