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Investigation and control of VIVs with multi-lock-in regions on wide flat box girders. (English) Zbl 1400.93239

Summary: On the preliminary designing of a wide flat box girder with the slenderness ratio 12, vertical and torsional Vortex-Induced Bibrations (VIV) are observed in wind tunnel tests. More than one lock-in region, which are defined as “multi-lock-in regions,” are recorded. Therefore, suspicions should be aroused regarding the viewpoint that wide box girders are aerodynamic friendly. As the three nascent vortexes originating at the pedestrian guardrails and inspection rails shed to near-wake through different pathways with different frequencies, the mechanisms of VIVs and multi-lock-in regions are analyzed to be determined by the inappropriate subsidiary structures. A hybrid method combining Large Eddy Simulation (LES) with experimental results is introduced to study the Flow-Structure Interactions (FSI) when undergoing VIVs; the vortex mode of torsional VIV on wide flat box girders is defined as “4/2S,” which is different from any other known ones. Based on the mechanism of VIV, a new approach by increasing ventilation rate of the pedestrian guardrails is proved to be effective in suppressing vertical and torsional VIVs, and it is more feasible than other control schemes. Then, the control mechanisms are deeper investigated by analyzing the evolution of vortex mode and FSI using a hybrid LES method.

MSC:

93C95 Application models in control theory
76G25 General aerodynamics and subsonic flows
74H45 Vibrations in dynamical problems in solid mechanics
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