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

本项目旨在建立斜拉桥上斜拉索在风、雨、风作用下的振动模型。所研究的有问题的振动是在30年前首次观察到的，今天仍然无法完全理解。本研究项目将对圆柱体作为斜拉索截面模型进行风洞试验。获得的数据将用于仔细补充通过长期全面测量获得的斜拉索振动的现有现场观测。实验结果将有助于识别引起振动的机制和描述该现象的核心参数的量化，在此基础上将开发出实用的振动模型。一旦完成，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不易受振荡问题影响的斜拉索，并为现有斜拉桥开发有效的减缓装置。这一结果也将促进对流动流体和圆柱之间相互作用的基本理解，从而影响使用此类圆柱作为结构构件或组件的其他结构和系统。该项目还将为研究生和本科生提供先进的教育培训，通过他们参与研究的各个阶段。

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.