Shear Strength of Concrete Beams Reinforced with FRP Bars: Design Method


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Title: Shear Strength of Concrete Beams Reinforced with FRP Bars: Design Method

Author(s): A.K. El-Sayed, E.F. El-Salakawy, and B. Benmokrane

Publication: Special Publication

Volume: 230


Appears on pages(s): 955-974

Keywords: axial stiffness; beams; concrete contribution; design method; FRP bars; shear strength

Date: 10/1/2005

ACI Committee 440 has proposed a design approach for evaluating theconcrete contribution to the shear resistance of FRP-reinforced concrete beams thataccounts for the axial stiffness of FRP longitudinal reinforcement. Recent shear testsconducted on beams longitudinally reinforced with different types and ratios of FRPbars indicate that the current ACI 440.1R-03 shear design approach significantlyunderestimates the concrete shear strength of such beams. This paper presents aproposed modification to the ACI 440.1R-03 shear design equation. The proposedequation was verified against experimental shear strengths of 98 specimens tested todate, and the calculated values are shown to compare well. In addition, the proposedequation was compared to the major design provisions using the available test results.Better and consistent predictions were obtained using the proposed equation.