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Structural Engineering and Mechanics
  Volume 53, Number 1, January10 2015, pages 41-55

Design for shear strength of concrete beams longitudinally reinforced with GFRP bars
Job Thomas and S. Ramadass

    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 tested with shear span to depth ratio less than or equal to 1.0 is limited. In this study, eight concrete beams reinforced with GFRP rebars without stirrups are cast and tested over shear span to depth ratio of 0.5 and 1.75. The concrete compressive strength is varied from 40.6 to 65.3 MPa. The longitudinal reinforcement ratio is varied from 1.16 to 1.75. The experimental shear strength and load-deflection response of the beams are determined and reported in this paper. A model is proposed for the prediction of shear strength of beams reinforced with FRP bars. The proposed model accounts for compressive strength of concrete, modulus of FRP rebar, longitudinal reinforcement ratio, shear span to depth ratio and size effect of beams. The shear strength of FRP reinforced concrete beams predicted using the proposed model is found to be in better agreement with the corresponding test data when compared with the shear strength predicted using the eleven models published in the literature. Design example of FRP reinforced concrete beam is also given in the appendix.
Key Words
    shear strength; GFRP; concrete deep beams; shear span to depth ratio; size effect
Job Thomas and S. Ramadass: Division of Civil Engineering, School of Engineering, Cochin University of Science and Technology, Kochi, Kerala, PIN 682022 India

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