摘要
基于滑移理论,研究了带有凹槽的斜拉索在风雨作用下的减振效果.为建立模型,通过COMSOL软件计算了相应的风压系数和风摩擦系数.将计算结果代入MATLAB软件,求得拉索在风雨激振下的振动响应、气动升力、表面某一点处水膜厚度以及水膜变化全过程,用于分析影响凹槽对斜拉索减振效果的影响.结果显示:虽然凹槽不能够阻止水线在斜拉索表面的形成,但与不带凹槽的斜拉索相比,斜拉索振动幅值显著降低;水膜厚度变化频率远大于斜拉索自振频率,导致气动升力的变化频率远大于拉索自振频率;振动的频率相关性大大降低,从而斜拉索的升力周期性特性变弱,抑制了斜拉索在横风向的大幅振动.
The vibration damping effect of stay cable with a groove under the action of wind and rain is studied based on the lubrication theory.To establish the model,the corresponding wind pressure coefficient and wind friction coefficient are both calculated by COMSOL software.The vibration response of the cable under wind and rain,the aerodynamic lift of the cable,the shape of the water film and the thickness of the water film at a certain point around cable are obtained by MATLAB software,which are used to analyze the influence of groove on the damping effect of stay cable.The results show that,the vibration amplitude of the stay cable with groove significantly decreases comparing with circular cables,although the groove cannot hinder the formation of upper rivulet.The frequency of water film variation is much higher than cable natural frequency,which leads to the result that the frequency of cable lift is much higher than cable natural frequency.The large amplitude vibration of cable in across-wind direction is suppressed by the significant decrease in the relationship between rivulets and cable,which reduces the periodicity characteristics of the lift.
作者
戚永圣
王剑
乔浩玥
关健
周燕
张凯
QI Yongsheng;WANG Jian;QIAO Haoyue;GUAN Jian;ZHOU Yan;ZHANG Kai(Tianjin Chengjian University,Tianjin 300384,China;Tianjin University,Tianjin 300072,China;Tianjin Municipal Engineering Design&Research Institute,Tianjin 300191,China)
出处
《天津城建大学学报》
CAS
2021年第4期229-236,共8页
Journal of Tianjin Chengjian University
基金
天津市自然科学基金(17JCYBJC22300,18JCQNJC08300,18JCYBJC90800)
道路结构与材料行业重点实验室基金项目(310821171114)
天津市交通运输科技发展计划项目(2014KYJJQL23)。
关键词
风雨激振
气动减振
凹槽
滑移理论
rain wind induced vibration
aerodynamic damping
groove
lubrication theory
