Upgrading, assessment and maintenance of our ageing infrastructure like bridges, dams and buildings has grown in importance. Recently the Swedish and Norwegian Railway Association decided to upgrade the Iron Ore railway transport system going from Lulea to Narvik from 25 to 30 ton of axle load to increase the iron ore transport capacity. This paper describes the upgrade procedure for two concrete bridges. In the first case, the Kallkaellan Bridge, the moment capacity in the bridge cross direction was to low and it was decided to strengthen the bridge with a new method Since the repair method never been used on bridges in Sweden before it was decided to launch a comprehensive testing program to monitor the performance of the strengthening method. In the second case, the Loussajokki Bridge, the calculation showed that the increased axle loads would exceed the yield limit in the reinforcement. However, since strain measurement indicated much lower levels than expected, refined calculations using First Order of Reliability Method, FORM were conducted. Based on the experience from the two cases a bridge management system is suggested where live data from health monitoring can be used with probabilistic methods to evaluate the current state in form of a safety index.
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