摘要
庞大的输电系统是国家最重要的基础设施之一,确保其在长期风荷载作用下的安全性和可靠性,是应该重视的关键问题。采用Abaqus建立了输电塔线体系的精细化有限元模型,对风荷载进行了模拟,考虑受压杆件失稳,通过动力计算方法分析了塔线体系响应并据此确定了其薄弱位置。进一步地,以薄弱杆件的应力时程为指标,基于Miner线性准则描述的损伤规律,采用雨流法预测了不同风速下塔线体系的寿命;随后研究了风荷载模拟关键参数对结构预测寿命的影响,对线路进行整体上的评估。结果表明:以构件失效作为塔线体系结构整体破坏的准则,可为塔线体系的寿命预测提供一定的参考;结构的预测寿命主要由薄弱构件(变坡处主材)控制;此外,风荷载模拟参数对预测寿命有较大影响,持时不同预测寿命差距较大,Kaimal谱模型预测寿命比随机Fourier谱更偏于保守;粗糙长度与预测寿命负相关。
Huge power transmission system is one of the most important infrastructures in China and to assure its safety and reliability under the action of long term wind load is the key to be concerned.In this paper,a refined finite element model of transmission tower⁃line system is set up by Abaqus and the wind loads are simulated.Considering the instability of the stressed bar,the response of tower line is analyzed by the dynamic calculation method and,on this basis,its weak position is determined.Furthermore,the stress time history of weak bar is taken as a index,the life of tower line at different wind velocity is predicted by using the rain flow method on the basis of the damage law de⁃scribed by the Miner linear criterion.Then,the influence of the key parameters of wind load simulation on the struc⁃ture prediction life is studied and the liner is comprehensively assessed.The results show that taking the structure fail⁃ure as the failure criterion of the whole tower line system can provide a definite reference for life prediction of system.The prediction life of structure is mainly controlled by the weak structure main element(main material of slope place).In addition,the parameters of wind load simulation has large influence on the prediction life.The difference between different simulation time is large.Kaimal spectrum model is more conservative than that of random Fourier spectrum.And rough length is negatively correlated with prediction life.
作者
张刚
戴建强
谢强
李珊
赵龙
李中凯
李景华
ZHANG Gang;DAI Jianqiang;XIE Qiang;LI Shan;ZHAO Long;LI Zhongkai;LI Jinghua(State Grid Linyi Power Supply Company,Shandong Linyi 276000,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第2期200-209,共10页
High Voltage Apparatus
基金
国网山东省电力公司科技项目资助(逾龄架空输电线路杆塔智能健康诊断技术及应对策略研究)。
关键词
输电塔线体系
风振响应
雨流法
寿命预测
transmission tower⁃line system
wind load
rain flow method
life prediction
