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The purpose of this study is to evaluate the flexural behavior of concrete beam members with longitudinal Fiber Reinforced Polymer(FRP) rods. A cold and saltish environments deteriorate reinforcement of reinforced concrete structures. To avoid such deterioration, the FRP rods are used in place of steel reinforcements. In this study, 8 concrete beam specimens longitudinally reinforced with FRP rod and steel bar are tested. The parameters of the specimen are the sectional area of reinforcement, the tensile force of longitudinal, and the type of longitudinal reinforcements. Experimental results are investigated in aspect of failure pattern and load-displacement relationship, moment-curvature relationship, load-longitudinal bar strain, and load-crack width. And the moment-curvature relationships are compared with the analytical results. The experimental and analytical results show that the concrete beams reinforced with FRP rod have the larger crack space, crack width, and the higher maximum load than the concrete beams reinforced with steel because of the low modulus of elasticity and the high tensile strength of FRP rod. Also, in comparison with moment-curvature relationship, analytical results are in accordance with experimental results.