New Pedestrian Overpass at Husum Station

This paper presents the design of a potentially dynamic sensitive pedestrian bridge crossing a railway at Husum Station in the Copenhagen area.

Due to narrow access roads to the bridge, the project team proposed a very light prefabricated steel superstructure comprising three longitudinal steel beams and pre-installed glass fiber slabs as the bridge deck. The light superstructure and low construction height made the superstructure sensitive to pedestrian introduced vibrations. Dynamic analyses were conducted and the result was that tuned mass dampers (TMD) were required. However, measurements on site after erection of the bridge has shown that the dampers are not needed to fulfil the requirements. In the paper the reasons for the deviation between the analysis and the on-site measurements are analysed and discussed.