2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference


Title
Size Effect on the Shear Strength of High-Strength Concrete Continuous Beams Reinforced with GFRP Bars


Author(s)
Dr. Karam Mahmoud, University of Manitoba (Presenter)
Dr. Ehab El-Salakawy, University of Manitoba
Abstract

~~The use of the non-corrodible fiber reinforced polymer (FRP) bars as main reinforcement for concrete structures to overcome the steel corrosion problem is exponentially increasing. The FRP bars, as longitudinal reinforcement, made the size effect on shear strength more pronounced than that in steel-RC beams. This effect was more significant in beams made of high strength concrete and with small longitudinal reinforcement ratio. This study evaluates the size effect on shear capacity of continuous high-strength concrete beams reinforced with glass (G) FRP bars. The experimental results of six large-scale continuous concrete beams are presented. The test beams had a rectangular cross section of 200 mm width and three different effective depths of 250, 500 and 750 mm. The beams were continuously supported over two equal spans of 2,800, 3,750 and 5,250 mm for beams with depth of 250, 500 and 750 mm, respectively. The test variables were the effective depth of the beam and the longitudinal reinforcement ratio. The test results showed that significant size effect was observed with increasing the effective depth in beams failed in the exterior shear span. The opposite was observed in beams failed in the interior shear span where the shear strength increased when the depth increased. Test results also were compared to the predictions of shear design provisions in the CSA/S806-12 standard and the ACI 440.1R-06 guidelines.