Abstract
This paper presents a full-scale analysis of wind and traffic-induced vibrations of a long-span suspension bridge in complex terrain. Several wind and acceleration sensors have been installed along the main span on Lysefjord Bridge in Norway. In the present study, three days of continuous records are analysed. Traffic-induced vibrations are dominant at low and moderated wind speed, with non-negligible effects on the overall bridge response for heavy vehicles only. Traffic and wind-induced vibrations are compared in terms of root mean square of the acceleration response, and three simples approaches are proposed to isolate records dominated by wind-induced vibration. The first one relies on the separation of nocturnal and diurnal samples. The second one is based on the evaluation of the time-varying root mean square of the acceleration response. The last one evaluates the relative importance of the high frequency domain of the acceleration bridge response. It appears that traffic-induced vibrations may have to be taken into account for the buffeting analysis of long- span bridge under moderated wind.
Highlights
The Lysefjord Bridge crosses the narrow inlet of a fjord in the South-West of Norway, at an altitude of 55 m
The corresponding wind records shows that the bridge response is not always correlated with the mean wind speed
On 02/10/2014, the wind speed was lower than 3 m/s, but the peak response still increases during the day
Summary
The Lysefjord Bridge (figure 1) crosses the narrow inlet of a fjord in the South-West of Norway, at an altitude of 55 m. At the beginning of October 2014, seven sonic anemometers and four couples of tri-axial accelerometers were operational along the bridge deck (figure 2). The accelerometers are installed near Hangers 09, 18, 24 and 30 on both side of the deck so that lateral, vertical and torsional accelerations can be recorded. The anemometers located on hangers 10, 16, 18, 20, 24 and 30 are placed about 6 m above the West side of the deck. Two additional anemometers are installed on hanger 08. They are noted H-08b and H-08t and are located 6 and 10 m above the bridge deck respectively. Acceleration and wind data are synchronized using GPS timing and down-sampled to 20 Hz
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