斜拉桥拉索风—雨致振动特性风洞试验研究  

Study on rain-wind induced vibration of cables in cable-stayed bridges by wind tunnel test

作　　者：李永乐[1] 卢伟[2] 陶齐宇[3] 熊文斌[2] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031 [2]四川公路桥梁建设集团有限公司,四川成都610041 [3]四川省交通厅公路勘察设计研究院,四川成都610041

出　　处：《实验流体力学》2007年第4期36-40,44,共6页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金资助项目(50778155);教育部新世纪优秀人才支持计划(NCET-06-0802);西南交通大学科技发展基金(2005A05);四川省交通厅科技计划项目(SC20050042)

摘　　要：以宜宾长江大桥为工程背景,在对斜拉索特性进行统计的基础上,确定了有代表性的模型风洞试验参数。通过较为系统的模型风洞试验,讨论了来流风速、索水平倾角、来流风向角、降雨量及结构阻尼比等对斜拉索风—雨致振动性能的影响。研究结果表明:在α=25°3、0°且β=25°、30°、35°组合情况下斜拉索易发生雨振,其中心发振风速约为12m/s;斜拉索在小雨甚至'毛毛雨'的情况下易发生雨振;斜拉索雨振对结构阻尼比较为敏感。Yibin Yangze River Bridge was regarded as a typical example of cable stayed bridge in this paper. Characteristics of cables of this bridge were investigated by the statistical method to determine the model parameters for wind tunnel tests. A series of wind tunnel tests were carried out to explore the effect of wind speed, inclined angle, yaw angle, rain precipitation and structural damping ratio on the rain-wind induced vibration of cables in cable-stayed bridges. The results show that cables are prone to rain-wind induced vibration in the combination of α= 25°, 30°and β= 25°. 30°. 35° at the predominate wind speed of about 12m/s. Lighter rain can promate the rain-wind induced vibration of cables, and the rain-wind induced vibration is sensitive to the structural damping ratio.

关 键 词：斜拉桥 斜拉索 风-雨致振动 风洞试验 气动特性 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程] V211.74