Modeling and Mitigation of Stay Cable Vibration

斜拉索振动的建模和缓解

• 批准号: 0201349
• 负责人: Nicholas Jones
• 金额: $ 18.6万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0201349&HistoricalAwards=false
• 关键词: Modeling; Mitigation; Stay; Cable; Vibration

Cable-Stayed bridges are commonly exhibiting large-amplitude vibrations of the main stays, frequently associated with the simultaneous occurrence of wind and rain. These vibrations are of concerns because they potentially induce fatigue in the cables and cable anchorages. Past research on excitation mechanisms has generally been conducted using wind tunnels, and several distinct aerodynamic mechanisms have been proposed. While considerable progress has been made in understanding and mitigating these vibrations, the state of the art has still not enabled the prediction of field behavior based on a set of supplied parameters, nor does a plausible, accepted model exist for the phenomenon. This research effort is building upon previous findings and the wealth of full-scale data collected in past projects in order to develop an understanding of the mechanics of stay-cable vibration at a more fundamental level and to enable the recommendation of more effective and economical mitigation strategies.

斜拉桥通常表现出主斜拉索的大振幅振动，经常与同时发生的风和雨有关。这些振动令人担忧，因为它们可能会引起电缆和电缆锚固的疲劳。过去对激励机制的研究一般是利用风洞进行的，并提出了几种不同的气动机制。虽然在理解和减轻这些振动方面已经取得了相当大的进展，但目前的技术水平仍然无法基于一组提供的参数来预测现场行为，也没有一个合理的、可接受的模型来解释这种现象。这项研究工作是建立在以前的研究结果和在过去的项目中收集的大量全面数据的基础上，以便在更基本的层面上了解斜拉索振动的机制，并能够提出更有效和更经济的缓解战略建议。