纵向肋条对斜拉索减振特性的影响研究

doi:10.16265/j.cnki.issn1003-3033.2019.06.022

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (6): 134-139.doi: 10.16265/j.cnki.issn1003-3033.2019.06.022

纵向肋条对斜拉索减振特性的影响研究

毕继红^1,2 教授, 乔浩玥¹, 关健¹, 王剑^3,4

1 天津大学建筑工程学院,天津 300350;
2 滨海土木工程结构与安全教育部重点实验室,天津 300072;
3 天津城建大学土木工程学院,天津 300384;
4 天津软土特性与工程环境重点实验室,天津 300384

收稿日期:2018-02-20 修回日期:2019-04-26 发布日期:2020-11-02
作者简介:毕继红(1965—),女,江苏宜兴人,博士,教授,主要从事大跨桥梁及柔性结构的动力响应分析方面的研究。E-mail:jihongbi@163.com。
基金资助:
天津市自然科学基金资助(18JCYBJC90800)

Analysis of mitigation effect of longitudinal ribs on stay cable

BI Jihong^1,2, QIAO Haoyue¹, GUAN Jian¹, WANG Jian^3,4

1 School of Civil Engineering, Tianjin University, Tianjin 300350, China;
2 Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin 300072, China;
3 School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;
4 Key Laboratory of Soft Soil Characteristic and Engineering Environment of Tianjin, Tianjin 300384, China

Received:2018-02-20 Revised:2019-04-26 Published:2020-11-02

摘要/Abstract

摘要： 为研究纵向肋条气动措施对斜拉索风雨激振现象的抑振机制,首先,建立可用于分析带有运动水线的不同气动外形斜拉索的风雨激振理论模型;然后,推导耦合的水膜运动方程和拉索振动方程;最后,采用该理论模型系统分析带有不同个数纵向肋条的斜拉索的振动响应、水膜形态特征以及拉索表面气动升力和阻力的变化特性等。结果表明:纵向肋条会阻碍上水线的形成,通过增加拉索表面的纵向肋条个数,可降低拉索发生风雨激振的风险;当拉索沿环向布置12根纵向肋条时,水线运动的主频已远远偏离拉索的固有频率,在保证风阻系数小的同时降低拉索的横风向振幅,减振效果最佳。

关键词: 风雨激振, 数值模拟, 上水线, 气动力, 纵向肋条

Abstract: This paper is presented in order to study the mitigation mechanism of longitudinal ribs on rain-wind-induced vibration. Firstly, a theoretical vibration model of stay cables with kinetic rivulet which could be used for different aerodynamic shapes was established. Then the coupled water film oscillation and cable vibration equations were deduced. Finally, the theoretical model was used to study cable vibration response, water film features and changes of aerodynamic lifts and drags of stay cables with different longitudinal ribs. The results show that longitudinal ribs could suppress the formation of upper rivulet, and the increase of longitudinal ribs number could reduce the occurrence of rain-wind-induced vibration; the mitigation effect will be the best when the stay cable is installed with 12 longitudinal ribs since the dominant frequency of water film will deviate from the inherent frequency of stay cables, thus reducing the amplitude of crosswind while ensuring the drag coefficient is small and the amplitude of stay cable is decreased, the mitigation effect is the best.

Key words: rain-wind- induced vibration, numerical simulation, upper rivulet, aerodynamic forces, longitudinal ribs

中图分类号:

X966

毕继红, 乔浩玥, 关健, 王剑. 纵向肋条对斜拉索减振特性的影响研究[J]. 中国安全科学学报, 2019, 29(6): 134-139.

BI Jihong, QIAO Haoyue, GUAN Jian, WANG Jian. Analysis of mitigation effect of longitudinal ribs on stay cable[J]. China Safety Science Journal, 2019, 29(6): 134-139.

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纵向肋条对斜拉索减振特性的影响研究

Analysis of mitigation effect of longitudinal ribs on stay cable

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