The Haparanda Railway Bridge was upgraded for a higher load resistance in the summer of 2012. The slab of the 50 year old bridge was subjected to horizontal posttensioning and the railway administrators could thereby permit higher axle loads, 300 kN instead of the original 250 kN. The strengthening procedure was first examined in a laboratory pilot study and since the results were good, the method was applied on a real bridge. The posttensioning of the Haparanda Bridge reduced the strain in the tensile reinforcement substantially; all strains from a 215 kN/axle train were in fact counteracted.
Godkänd; 2014; 20140820 (jonnil); Konferensartikel i tidskrift