Title: Shear-Transfer Mechanisms for Glass Fiber-Reinforced Polymer Reinforcing Bars

Author(s): Austin B. Connor and Young Hoon Kim

Publication: Structural Journal

Volume: 113

Issue: 6

Appears on pages(s): 1369-1380

Keywords: aggregate interlock; angle effect; composite reinforcement; glass fiber-reinforced polymer; shear-friction

DOI: 10.14359/51689034

Date: 11/1/2016

Abstract:
This paper proposes a shear-friction model for sand-coated glass fiber-reinforced polymer (GFRP) reinforcement. The proposed shear-friction model considers crack parameters, width, and slip, as well as the orientation angle of the reinforcing bar crossing the crack plane. A total of nine push-off tests were conducted to investigate the shear performance of two contributions: aggregate interlock and reinforcement. Main test variables include two types of reinforcement (steel and GFRP) and three different orientations (45, 90, and 135 degrees). Results indicate that width and slip along with the orientation of GFRP are critical design parameters to accurately quantify shear capacity provided by contributing mechanisms. Therefore, the performance of GFRP can be quantified as a function of crack parameters, which are larger in fiber-reinforced polymer (FRP)-reinforced systems. The proposed framework outlines the approach to develop a model to predict shear-transfer strength of FRP-reinforced concrete.