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BCTUSBDU: In this paper, the carbon fiber reinforced plastic (CFRP) bars were used as the reinforcement at the tensile side of RC beams. There were three different types of the main tensile reinforcement arrangement in the RC beams with shear steel stirrups. For the three different types of the main reinforcement arrangement, there were one, two and three rebars placed at the tensile side of reinforcement with the sizes of D16 steel rebars and the CFRP bars. Moreover, the sizes of D10 CFRP bars were used in the experiment. All the RC beam specimens with steel rebars and CFRP bars were bending failure. The results of RC beams with steel rebars and CFRP bars were compared in deflection and in rebar strain of FEM results at maximum flexural strength. Comparing the maximum experimental flexural strengths with the FEM results, the RC beam specimens with steel rebars were greater than the FEM results in average. Similarly, the RC beam specimens with CFRP bars were greater than the FEM results in average also. From the FEM results, the yielding strain of steel rebar was reached before the failure of RC beams for all three types of RC beams with steel rebars. Moreover, from the FEM results of the RC beam with CFRP bars, the CFRP tensile strength was reached before the failure of RC beams for the one and two CFRP bars placed at the tensile side. However, for the three CFRP bars placed at the tensile side, the failure of RC beams was before the CFRP tensile strength was reached. As seen from the experimental and FEM results, the load-deflection relationships of both results were coincident to each other.

THE FINITE ELEMENT ANALYSIS ON STEEL REBARS AND CFRP BARS USED AS THE MAIN REINFORCEMENT IN RC BEAMS