摘要
以某大跨越输电塔典型钢管为研究对象,开发微风振动流固耦合程序,结合杆件动力特性分析结果、流固耦合理论及结构动力学求解方法,引入考虑钢管节点约束的增大系数,数值模拟不同涡激振动响应,表明典型工况的频率成分单一,最大数值对应的频率近似钢管一阶自振频率,对比现场监测信息,验证了数值模型描述实际钢管微风振动响应的可靠性;并通过不同时刻的湍流动能揭示了2个分离剪切层的相互作用主控漩涡模式的重要机理;分析了微风风速、湍流度、质量比、阻尼比、质量阻尼比、风向角等主控因素对其涡激响应的影响规律,通过不同工况的振动位移、升力系数、阻力系数演化特征揭示了钢管微风振动机理。
This paper takes a typical steel tubular column from a large-span transmission tower as the research object.A fluid-solid coupling program is proposed for vortex-induced vibration analysis,integrating the dynamic characteristics of the rod,fluid-structure coupling theory,and structural dynamics solution methods.An increase factor that accounts for the joint constraints of the steel pipe is introduced.Numerical simulations are conducted to model different vortex-induced vibration responses.Results indicate under typical conditions,there is only one frequency component,with the peak frequency closely resembling the first-order natural vibration frequency of the steel tubular column.The reliability of the numerical model is validated by comparing monitoring data to describe the vibration response of the columns in the real-time breeze conditions.The interaction mechanism between two separated shear layers is elucidated through an analysis of turbulent kinetic energy at various time points.Moreover,the influence of wind velocity,turbulence intensity,mass ratio,damping ratio,mass-damping ratio,and wind direction angle on vortex-induced responses is examined.Through the evolution characteristics of vibration displacement,lift coefficient and drag coefficient under different conditions,breeze induced steel tubular vibration mechanism is investigated.
作者
程燕军
苏仁斌
熊卫红
刘先珊
黄子宣
曹伊婷
CHENG Yanjun;SU Renbing;XIONG Weihong;LIU Xianshan;HUANG Zixuan;CAO Yiting(Central China Branch of State Grid Corporation of China,Wuhan 430072,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《重庆理工大学学报(自然科学)》
北大核心
2025年第8期190-197,共8页
Journal of Chongqing University of Technology:Natural Science
基金
国家电网公司华中分部科技项目(52140024000K)。
关键词
高压输电塔钢管
流固耦合
微风振动
漩涡
steel tubular columns for UHV transmission lines
fluid-solid coupling
breeze vibration
vortex
