Wind-induced Cable Vibrations: Advancing in Comprehension of Excitation Mechanisms and Development of Countermeasures

风致电缆振动：加深对激励机制的理解并制定对策

• 批准号: RGPIN-2016-04446
• 负责人: Cheng, Shaohong
• 金额: $ 2.26万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=615067
• 关键词: Wind; induced; Cable; Vibrations; Advancing

Vibrations of bridge stay cables due to environmental factors like wind is a long-standing issue in cable-stayed bridges. In the past few decades, the growing span length of this type of structure led to longer and more flexible cables. This, combined with their low inherent damping, renders cable vibrations a more serious problem in recent years. Though mechanisms associated with different types of cable vibrations have been understood better, and various controlling methods have been proposed and implemented on real bridges, much is still needed in appreciating the dynamic and aerodynamic aspects of cable behaviour with and without the supplementation of different vibration suppression countermeasures. The proposed research program focuses on advancing knowledge in cable dynamics and aerodynamics. The short-term objectives are: a) to study the effects of various practical elements on the mechanisms of dry inclined cable galloping; b) to evaluate the impact of long, flexible cable feature and bridge deck motion on the performance of cable networks on long-span cable-stayed bridges; c) to investigate the potential application of using cross-tie and damper combined hybrid system to cable vibration control and optimize the associated design parameters; and d) to achieve proper training of HQP in the areas of structural engineering and wind engineering. As a long-term goal, the proposed research program aims at settling the base for developing novel and more effective structural and aerodynamic countermeasures to suppress stay cable vibrations, building a sound foundation for refining the existing bridge stay cable design guidelines, and contributing to the development of non-destructive health monitoring program and damage detection methods of bridge structures and stay cables. The aerodynamic part of the proposed work will further comprehend our knowledge in fluid-structure interaction, and lead to a deeper insight of mechanisms associated with wind-induced cable vibrations. The refinement of existing cable network analytical model is particularly important when assessing the effectiveness of cable vibration control solutions on long-span cable-stayed bridges. The analytical study on the dynamic response of hybrid system with different configurations offers a sound theoretical base to appreciate the mechanics of this passive vibration control countermeasure and allows identifying key system parameters dictating its performance and thus design. By aiming at resolving some of the most challenging yet pressing issues in the design of cable-stayed bridges today, the applicant is very confident that the outcomes from such a leading-edge research commitment will contribute significantly to the development of more sustainable civil infrastructures.

桥梁斜拉索由于风等环境因素引起的振动是斜拉桥中一个长期存在的问题。在过去的几十年里，这种结构的跨度不断增长，导致拉索变得更长、更灵活。这一点，再加上其固有的低阻尼，使得近年来电缆振动成为一个更加严重的问题。尽管与不同类型的拉索振动有关的机理已经有了更好的了解，各种控制方法也已经被提出并在实际桥梁上实施，但在有或没有补充不同的减振对策的情况下，仍然需要更多地评价拉索行为的动力学和空气动力学方面。 拟议的研究计划侧重于提高缆索动力学和空气动力学方面的知识。短期目标是：(A)研究各种实际因素对干斜拉索舞动机理的影响；(B)评估长而灵活的拉索特征和桥面运动对大跨度斜拉桥索网性能的影响；(C)研究使用交叉系杆和阻尼器组合系统控制拉索振动的潜在应用，并优化相关的设计参数；以及(D)在结构工程和风工程领域实现HQP的适当培训。作为一个长期目标，该研究计划旨在为开发新颖、更有效的结构和空气动力对策以抑制斜拉索的振动奠定基础，为完善现有的桥梁斜拉索设计指南奠定坚实的基础，并为桥梁结构和斜拉索的无损健康监测和损伤检测方法的发展做出贡献。 拟议工作的空气动力学部分将进一步理解我们在流体-结构相互作用方面的知识，并导致对与风致拉索振动相关的机制的更深层次的了解。在评估大跨度斜拉桥拉索振动控制方案的有效性时，对现有索网分析模型的改进尤为重要。对不同构型混杂系统动态响应的分析研究，为理解这种被动振动控制对策的机理提供了良好的理论基础，并可以识别决定其性能和设计的关键系统参数。通过致力于解决当今斜拉桥设计中一些最具挑战性但最紧迫的问题，申请人非常有信心，这种前沿研究承诺的结果将对更可持续的民用基础设施的发展做出重大贡献。