Wind and Vibration Measurements on the Lysefjord Bridge
Master thesis
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https://hdl.handle.net/11250/3027653Utgivelsesdato
2022Metadata
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Sammendrag
The Lysefjord Bridge is a suspension bridge located in the western part of Norway. Since 2013 it has been used as a full-scale wind engineering laboratory and is fitted with sonic anemometers, tri-axial accelerometers, pressure probes and a GNSS based displacement sensor. The objective of this thesis is to gain knowledge about the wind effects a suspension bridge is exposed to, and try to link some of these wind effects to the vertical accelerations of the bridge deck.Large quantities of wind data is aquired from four different time-series originating during the fall of 2021. These data was processed, analysed and visualised mainly by the use of MATLAB, and compared to results of previous research on the bridge. The results showed that the horizontal wind velocity and the vertical wind velocity from the four different time-series had little impact regarding the vertical accelerations of the bridge deck. The wind direction seemed to have a miniscule impact on the horizontal velocity, but looked to have a larger impact on both the vertical wind velocity and the vertical angle-of attack. The general conclusion was that for lower wind velocities, traffic had larger impact on the vertical accelerations. The noticeable accelerations registered by the accelerometers was seen regardless of measured wind velocity from the surrounding anemometers at the same timestamps.