Development of a Practical Model for Wind- and Rain-Wind-Induced Stay Cable Vibrations

本计画的目的是建立斜拉桥斜拉索在风雨作用下的振动模型。研究中的问题振动在三十年前首次被观察到，今天仍然无法完全理解。本研究计画将以圆柱体作为斜拉索的截面模型进行风洞试验。所得的数据会用作详细补充现有的实地观测数据，这些数据是透过长期的全尺寸测量所得的。实验结果将有助于识别引起振动的机制，并量化描述这种现象的核心参数，在此基础上将开发一个实用的振动模型。这项研究将有助于提高交通基础设施的安全性和性能，使工程师能够有效地设计出不易受振动问题影响的斜拉索以及为现有斜拉桥开发有效的缓解装置。该成果还将推进对流动流体与圆柱体之间相互作用的基本理解，从而影响使用此类圆柱体作为结构构件或组件的其他结构和系统。该项目还将通过研究生和本科生参与本研究的各个阶段，为他们提供高级教育培训。

The objective of this project is to develop a model for wind- and rain-wind-induced vibrations of stay cables on cable-stayed bridges. The problematic vibrations under study were first observed thirty years ago and today still elude full understanding. This research program will conduct wind-tunnel tests of circular cylinders as sectional models of stay cables. The data so-obtained will be used to carefully supplement existing field observations of stay cable vibrations obtained through long-term full-scale measurement. The experimental results will facilitate identification of the mechanisms that induce the vibrations and quantification of the core parameters that describe the phenomenon, on the basis of which a practical model for the vibration will be developed.When completed, this research will contribute to improving the safety and performance of transportation infrastructure by enabling engineers to efficiently design stay cables that are less susceptible to oscillatory problems as well as to develop effective mitigation devices for existing cable-stayed bridges. The outcome will also advance the fundamental understanding of interaction between a flowing fluid and circular cylinders and therefore impact other structures and systems that use such cylinders as structural members or components. The project will also provide advanced educational training to graduate and undergraduate students though their involvement at various stages of this research.