Inverse identification

In the design of long span bridges, the dynamic response is traditionally analyzed by combining a numerical model of the structure together with load states from design codes. Inverse identification treats the system dynamics differently; here, the inputs on the structure is assumed unknown. Using the measured dynamic response (primarily accelerations), novel techniques for handling inverse problems in structural dynamics can identify the ambient forces the structure is exposed to. Another application for the inverse techniques is full-field response estimation, meaning the methodology can be incorporated as an element in systems for structural monitoring.

This research field is relatively young and use of the inverse techniques on long span bridges has not been attempted before. A long term objective of the research is to reduce uncertainties of the wave and wind load models. Both the Hardanger Bridge and the Bergsøysund Bridge are used as case studies for the application of techniques in inverse identification.