| The corrosion of steel rods is always an important subject of the traditional structure of reinforced concrete, a effective method to deal with the problem of corrosiveness is to replace the steel rods by the FRP (fiber reinforce plastic) rods, including the GFRP bars.Comparing with the steel rods, the GFRP rods have good corrosive-resistant property, high-tension strength, lightweight and the similar thermal expansive coefficient with the concrete. But its elastic modulus is only about one-fifth of the steel bars. At present time, many mechanics performances of the GFRP bars are remains uncertain and the instruction of design is rare. This paper is deal with some mechanical experiences and theory researches of GFRP rods concrete beams.(1) Assuming that the GFRP rods is transversely isotropic material. Derive the micro-mechanical model of splitting failure in concrete reinforced with GFRP rods. Analysis the stress and its distribution of the cracked concrete around the GFRP rods, finding the relations of the number of cracks and the crack radius and the stress around the interface of concrete and GFRP rods.(2) The properties of GFRP reinforced polymer concrete beams and prestressed polymer concrete beams are tested by four point bending experiments, the result show: GFRP rods can be satisfied the stiffness request; it's very necessary and effective to use prestressed beam to minish the defection, enhance the crazed load and reduce the width of the cracks.(3) Modifying the experienced formula ACI 318-2002 which used to forecast the displacement of the steel rods reinforced cement concrete, receive a formula to forecast the displacement of GFRP rods reinforced polymer concrete beams after crazed.(4) Using the numerical method of finite element to simulate the loadingprogress of GFRP rods reinforced polymer concrete beam, the result show thatthe material model and constitutive relation play an important role in receive a accurate solution.
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