Field performance of an FRP slab bridge

Abstract

Fiber reinforced polymer (FRP) composite decks are new to bridge applications and hence not much literature exists on their in-service performance. The in-service performance, and impact and dynamic characteristics of the first fiber reinforced polymer composite bridge superstructure built in New York State in late 1998 are documented in this paper. Test data indicate that the superstructure and the shear-key are structurally performing well. The average impact factor was about 0.3. Observed low strains and deflections, compared to those predicted at the design stages, show room for optimization of the deck design to make these more cost-effective in the future. Higher modal damping values were observed and reflect the vibration absorbing capacity of FRPs. Several delaminations were found during visual inspections and the wearing surface was replaced once. For future applicability of FRPs for bridge deck applications, these issues affecting the long-term durability should be resolved.