The Skovdiget bridge north of Copenhagen, Denmark opened in 1965 and is part of a main route for urban traffic, which is also used for heavy loads. The bridge carries the busiest highway in Denmark with app. 60000 daily passengers over the S-train line with app. 6000 daily passengers. The superstructure in the western bridge is severely deteriorated in critical positions, while at the same time facing an increased traffic load. The main girders are therefore under surveillance in order to follow the effect of the replacement of the water protection and drainage, while at the same time following the corrosion rates in the critical parts of the structure. The variations of the strains are at the same time logged, in order to generate a realistic statistic of the load variations and frequencies as well as provide a control of the FEM-modelling.

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