Does the Use of FRP Reinforcement Change the One-Way Shear Behavior of Reinforced Concrete Slabs? |
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Authors: | N A Hoult E G Sherwood E C Bentz M P Collins |
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Affiliation: | 1Research Associate, Dept. of Engineering, Univ. of Cambridge, Trumpington St., Cambridge, UK CB2 1PZ. E-mail: neil.hoult@gmail.com 2Assistant Professor, Dept. of Civil and Environmental Engineering, Carleton Univ., 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6. E-mail: Ted_Sherwood@carleton.ca 3Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON Canada M5S 1A4. E-mail: bentz@ecf.utoronto.ca 4Univ. Professor and Bahen-Tanenbaum Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto ON, Canada M5S 1A4. E-mail: mpc@civ.utoronto.ca
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Abstract: | For members with no transverse reinforcement, numerous models have been proposed for determining shear capacity, most often based on a statistical curve fit to experimental beam test results. The shear provisions of the Canadian code (CSA) for steel-reinforced concrete, by contrast, are based on a theoretical model, the modified compression field theory. This paper demonstrates that the CSA shear provisions for steel-reinforced members can be safely applied to members with internal fiber-reinforced polymer (FRP) bars by adjusting the term EsAs in the method to ErAr. A database of 146 shear failures of specimens reinforced with carbon, glass, or aramid FRP or steel is presented and gives an average test to predicted ratio of 1.38 with a coefficient of variation (COV) of 17.2%. The CSA code equations were optimized for the typical strain range of steel-reinforced concrete and when an equation appropriate for the wider range of strains associated with FRP is used, then a better statistical result can be achieved. Application of this expression to the database resulted in an average test to predicted strength ratio of 1.15 with a COV of 14.9%. As both methods are based on a theoretical shear model that was derived for steel-reinforced concrete and since both methods work safely, it can be concluded that the use of internal FRP bars does not change the one-way shear behavior of reinforced concrete beams and slabs without stirrups. |
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Keywords: | Concrete reinforced Fiber reinforced polymers Shear resistance Model verification Concrete slabs |
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