螺旋线对斜拉桥斜拉索横风向气动力和稳定性的影响  

Effect of helical line on the aerodynamic force and stability of stay cables

作　　者：刘庆宽 王晓江[3] 卢照亮 胡波 马文勇 LIU Qingkuan;WANG Xiaojiang;LU Zhaoliang;HU Bo;MA Wenyong(Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;Hebei Province Key Lab of Structural Health Monitoring and Control, Shijiazhuang 050043, China;Shool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China)

机构地区：[1]石家庄铁道大学大型结构健康诊断与控制研究所,石家庄050043 [2]河北省大型结构健康诊断与控制重点实验室,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043 [4]石家庄铁道大学工程力学系,石家庄050043

出　　处：《振动与冲击》2019年第6期108-113,共6页Journal of Vibration and Shock

基　　金：国家自然基金(51778381);河北省自然科学基金(E2018210044)

摘　　要：在斜拉索表面缠绕螺旋线能有效抑制斜拉索风雨激振现象,但却改变了斜拉索的气动外形。为了研究不同螺旋线参数对斜拉索气动稳定性的影响,该试验通过自行设计的斜拉索测振试验系统,在风洞中对直径为120 mm的斜拉索模型和25种螺旋线斜拉索模型进行了刚性模型测振试验。分析了各工况下斜拉索平衡位置和平均升力系数随雷诺数的变化规律。结果表明:在相同螺旋线直径下,螺旋线缠绕间距越小,斜拉索模型的升力越小、平衡位置偏移量越小;在相同缠绕间距下,螺旋线直径越大,斜拉索模型的平均升力越小、平衡位置改变量越小;当缠绕间距越小或螺旋线直径越大,改变另一个参数对平衡位置偏移量产生的影响越小;当螺旋线缠绕间距越大,平衡位置稳定性越差。The helical line on the surface of cables can effectively suppress the wind and rain excitation on the cables, but it will change its aerodynamic shape. A vibration test system for stay cables was designed to study the effects of different parameters of helical lines on the aerodynamic stability of oblique cables, and 25 kinds of helical line models for 120 mm-diameter stay cables were tested for vibrations in a wind tunnel.The relationship of the equilibrium positions and average lift coefficients of stay cables with the Reynolds numbers were analyzed.According to the results, with the same diameter of helical line, the smaller the helical line winding distance is, the smaller the lift force of the cable model is, and the smaller the equilibrium position offset is. With the same helical line winding distance, the average lift forces and the equilibrium position offset of stay cables become smaller with the increase of helical line diameter. The effect of the change of another parameter on the equilibrium position offset becomes small with the decrease of helical line winding distance or the increase of helical line diameter. And the larger the helical line winding distance is, the worse the equilibrium position stability is.

关 键 词：螺旋线 斜拉索 雷诺数 气动力 气动稳定性 

分 类 号：TU312[建筑科学—结构工程]