Several codes and design guidelines have been recently published, which allow the use of FRP bars as main reinforcement for concrete structures including bridge deck slabs and girders. However, due to the relatively low modulus of elasticity and small transverse strength of FRP bars, especially GFRP, the overall shear capacity of concrete members reinforced with FRP bars as flexural reinforcement is lower than that of concrete members reinforced with the same amount of steel. Since it is less expensive than other kinds of FRP (Carbon and Aramid), glass FRP composite reinforcement (GFRP, commonly, consists of glass fibers impregnated in a vinyl ester resin) is more attractive to the infrastructure applications and the construction industry. ĭue to their non-corrodible nature, fiber reinforced polymer (FRP) composites have been investigated by researchers as suitable reinforcement for concrete structures to overcome corrosion related problems. Consequently, fatigue performance is an important limit state that must be considered by designers of bridge decks,. Since bridge deck slab directly sustains repeated moving wheel loads, it is one of the most bridge elements susceptible to fatigue failure. Due to the lateral restraining action exerted by the supporting girders and the continuity of the slab, compressive membrane forces develop and the deck slab behaves like a dome and fails ultimately by punching shear.
After the cracking of the deck slab, it is well established that deck slabs (having a span-to-depth ratio ⩽ 15) resist traffic loads through arching action. The slab-on-girder superstructure is one of the most common structural systems used for North American highway bridges.
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