Abstract
As bridge deck slabs directly sustain repeated moving wheel loads, they are among the bridge elements most susceptible to fatigue failure. Recently, glass fiber-reinforced polymer (FRP) composites have been widely used as internal reinforcement for concrete bridge deck slabs because they are less expensive as compared to other kinds of FRPs (carbon and aramid). However, there is still a lack of information on the performance of FRP–reinforced concrete elements subjected to cyclic fatigue loading. This paper investigates fatigue behavior and fatigue life of concrete bridge deck slabs reinforced with glass FRP bars. A total of 5 full-scale deck slabs were constructed and tested under concentrated cyclic loading until failure. Different reinforcement types (steel and glass FRP), ratios, and configurations were used. Different schemes of cyclic loading (accelerated variable amplitude fatigue loading) were applied. Results are presented in terms of deflections, strains in concrete and FRP bars, and crack widths at various levels of cyclic loading. The results show the superior fatigue performance and longer fatigue life of concrete bridge deck slabs reinforced with glass FRP composite bars.
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