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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=647461
• 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.***

风等环境因素引起的斜拉索振动是斜拉桥长期存在的问题。在过去的几十年里，这种类型的结构的跨度长度的增长导致更长和更灵活的电缆。这一点，加上其固有阻尼低，使电缆振动近年来成为一个更严重的问题。尽管人们已经更好地理解了与不同类型的拉索振动相关的机制，并且已经提出了各种控制方法并在真实的桥梁上实施，但在了解拉索行为的动力学和空气动力学方面，无论是否补充了不同的振动抑制对策，都仍然需要做很多工作。*拟议的研究计划侧重于推进电缆动力学和空气动力学的知识。短期目标是：研究了大跨度斜拉桥斜拉索驰振的机理，分析了拉索的长柔特性和桥面运动对大跨度斜拉桥索网性能的影响，探讨了采用系杆和阻尼器组合的混合系统进行拉索振动控制的可能性，并优化了相关的设计参数;以及d）在结构工程和风力工程领域对HQP进行适当的培训。作为一个长期目标，拟议的研究计划旨在为开发新的和更有效的结构和空气动力学对策奠定基础，以抑制斜拉索振动，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计划和损伤检测方法的发展做出贡献。所提出的工作的空气动力学部分将进一步理解我们在流体-结构相互作用的知识，并导致与风致拉索振动的机制有更深的了解。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精化尤为重要。不同配置的混合动力系统的动态响应的分析研究提供了一个良好的理论基础，以欣赏这种被动振动控制对策的力学，并允许识别关键系统参数决定其性能，从而设计。通过旨在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成果将大大有助于发展更可持续的民用基础设施。