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Title |
An xperimental Study on the Effective Strain of Reinforced Concrete Beams Strengthened by Fiber Reinforced Polymer
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Keywords |
FRP ; 섬유의 유효변형률 ; 전단 강도 ; 파괴모드 fiber reinforced polymer(FRP) ; effective strain of FRP ; shear strength ; failure modes |
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Abstract |
The shear failure modes of FRP strengthened concrete beams are quite different to those of the beams strengthened with steel stirrups. When the beams are externally wrapped with FRP composites, many beams fail in shear due to concrete crushing before the FRP reaches its rupture strain. In order to predict the shear strength of such beams, the effectivestrain of the FRP must be known. This paper presents the results of an experimental study on the performance of reinforced concrete beams externally wrapped with FRP composites and internally reinforced with steel stirrups. The main parameters of the tests were FRP inforcement ratio, the type of fiber material (carbon or glass) and configuration (continues sheets or strips). The experimentally observed effective strain of the FRP was compared with the strain calculated using a proposed method.
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