Title: Full-Depth Threaded GFRP Rods for Enhanced Bond Performance
Author(s): Donna Chen and Raafat El-Hacha
Publication: Symposium Paper
Appears on pages(s): 20.1-20.18
Keywords: mixed-mode, bond, finite element, Glass Fiber Reinforced Polymer, Ultra-High-Performance Concrete
Experimental and analytical investigation into the performance of a special bond system was conducted on small-scale mixed-mode bending (MMB) specimens for implementation in a full-scale hybrid bridge deck system. Full-depth threaded Glass Fiber Reinforced Polymer (GFRP) rods, as a proposed replacement for commonly used GFRP shear studs, in conjunction with an epoxy bonded coarse silica sand aggregate layer, were used at the bond interface between a pultruded GFRP plate and cast-in-place Ultra-High Performance Concrete (UHPC). Findings show that the presence of the threaded GFRP rods increased the strength of the system up to 250% while utilizing 25% of the rod capacity. The full potential of full-depth threaded GFRP rods for bond and crack control can be explored in greater detail in future studies, including the application of nut tightening forces to increase initial clamping forces at the bond interface.