Shear Strength of Large Concrete Members with FRP Reinforcement |
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Authors: | Evan C Bentz Laurent Massam Michael P Collins |
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Affiliation: | 1Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 George St., Toronto, ON, Canada M5S 1A4 (corresponding author). E-mail: bentz@ecf.utoronto.ca 2Associate Lawyer, Gowling LaFleur Henderson LLP, 100 King Street West, Suite 1600, Toronto, ON, Canada M5X 1G5. E-mail: laurent.massam@gowlings.com 3University Professor and Bahen-Tanenbaum Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 George St., Toronto, ON, Canada M5S 1A4. E-mail: mpc@civ.utoronto.ca
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Abstract: | Increasing interest in the use of fiber-reinforced polymer (FRP) reinforcement for reinforced concrete structures has made it clear that insufficient information about the shear performance of such members is currently available to practicing engineers. This paper summarizes the results of 11 large shear tests of reinforced concrete beams with glass FRP (GFRP) longitudinal reinforcement and with or without GFRP stirrups. Test variables were the member depth, the member flexural reinforcement ratio, and the amount of shear reinforcement provided. Results showed that the equations of the Canadian CSA shear provisions provide conservative estimates of the shear strength of FRP-reinforced members. Recommendations are given along with a worked example on how to apply these provisions including to members with FRP stirrups. It was found that members with multiple layers of longitudinal bars appear to perform better than those with a single layer of longitudinal reinforcing bars. Overall, it was concluded that the fundamental shear behavior of FRP-reinforced beams is similar to that of steel-reinforced beams despite the brittle nature of the reinforcement. |
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Keywords: | Reinforced concrete Fiber reinforced polymer Shear resistance Shear strength Model verification |
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