Herøysund bridge is a post-tensioned bridge located in Nordland Fylkeskommune. Recent inspections have identified corrosion in the tendons of the post-tension system. The bridge was recently strengthened to extend the service life of the structure. A replacement of the bridge has been planned and the old bridge will be demolished. This case constitutes an excellent case study to try to improve current engineering practice in structural assessment of existing structures, by applying the latest scientific developments. Nordland Fylkeskommune together with Statens Vegvesen consider that the in-depth evaluation of this bridge can bring additional knowledge and better understanding of a structure’s state, deterioration mechanism and structural safety. This will contribute towards the refined and improved structural assessment procedures.

The project goals are:

• Gather as much information as possible about the current state of the bridge.
• Perform structural health monitoring of the bridge using the existing sensor installation together with a new extended sensor installation.
• Perform inspections on the post-tensioned system of the bridge, understand the corrosion mechanism and review best practices for reparation.
• Structural assessment and evaluation of different damage scenarios.
• Take advantage of probabilistic methods to evaluate the reliability of the results.

The Research and Development (R&D) activities planned for this case study have been grouped into 4 different topics, that have been organized in corresponding Work Packages (WP):

• WP1: Structural health monitoring
• WP2: Corrosion inspection, assessment, and repair
• WP3: Structural assessment with damaged post-tension
• WP4: Reliability and uncertainty quantification

Project funded by: Norland Fylkeskommune (NFK) and Statens Vegvesen (SVV)

Project partners involved in th activities in this project:

• NTNU
• SINTEF
• The Artic University of Norway (UIT)
• Norland Fylkeskommune (NFK)
• Statens Vegvesen (SVV)