超大跨度悬索桥涡激振动响应与振动控制
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U448.25 U447

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河北省自然科学(E2019203413);河北省教育厅项目(ZD2019096)


Research on Vortex-Induced Vibration Response and Vibration Control of Super-Long-Span Suspension Bridge
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    摘要:

    超大跨度钢箱梁悬索桥的结构阻尼和刚度较小,其竖向模态频率低且密集,随风速变化加劲梁可能先后发生多次涡激振动。首先针对某超大跨度悬索桥,进行有限元建模和动力分析。为研究悬索桥多模态涡激振动响应机理和有效抑振措施,在忽略气动刚度和气动阻尼影响时,通过简化Scanlan经验非线性涡激力数学模型得到谐涡力数学模型。然后以各竖向模态涡振最大位移响应为优化目标,基于液体黏滞阻尼器参数敏感性分析和TMD参数优化设计方法,分别确定阻尼器参数和TMD参数。最后探讨了黏滞阻尼器耗能系统控制悬索桥多阶竖向模态涡振的可行性,详细分析了TMD系统控制涡激振动的效果。结果表明:在塔梁间设置黏滞阻尼器对各竖向模态主要起振区域的涡振位移控制效果不理想;TMD系统能有效抑制常遇风速范围内加劲梁的多阶竖向模态涡振响应,将最大振幅严格控制在容许值以内,提高了加劲梁抵抗涡振变形的能力。

    Abstract:

    The structural damping and stiffness of the super-long-span steel box girder suspension bridge are small, and its vertical modal frequency is low and dense. With the change of wind speed, the stiffening girder may occur many times of vortex-induced vibration. Firstly, finite element modeling and dynamic analysis were carried out for a super-long-span suspension bridge. In order to study the multi-modal vortex-induced vibration response mechanism and effective vibration suppression measures of suspension bridge, while neglecting the effects of aerodynamic stiffness and aerodynamic damping, the simple harmonic vortex excitation mathematical model was obtained by simplifying the Scanlan empirical nonlinear vortex excitation mathematical model. Then, with the maximum displacement response of each vertical mode as the optimization objective, based on the parameter sensitivity analysis of the liquid viscous damper and the TMD parameter optimization design method, the damper parameters and TMD parameters were determined respectively. Finally, the feasibility of viscous damper energy dissipation system to control multi-order vertical modal vortex vibration of suspension bridge was discussed, and the effect of TMD system to control vortex-induced vibration was analyzed in detail. The results show that, Setting up viscous dampers between the towers and girders has an unsatisfactory effect on the vortex displacement control of the main vibration region of each vertical mode. The TMD system can effectively restrain the multi-order vertical modal vortex vibration response of the stiffening girder in the range of frequently encountered wind speed , strictly control the maximum amplitude within the allowable value, and improve the ability of the stiffening girder to resist vortex vibration deformation.

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郑成成,向泓舟,陈永祁,等. 超大跨度悬索桥涡激振动响应与振动控制[J]. 科学技术与工程, 2022, 22(18): 8103-8109.
Zheng Chengcheng, Xiang Hongzhou, Chen Yongqi, et al. Research on Vortex-Induced Vibration Response and Vibration Control of Super-Long-Span Suspension Bridge[J]. Science Technology and Engineering,2022,22(18):8103-8109.

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  • 收稿日期:2021-11-28
  • 最后修改日期:2022-06-08
  • 录用日期:2022-01-22
  • 在线发布日期: 2022-07-14
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