The Val-Alain Bridge is located in the Municipality of Val-Alain on Highway 20 East, and crosses over Henri River in Québec, Canada. The bridge is a slab-on- girder type with a skew angle of 20o over a single span of 49.89 m and a total width of 12.57 m. The bridge has four simply supported steel girders spaced at 3145 mm. The deck slab is a 225-mm thickness concrete slab, with semi-integral abutments, continuous over the steel girders with an overhang of 1570 mm on each side. The concrete deck slab and the bridge barriers were reinforced with sand-coated V-Rod GFRP composite bars utilizing high-performance concrete.
The deck slab was designed based on serviceability criteria. The crack width and allowable stress limits were the controlling design factors. The MTQ has selected to limit the maximum allowable crack width to 0.5 mm and the stresses in the GFRP bars to 30 and 15 percent of the ultimate strength of the material under service and sustained loads, respectively. Based on this design approach, the bridge deck slab was entirely reinforced with two identical reinforcement mats using No. 19 GFRP bars. For each reinforcement mat, No. 19 GFRP bars spaced at 125 and 185 mm in the transverse and longitudinal directions, respectively, were used. A 40 and 35 mm top and bottom clear concrete cover, respectively, was used. Additional No.19 GFRP bars spaced at 250 mm were placed in the top transverse layer at the two cantilevers, as well as in the top longitudinal layer at the ends of the deck slab.
The bridge was constructed in 2004 and was well-instrumented at critical locations to record internal temperature and strain data. The bridge was tested for service performance as specified by the CHBDC using two four-axle calibrated trucks (Benmokrane et al., 2005).
The Val-Alain bridge is the Canada’s first concrete bridge deck totally reinforced with GFRP bars with an expected service life of more than 75 years.
© «Reinforcing Concrete Structures with Fiber Reinforced Polymers» by ISIS Canada