PhD-project in modelling and control of wind-induced vibration of suspension bridge hangers
The design and construction of long-span suspension and cable-supported bridges are significantly increased in recent years. With the span length continuously increasing, vibrations induced by wind action are a central concern during the design process.
Among the structural elements that can be easily forced by the action of the wind, there are the hangers of suspension bridges. Significant hanger vibration has often been observed but never considered dangerous. However, in the case of the Hålogaland bridge in Narvik, violent vibration has been observed. To mitigate this phenomenon particular dampers have been installed, that however broke during a storm a short time after installation.
The aim of this PhD project is to analyze the phenomenon of wind-induced vibration on bridge hangers using in-field data from the Hålogaland bridge. Furthermore, the recorded data will be used to better understand the behaviour of the Stockbridge dampers and develop a methodology to optimize their placement. Finally, design recommendations will be given to avoid similar issues in future projects.
The monitoring of the bridge hangers and this project are carried out thanks to the collaboration between the Structural Engineering Department and the Norwegian Public Roads Administration.