Title: Experimental Behavior of Concrete Corbels Reinforced with Glass Fiber-Reinforced Polymer Headed-End Bars

Author(s): Matthew N. Allen and Ehab F. El-Salakawy

Publication: Structural Journal

Volume: 121

Issue: 3

Appears on pages(s): 231-243

Keywords: code provisions; corbel; diagonal cracking; glass fiberreinforced polymer (GFRP); headed bars; reinforced concrete (RC); secondary reinforcement; shear strength; strut-and-tie

DOI: 10.14359/51740491

Date: 5/1/2024

Abstract:
Glass fiber-reinforced polymer (GFRP) reinforcement is a proven noncorrodible alternative to conventional steel reinforcement. Over the past two decades, a deliberate effort has been put toward developing a comprehensive set of design provisions, culminating in the release of ACI CODE-440.11-22. Absent from this Code is the strut-and-tie method commonly used in short shear-span applications due to uncertainty in GFRP-reinforced concrete (RC) behavior. Corbels are short shear-span, shear-controlled elements used to transfer vertical and horizontal loads to columns or walls. This study presents the results of 10 full-scale corbel specimens with varying reinforcement ratios and shear span-depth ratios to better understand the behavior of GFRP-RC corbels under monotonic loading. The results indicate that the cracking behavior, strain development, deflection, capacity, and mode of failure are all dependent on the presence of secondary reinforcement and the shear span-depth ratio. The thermoplastic headed-end bars used were found to be a viable anchorage method.