VFT-WIB-Brücke bei Vigaun

VFT-WIB viaduct in Vigaun – a composite bridge with external reinforcement.

With theintroduction of the composite dowel the possibility is given to develop new constructionmethods for bridges. The VFT-WIB construction method is used for the first time for theroad bridge in Vigaun/Austria, which is in service since autumn 2008. The cross-sectionis composed out of two prefabricated elements with halved rolled girders, working asbottom flange. The composite dowels are manufactured by cutting the rolled girder intotwo halves with a special cutting-line. These halved girders work as external reinforce-ment, which leads to very slender and economical composite structures. Below detailsabout the planning process, the design and the construction process of 78 m long threespan framing bridge over the railway line from Salzburg to Wörgl are shown.