Abstract Due to the blunt aerodynamic configuration, the edge-girder bridge deck may sustain severe vortex-induced vibrations (VIVs) that adversely affect bridge usability and security. In the present study, the VIV performance and the related aerodynamic mechanism of the two-box edge girder for a cable-stayed bridge are systematically investigated. Based on the flow pattern and vortex structure around the section simulated by computational fluid dynamics, it is inferred that the aerodynamic interactions of the large-scale vortices under the deck and the shedding vortices in the wake zone periodically change the fluctuating pressures on the section and induce the vibrations of the deck. Moreover, several aerodynamic mitigation countermeasures are designed. Their effects on the vertical VIV are experimentally investigated in detail. It is found that the vertical VIVs are considerably suppressed at different attack angles (−3°, 0°, and +3°) by installing the mini-triangular wind fairings, which can satisfy the bridge wind-resistant design requirements. Further numerical simulations show that after the installation of the effective countermeasures, vortex shedding in the wake zone is mitigated, and the strengths and distortions of large-scale vortices around the upper and lower surfaces of the section also decrease, thereby the vertical VIV is suppressed effectively.

中文翻译：

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斜拉桥双箱边梁涡激振动试验与数值研究

摘要 由于钝的空气动力学配置，边梁桥面板可能承受严重的涡激振动（VIVs），对桥梁的可用性和安全性产生不利影响。在目前的研究中，系统地研究了斜拉桥双箱边梁的 VIV 性能和相关的空气动力学机制。根据计算流体动力学模拟的截面周围流型和涡结构，推断甲板下大尺度涡与尾流区脱落涡的气动相互作用周期性地改变截面上的脉动压力和引起甲板的振动。此外，还设计了几种空气动力学缓解对策。通过实验详细研究了它们对垂直 VIV 的影响。结果表明，通过安装小三角风整流罩，在不同攻角（-3°、0°和+3°）下垂直VIV得到了显着抑制，满足桥梁抗风设计要求。进一步的数值模拟表明，安装有效对抗措施后，尾流区的涡流脱落得到缓解，截面上下表面周围大尺度涡的强度和畸变也减小，从而抑制了垂直VIV有效。