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

本项目的目的是建立斜拉桥斜拉索的风雨风振模型。正在研究中的有问题的振动最早是在30年前观察到的，今天仍然无法完全理解。本研究项目将进行圆柱体作为斜拉索节段模型的风洞试验。这样获得的数据将被用来仔细补充通过长期全尺寸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理和量化描述这种现象的核心参数，并在此基础上开发出实用的振动模型。完成后，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容易受到振动问题影响的斜拉索，并为现有斜拉桥开发有效的缓解装置。这一成果还将促进对流动的流体和圆柱体之间相互作用的基本理解，从而影响使用这种圆柱体作为结构构件或部件的其他结构和系统。该项目还将通过参与这项研究的不同阶段，为研究生和本科生提供高级教育培训。

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.