Abstract
This study compares the behavior of slab-column connections reinforced with steel or glass fiber-reinforced polymers (GFRP). The effects of concentrating the reinforcement in the immediate column region and the influence of using steel fiber-reinforced concrete (SFRC) in the slab were also studied. The punching shear capacity, stiffness, ductility, strain distribution, and crack control were investigated. Concentrating the slab reinforcement and the use of SFRC in the slab enhanced the punching behavior of the slabs reinforced with GFRP bars. Predictions using different design guidelines are compared to the experimental results obtained from the FRP reinforced slabs tested in this study and those tested by other researchers. Results show that the GFRP-reinforced slabs have significantly lower punching shear capacities, lower post-cracking stiffness and greater deflections than slabs reinforced with steel reinforcing bars. Concentrating the top mat of flexural reinforcement results in beneficial effects on punching shear strength, postcracking stiffness, and crack control. The presence of 0.5% by volume steel fibers in the concrete significantly improves punching shear capacity and crack control.
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