Study on the Vortex‐Induced Vibration Performance of the LSOB Girder of a Valley‐Crossing Suspensions Bridge

• DOI: 10.1155/vib/5589608
• Publication Date: 2024-12-30T10:36:02Z
• Authors: Weihong Ji; Yu Lin; Shaopeng Yang; Lin Huang
• Keywords: Bridge (graph theory); Vortex-induced vibration

The lower semi‐open box (LSOB) girder is widely used in large‐span bridges due to its favorable stress performance and cost‐effectiveness. vortex‐induced vibration (VIV) of the LSOB was studied by using a 1:55 section model wind tunnel test. test results show that there are obvious vertical torsional VIV intervals with significant amplitudes at each angle attack damping ratios about 0.35%. CFD numerical simulations indicate VIVs girders mainly induced two types vortices: one inclined webs leeward nozzles another upstream upper surfaces deck. Conventional aerodynamic suppression measures, such as central stabilizing plate guide vane gantry rail, demonstrate can reduce response all angles attack, decreasing amplitude 40%–50% 10%–25%. Although adding further optimizes performance, effect limited. Installing helps redistribute vortices below girder, transforming large into smaller ones, most which do not detach, thereby reducing vortex shedding intensity wake area. bilateral vanes maintenance car track weaken diagonal on side.