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Every year more than 1 million visitors travel the Nevada State Route 28 in the US; a two-lane, mountainside road that borders 11 miles of Lake Tahoe’s undeveloped shoreline.
With usage expected to double in the next 20 years, limited parking and lack of safe access spurred the Nevada Department of Transportation (NDOT) to initiate a design/build project that would support growing traffic yet protect the area’s fragile ecosystem.
The agency chose Composite Advantage’s fibre reinforced polymer (FRP) FiberSPAN system to help it meet the unique demands of constructing a shared-use path on the region’s rocky uneven slopes. “The scope of the project meant FRP had to take on a larger role in terms of performance,” says Scott Reeve, Composite Advantage President.
Each bridge span section was delivered as a prefabricated unit of steel beams, FRP deck and railing. “In most FRP bridge applications,” he explains, “the steel support beams or trusses provide the primary load carrying structure. But in this case we had to design FRP sections to act as the shear diaphragm for the stringers. We bonded the connection between the deck and steel beams with structural methyl methacrylate adhesive to permit complete shear transfer between the steel and FRP.”
Composite Advantage began prefabricating panels in 2017. The ability to prefabricate and assemble the superstructure at the supplier’s manufacturing facility allowed technicians to bond and mechanically bolt FRP panels to the steel for higher quality and reduced costs and minimise construction activities at the job site.
Thirty-two 40-foot bridge span sections were installed on an 11-mile section of the path. The spans were grouped to create five distinct bridges. “Our FRP pedestrian bridge deck system was used in areas where the slope was too steep to provide flat walking surfaces,” says Reeve.
FRP’s ability to accommodate a range of design variations, its’ 100-year life cycle and its capacity for use in difficult terrain make it an attractive option for projects like SR 28. “The response has been so positive that there are prospective plans to extend the path created by FRP pedestrian decking,” Reeve says. The NDOT and the Tahoe Transportation District opened the new Tahoe East Shore Trail in June.
Composite Advantage supplies innovative fibre reinforced polymer (FRP) products for major infrastructure markets. To create its engineered solutions, CA pairs progressive designs with its capability to mould large parts, perform on-site assembly, and support customer installations. The supplier has been developing lightweight, high-strength, cost-effective FRP goods for structurally demanding applications and corrosive environments since 2005. Many of these products have paved the way for first-time use of FRP composites in infrastructure, rail and water applications because of their performance attributes. The supplier’s comprehensive lineup includes bridge decks, trail bridges, cantilever sidewalks and rail platforms to fender protection systems, pilings, naval ship separators and other waterfront structures.
Image provided by Composite Advantage
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