Multi-box girder deck section (typically a twin-box) is considered an effective solution to increase the aeroelastic stability threshold. However, besides this positive feature, twin-box sections may have some aerodynamic problems that should be accurately addressed during the tailoring of the section: dependence of unsteady force coefficients of the mean angle of attack, amplitude of motion, Reynolds number; complex vortex shedding phenomenon and related vortex-induced vibrations. It is shown that small geometrical details can influence significantly the overall performance of the twin-box section, calling for further research studies on this topic.
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