Towards Enhancing Structural Sustainability of Bridge Stay cables

提高桥梁斜拉索的结构可持续性

• 批准号: RGPIN-2022-02973
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749032
• 关键词: Towards; Enhancing; Structural; Sustainability; Bridge

Frequent and large amplitude vibrations of stay cables due to various environmental factors like wind is a long-standing issue in cable-stayed bridges. In the past few decades, the growing bridge span length 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 vibration have been understood better, and various controlling methods have been proposed and implemented on site, much is still needed in appreciating the dynamic and aerodynamic aspects of cable behavior with and without the supplementation of different vibration suppression measures. The proposed research program focuses on advancing knowledge in cable dynamics and aerodynamics. The short-term objectives are: a) to study effects of various practical elements on the excitation mechanisms of dry inclined cable galloping; b) to implement AI technology and an adaptive control algorithm in the semi-active control for cable vibrations; c) to investigate the potential application of smart material as cable cross-ties and evaluate its impact on the cable network dynamic response; and d) to achieve proper training of HQP in the areas of structural engineering and wind engineering. The long-term goal aims to: a) settle the base for developing novel and effective structural and aerodynamic measures to suppress cable vibrations; b) build a sound foundation for refining the existing stay cable design guidelines; and c) contribute to the development of non-destructive health monitoring programs and damage detection methods of bridge structures and stay cables. The aerodynamic part of the proposed work will further enhance our knowledge in fluid-structure interaction, and lead to a deeper insight of mechanisms associated with wind-induced cable vibrations and shed light on developing novel aerodynamic countermeasures. The implementation of AI technology and adaptive control algorithms to semi-active control using magnetorheological (MR) dampers will allow to develop a cost-effective real time cable vibration control scheme independent of structural characteristics and efficiently identify damper parameters for deriving an accurate inverse model. The application of super-elastic shape memory alloy (SMA) as novel cross-tie material can address the limitations of the current steel cross-tie and is expected to greatly enhance damping and durability of the resulting cable networks. The proposed research will encompass the development of and contribute to the knowledge of structural health monitoring, assessment and management of bridges, which is a vitally important area. The civil engineering HQP trained with these skills will be in high demand upon graduation. The applicant is very confident that the efforts of the proposed research will have a significant impact on the development of more sustainable and safer civil infrastructures.

由于风等各种环境因素导致的斜拉索频繁、大幅度振动是斜拉桥长期存在的问题。在过去的几十年里，桥梁跨度的不断增长导致电缆更长、更灵活。这与它们的低固有阻尼相结合，使得电缆振动近年来成为一个更加严重的问题。尽管人们已经更好地理解了与不同类型的缆索振动相关的机制，并且已经提出并现场实施了各种控制方法，但在有或没有补充不同振动抑制措施的情况下，仍需要了解缆索行为的动态和空气动力学方面。 。拟议的研究计划侧重于推进电缆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缆舞动激励机制的影响； b) 在索振动半主动控制中实施人工智能技术和自适应控制算法； c) 研究智能材料作为电缆桥接件的潜在应用，并评估其对电缆网络动态响应的影响； d) 在结构工程和风工程领域对总部人员进行适当的培训。长期目标旨在： a) 为开发新颖有效的结构和空气动力措施以抑制缆索振动奠定基础； b) 为完善现有斜拉索设计指南奠定坚实的基础； c) 促进桥梁结构和斜拉索无损健康监测计划和损伤检测方法的开发。拟议工作的空气动力学部分将进一步增强我们在流体-结构相互作用方面的知识，并深入了解与风引起的电缆振动相关的机制，并为开发新型空气动力学对策提供线索。使用磁流变（MR）阻尼器将人工智能技术和自适应控制算法应用于半主动控制，将能够开发出一种经济有效的实时缆索振动控制方案，与结构特性无关，并有效地识别阻尼器参数以导出精确的逆模型。超弹性形状记忆合金（SMA）作为新型拉杆材料的应用可以解决当前钢拉杆的局限性，并有望大大提高所得电缆网络的阻尼和耐用性。拟议的研究将包括桥梁结​​构健康监测、评估和管理知识的发展和贡献，这是一个至关重要的领域。受过这些技能培训的土木工程 HQP 毕业后将非常受欢迎。申请人非常有信心，拟议的研究工作将对开发更可持续、更安全的民用基础设施产生重大影响。