Vortex-induced vibration (VIV) of long-span double-deck steel truss bridges is complicated by the permeable truss region, which introduces multi-path flow interactions and makes aerodynamic control strongly placement-dependent. Taking the Huangjuetuo Yangtze River Bridge as a case study, sectional-model wind tunnel tests were conducted to investigate the VIV behavior of the main girder in both construction- and completed-stage configurations. Two passive aerodynamic appendages, namely 60° triangular wind nozzles and guide vanes with a 2:1 aspect ratio, were arranged on different member groups to evaluate mitigation effectiveness. Results show that the completed-stage girder exhibits pronounced vertical VIV at +3° and +5° angles of attack, with a maximum reduced amplitude of 0.343. Among the tested configurations, the combined placement of wind nozzles on the upper chords and diagonal members provides the best suppression performance, achieving reduction rates of 71.6% and 70.0% at +3° and +5°, respectively. To clarify the underlying mechanism, two-dimensional fluid–structure interaction, three-dimensional rigid-section large-eddy simulation, and dynamic mode decomposition were employed. Results indicate that this arrangement weakens the roll-up of the upper-surface separated shear layer and the vortex interaction within the truss region, thereby reducing wake organization and the associated periodic aerodynamic forcing. The controlled wake also becomes less dominated by a coherent antisymmetric mode and exhibits more fragmented and less temporally organized modal structures.
Li et al. (Mon,) studied this question.
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