Mechanisms and mitigation of bridge stay cable vibrations

桥梁斜拉索振动的机理及缓解

基本信息

批准号：
314869-2011
负责人：
Cheng, Shaohong
金额：
$ 1.38万
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：
2015
资助国家：
加拿大
起止时间：
2015-01-01 至 2016-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=571818
关键词：
Mechanisms mitigation bridge stay cable

项目摘要

Vibrations of bridge stay cables due to environmental factors like wind is a contemporary 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 aims at resolving some of the most urgent and critical issues in the cable-stayed bridge design today. The objectives are: a) to develop a probability-based model for predicting dynamic response and assessing safety level of an externally damped bridge stay cable; b) to study the impact of cable-deck interaction on the efficacy of external dampers in suppressing cable vibrations; c) to investigate the fluid-structure interaction between an oscillating cable and its surrounding flow field for further clarification of wind-induced cable vibration mechanisms; and d) to achieve proper training of HQP in the areas of structural engineering and wind engineering.

由于环境因素等环境因素，桥梁桥梁的振动是缆线停机桥梁中的当代问题。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。拟议的研究计划旨在解决当今有线桥设计中一些最紧迫，最关键的问题。目的是：a）开发一个基于概率的模型，以预测动态响应并评估外部阻尼的桥梁停留电缆的安全水平； b）研究有线甲板相互作用对抑制电缆振动的功效的影响； c）研究振荡电缆及其周围流场之间的流体结构相互作用，以进一步阐明风引起的电缆振动机制； d）在结构工程和风工程领域对HQP进行适当的培训。