BEHAVIOR AND DESIGN ASPECTS OF CONCRETE BEAMS REINFORCED WITH HYBRID STEEL-GFRP BARS

Document Type : Original Article

Author

Civil Engineering Department, Faculty of Engineering, Minoufiya University, Egypt

Abstract

This paper aims at investigating the structural behavior of simply supported concrete beams reinforced with hybrid reinforcement consisting of steel and glass fiber reinforced polymer (GFRP) bars. The proposed system utilizes the merits of ductility and stiffness provided by the steel reinforcement and the anticorrosion characteristics of GFRP. While, the steel bars were provided with an increased concrete cover to ensure extra protection against corrosion, the GFRP bars were laid near the bottom tension surface of test beams to control cracking. Different parameters influencing the structural behavior including the steel and the GFRP reinforcement ratios and the configuration of shear reinforcement were considered. The steel stirrups were used to confine only the elevated steel bars or to confine both the steel and the GFRP bars. A total of twelve beams were tested in flexure under four-point loading till failure. The load-deflection response, the cracking patterns and the failure modes were recorded. A design equation was proposed to predict the ultimate load of the hybrid test beams. The test results showed that the performance of the proposed system was successful in maintaining the flexure strength with adequate stiffness and improved the cracking characteristics compared to counterpart beams with conventional reinforcement.

Keywords

ERJ. Engineering Research Journal
Volume 35, Issue 2
April 2012
Pages 139-147

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