Abstract
The proposed bridge over the Stretto di Messina has domensions out of proportion with any other civil engineering structure. The 3300 m span will be supported by 376 m high towers. The H-shape steel towers (64 m taller than the Eiffel Tower) have been the object of wind tunnel investigations to determine their aerodynamic behaviour. Vortex-shedding induced oscillations, aerodynamic stability limits and buffeting response to simulated atmospheric boundary layer wind were investigated using various section models at a geometric scale of 1:140 and a full aeroelastic model of the free standing tower at a scale of 1:250. This paper presents the main findings of these studies conducted at two separate laboratories and compares the section model test to the full model tests. Three-dimensional effects are discussed as well as the mitigation of vortex shedding induced oscillations using screens attached to the round edges of the tower cross-section.
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