2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Effects of Staggering on the Splice Strength of Bundled GFRP Bars in Concrete

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Author(s)
Dr. Brahim Benmokrane, Universite de Sherbrooke (Presenter)
Dr. Ahmed Farghaly, University of Sherbrooke
Dr. Abolfazl Eslami
Mr. Alireza Asadian, University of Sherbrooke
Abstract

While bundling of reinforcing bars is inevitable in practice, the use of bundled glass-fiber-reinforced-polymer (GFRP) bars in RC members has been limited due to the complexity of staggering and the scarcity of design provisions in the major international design codes. This dearth of design provisions is mainly attributed to the lack of experimental data on the lap splicing of bundled GFRP bars. Therefore, this study was undertaken to investigate the splice strength of bundled GFRP bars in concrete under tension. Six full-scale beams with different staggering patterns (staggered and non-staggered) and number of bars in bundle (single, two- and three-bar bundles) were tested under a monotonically increasing load using a four-point bending setup. The beams had a total length of 5200 mm, a clear span of 5000 mm, a shear span of 1250 mm, and a constant-moment span of 2500 mm. Moreover, the gross cross-sectional area of all beams was 300×450 mm. The test results indicated that staggering had a noticeable effect on the bond strength of the three-bar bundle, although it had insignificant effect on the splices of single and two-bar bundles. Moreover, the bond strength was found to be dependent on the number of bars within a bundle as the splice strength was reduced by increasing the number of bundled bars.