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Design for shear strength of concrete beams longitudinally reinforced with GFRP bars
Job Thomas,S. Ramadass 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.1
In this paper, a model for the evaluation of shear strength of fibre reinforced polymer (FRP)-reinforced concrete beams is given. The survey of literature indicates that the FRP reinforced beams testedwith shear span to depth ratio less than or equal to 1.0 is limited. In this study, eight concrete beamsreinforced with GFRP rebars without stirrups are cast and tested over shear span to depth ratio of 0.5 and1.75. The concrete compressive strength is varied from 40.6 to 65.3 MPa. The longitudinal reinforcementratio is varied from 1.16 to 1.75. The experimental shear strength and load-deflection response of the beamsare determined and reported in this paper. A model is proposed for the prediction of shear strength of beamsreinforced with FRP bars. The proposed model accounts for compressive strength of concrete, modulus ofFRP rebar, longitudinal reinforcement ratio, shear span to depth ratio and size effect of beams. The shearstrength of FRP reinforced concrete beams predicted using the proposed model is found to be in betteragreement with the corresponding test data when compared with the shear strength predicted using theeleven models published in the literature. Design example of FRP reinforced concrete beam is also given inthe appendix.
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