Punching Shear Behavior of Glass Fiber-Reinforced Polymer-Reinforced Concrete Slab-Column Interior Connections

摘要

This paper deals with punching shear behavior of flat plates reinforced with glass fiber-reinforcedpolymer (GFRP) reinforcing bars. Six full-scale reinforced concrete (RC) slab-column interior connections were constructed and tested to failure. Two variables were investigated; the flexural reinforcement ratio when high-strength concrete (HSC) is used and the type of GFRP shear reinforcement (headed studs and corrugated bars) when normal-strength concrete (NSC) is used. All specimens were tested under concentric shear force and unbalanced bending moment with a constant moment-to-shear ratio. Increasing the reinforcement ratio increased punching capacity and post-cracking stiffness for HSC connections. Both types of shear reinforcement increased the punching capacity and deflection of NSC connections. Test results were compared with the predictions of the available fiber-reinforced polymer (FRP) design provisions in North American codes.