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Abstract One of the techniques developed during the last decade for flexural strengthening of reinforced concrete RC beams was the use of fiber reinforced polymer FRP plate externally bonded to the tension face.With the addition of FRP reinforcement, beams exhibit several unique failure modes under flexural loading: rupture of a FRP plate, concrete cover separation and plate end and intermediate interfacial de-bonding of a FRP plate. Flexural strengthening of reinforced concrete beams using the carbon fiber reinforced polymer (CFRP) material has been examined by many researchers and it was shown to be an effective means of strengthening.Using different types of carbon fiber with different length to support preloaded beams was shown rarely in researches so the research shows the different in using different types of carbon fiber with different length |