Numerical study on the effectiveness of two dampers on high-order vortex-induced vibration and low-order rain-wind-induced vibration of stay cables

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2024-08-06 DOI:10.1016/j.jweia.2024.105849

Yuanyuan Wang, Shouying Li, Kai Qie, Zhengqing Chen

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Abstract

In recent years, high-order vortex-induced vibrations (VIVs) of ultra-long stay cables have been frequently observed on real bridges. However, additional dampers or aerodynamic measures were often designed to suppress wind-rain induced vibrations (RWIVs) of stay cables, which is mainly for the vibrations of low-order modes. This brings new challenges to the vibration reduction of stay cables. In this study, the theoretical models are used to investigate VIV and RWIV characteristics of ultra-long stay cables and verify the validity of installing two viscous dampers at the lower end of stay cables to suppress low-order RWIV and high-order VIV simultaneously. First, an empirical model, the wake oscillator model, is introduced to study VIV characteristics of stay cables subjected to different wind profiles, damping ratio and wind velocity, and the linear wake-structure coupling resonance is also introduced to investigate VIV mechanism of the stay cable. Second, the characteristics of RWIV of ultra-long stay cables based on the existing RWIV model is investigated. Finally, the optimizing parameters of the cable-dampers system is conducted for simultaneous control of RWIV and VIV, and the multimode damping is investigated. Finally, the study compares and analyzes the control effect of the multimode vibration with different measures.

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关于两个阻尼器对高阶涡流诱导振动和低阶雨风诱导振动的效果的数值研究

近年来，在实际桥梁上经常观察到超长留置索的高阶涡诱导振动（VIVs）。然而，人们通常设计额外的阻尼器或空气动力措施来抑制留置索的风雨诱导振动（RWIVs），这主要是针对低阶模态的振动。这给留索减振带来了新的挑战。本研究利用理论模型研究了超长留置电缆的 VIV 和 RWIV 特性，并验证了在留置电缆下端安装两个粘性阻尼器以同时抑制低阶 RWIV 和高阶 VIV 的有效性。首先，引入经验模型--尾流振荡器模型，研究了不同风廓线、阻尼比和风速下的留索VIV特性，并引入线性尾流-结构耦合共振，研究了留索的VIV机理。其次，基于现有的 RWIV 模型，研究了超长留置索的 RWIV 特性。最后，对同时控制 RWIV 和 VIV 的缆索-阻尼器系统参数进行了优化，并对多模阻尼进行了研究。最后，研究对比分析了不同措施对多模振动的控制效果。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.