（1 武汉理工大学道路桥梁与结构工程湖北省重点实验室，  武汉 430070； 2 广东省广州市增城城乡规划局， 广州 510000)

［摘要］斜拉索偏心覆冰后，气动外形不再稳定，在风荷载作用下，可能诱发驰振。主要对三维扇形覆冰斜拉索以及串列双索尾流驰振进行研究。首先应用FLUENT中的SST k\|ω模型对三维扇形覆冰斜拉索及串列双索的绕流场进行数值模拟，得到全向角下的阻力系数、升力系数及驰振力系数，然后依此判定覆冰斜拉索是否发生驰振，并得到某大跨斜拉桥部分斜拉索的驰振临界风速。数值分析结果表明，经过三维模拟计算的扇形覆冰直索及斜索的驰振力系数均大于零，表明在模拟的工况下，扇形覆冰单索在风荷载作用下不会发生驰振；而串列双索会在40°左右存在驰振力系数小于零的区域，会发生尾流驰振，但驰振临界风速很小。

［关键词］扇形覆冰； 单索双索； 气动力参数； 尾流驰振； 临界风速

中图分类号：U448-27文献标识码：A文章编号：1002-848X(2019)09-0120-07

Analysis of wind-induced vibration   and wake  galloping  for  3D fan-shaped single cable and  tandem double cables with iced accretion

Tan Dongmei1， Luo Suzhen1， Qu Weilian1， Wang Kaili2， Mao Shanming1

(1 Hubei Key Lab of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070，China；2 Urban and Rural Planning Bureau of Zengcheng，Guangzhou City, Guangdong Province, Guangzhou 510000，China)

Abstract:After eccentric iced accretion, the aerodynamic shape of the stay cable is no longer stable, which may induce galloping vibration under wind load. Wake galloping analyses of 3D fan-shaped single stay cable with iced accretion and  tandem double cables with iced accretion were conducted. Firstly, the SST k-ω model in FLUENT was used to simulate the flow field around the 3D fan-shaped single stay cable with iced accretion and  tandem double cables with iced accretion, to obtain the drag coefficient, lift coefficient and galloping force coefficient under the omnidirectional angle. Then, it was determined whether the fan-shaped stay cable with iced accretion occured galloping, and the critical wind speed of the partial cable stay of a large-span cable-stayed bridge was obtained. The results of numerical analysis show that the galloping force coefficient of the fan-shaped stay cable and straight cable with iced accretion calculated by 3D simulation are greater than zero. This indicates that under the simulated working condition, the fan-shaped single cable with iced accretion would not gallop under the wind load. However, the tandem double cables would have a region where the galloping force coefficient is less than zero at around 40°, and wake galloping would occur, but the critical wind speed of the galloping is small.

Keywords:fan-shaped iced accretion; single cable and double cables; aerodynamic parameter; wake galloping; critical wind speed

*国家自然科学基金资助项目（51408452），湖北省重点实验室开放基金资助项目（DQJJ201509）。

作者简介：谭冬梅，博士，副教授，Email:smiledongmei@163.com。