Älvsborgsbron is a suspension bridge from 1966 that crosses Göta Älv in Gothenburg, Sweden. It carries a six-lane highway, pedestrian and bicycle tracks. The main span is 417,6 meters and the bridge, including approach bridges, is approximately 900 meters. The Pylons are approximately 100 m tall.
Ramboll has carried out the structural assessment in order to increase the weight limits on the vehicles crossing the bridge. A 3D non-linear FE-model was used for the analysis. The model was calibrated to the actual behavior of the bridge including cable and hanger forces and displacements.
Forces in hangers were determined by measuring accelerations. Main cable forces were determined by measuring the cable geometry and measuring accelerations of the back stays.Movements at expansion joints and relative displacements between main cables and bridge girder at mid span were used to verify the behavior of the FE-model. Further the movements were used for estimating vehicle loading for assessing fatigue damage.