斜拉索干索驰振机理的数值模拟与试验研究  

Numerical simulations and tests for dry galloping mechanism of stay cables

作　　者：李寿英[1] 曾庆宇[1] 温晓光[1] 陈政清[1] Li Shouying ZENG Qingyu Wen Xiaoguang Chen Zhengqing(Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha, China, 410082)

机构地区：[1]湖南大学风工程与桥梁工程湖南省重点实验室,长沙410082

出　　处：《振动与冲击》2017年第11期100-105,共6页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划(2015CB057701;2015CB057702);国家自然科学基金(51578234)

摘　　要：采用数值模拟和风洞试验方法,对斜拉索干索驰振机理进行研究。基于FLUENT商业软件平台,研究斜索和直索的风压系数、平均气动力系数、脉动气动力系数的轴向相关性等;进行粒子图像测速(PIV)风洞试验,对斜索尾流进行可视化显示,研究斜拉索背后的轴向流特性。研究结果表明:斜索的平均升力系数在特定的倾角和风攻角下会发生突降,其驰振力系数为较大的负值(-4.74),可能会发生驰振;斜索各截面气动力的轴向相关系数比直索要小,甚至会出现负的相关系数;在平均气动力系数突降的风攻角下,尾流中的轴向流不是非常明显,轴向流对于干索驰振的影响值得进一步定量研究。The mechanism of dry galloping of stay cable was studied by means of CFD simulations and wind tunnel tests. First, CFD simulations on 2-D and 3-D cable models were conducted by utilizing LES method incorporated in FLUENT software to obtain the wind pressure coefficients, mean drag and lift coefficients, correlation coefficients of fluctuating aerodynamic forces along the cable axis. Second, wind tunnel tests by using Particle Image Velocimetry （PIV） technique were carried out to specially investigate the characteristics of the flow in the cable wake. The results show that a sudden decrease of mean lift coefficient of the 3-D cable is observed, and a maximum minus galloping force coefficient, -4.74, is found. This means that large amplitude of galloping vibration of stay cable is possible to take place. Correlation coefficients of aerodynamic force coefficients on 3-D cable are smaller than the values of 2-D cable, and the correlations of drag coefficient are smaller than the values of lift coefficient. The axial flow behind 3-D cable is not obvious behind the inclined cable. The role of axil flow in cable vibration needs further quantitative investigations.

关 键 词：斜拉索 干索驰振 数值模拟 风洞试验 机理 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]