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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=709316
• 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.

由于环境因素等环境因素，桥梁桥梁的振动是缆线固定桥梁的长期问题。在过去的几十年中，这种类型的结构的增长导致了更长，更灵活的电缆。加上它们固有的阻尼，这使电缆振动成为近年来更严重的问题。尽管已经更好地理解了与不同类型的电缆振动相关的机制，并且已经在实际桥梁上提出和实施了各种控制方法，但在欣赏电缆行为的动态和空气动力学方面仍然需要有和不补充不同振动抑制对策的动态和空气动力学方面。 拟议的研究计划着重于推进电缆动力学和空气动力学的知识。短期目标是：a）研究各种实际元素对干燥倾斜电缆疾驰的机制的影响； b）评估长，灵活的电缆功能和桥梁甲板运动对长跨度有线桥梁性能的性能的影响； c）研究使用交叉和阻尼器组合混合系统对电缆振动控制的潜在应用并优化了相关的设计参数； d）在结构工程和风工程领域对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解决建立新颖，更有效的结构和空气动力学对策的基础，以抑制保持电缆的振动，为完善现有的桥梁停留电缆设计指南建立健全的基础，并为非损害性健康监测计划和桥梁结构和损坏方法的开发做出贡献。 提议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方面的知识，并更深入地了解与风诱导的电缆振动相关的机制。当评估长跨度有线桥梁上电缆振动控制解决方案的有效性时，现有电缆网络分析模型的完善尤其重要。对具有不同配置的混合系统动态响应的分析研究提供了一个合理的理论基础，以欣赏这种被动振动控制对策的机制，并允许识别指示其性能并因此设计的关键系统参数。通过旨在解决当今有线桥梁设计中一些最具挑战性的迫切问题，申请人非常有信心，这种领先的研究承诺的结果将对更可持续的民用基础设施的发展产生重大贡献。