Topographic effects on the aerodynamic design
of the Julsundet Bridge
Giulia Pomaranzi,Filippo Calamelli,Tommaso Argentini,Alberto Zasso,Jungao Wang
Abstract
The design of long-span bridges in complex terrains poses significant challenges, particularly in regions
with pronounced topographic variations. This study examines the influence of topography on the wind characteristics
and its implications for the aerodynamic design of the Julsundet Bridge, a planned long-span structure in Norway.
Experimental data from terrain model wind tunnel tests are analyzed to assess how local topography affects wind
speed, turbulence intensity, and directional changes along the bridge axis. Special focus is placed on the variations in
angle of attack and velocity distribution induced by the surrounding fjords. Results showing terrain-induced effects
on the wind directions, turbulence intensities and mean wind velocities are presented. The results highlight substantial
spatial heterogeneity in wind characteristics, which must be considered in the prediction of the buffeting response of
the bridge. These findings emphasize the importance of incorporating site-specific topographic effects in the design
process to ensure optimal performance and safety of the bridge built in complex terrain.
