Recent developments in the research project ZfPStatik for a guideline on inspection-supported reliability assessment of existing bridges in Germany

Bridges demand detailed analysis and adherence to evolving engineering standards. Many existing bridges are experiencing challenges such as aging-related deterioration, increased traffic loads, and discrepancies with updated technical requirements. This paper aims to present the key elements of a newly developed recommendation for action about inspection-based reliability analysis of existing bridges in Germany.

The project seeks to integrate the benefits of semi-probabilistic and probabilistic assessment concepts, enabling the incorporation of measured data into the reliability analysis of existing structures through partial factor modification. The primary focus is on broader use of non-destructive testing methods for verifications in both the ultimate limit state and the serviceability limit state. The project, which started in 2022, is carried out by several research institutes and engineering companies. The project and the developed recommendation are outlined, covering the process from defining targeted inspection strategies to assessing the quality of measured data and performing structural, partial factor-based evaluations utilizing the quality-assessed on-site inspection results. The application is demonstrated through a case study involving an existing concrete frame bridge, temperature monitoring and inspection of the reinforcement.