基于概率密度演化的大跨越导线铝部风振疲劳可靠度分析  

Reliability Analysis of Wind Induced Fatigue of Aluminum Part of Long Span Conductors Based on Probability Density Evolution

作　　者：汪峰[1,2] 洪磊 刘章军 黄金山 WANG Feng;HONG Lei;LIU Zhangjun;HUANG Jinshan(Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,Hubei,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,Hubei,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430074,Hubei,China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]武汉工程大学土木工程与建筑学院,湖北武汉430074

出　　处：《力学季刊》2024年第2期543-554,共12页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51978543);中国能源建设集团规划设计有限公司科研项目(GSKJ2-D03-2020)。

摘　　要：为了掌握微风作用下大跨越架空输电导线铝股疲劳特性及其可靠度,提出了基于概率密度演化的大跨越输电导线铝部疲劳可靠度计算方法.首先建立了大跨越塔线体系有限元模型,研究了微风激振下导线悬挂点处振动位移时程,然后构建了导线节段有限元实体模型,以微风激振作用下导线位移时程为激励,研究了大跨越导线内外层铝股风振疲劳应力时程响应,最后采用概率密度演化方法,考虑线路风速风向概率分布,分析了大跨越导线疲劳可靠度,并与Miner线性累积损伤结果进行比较.结果表明:微风风速越大,大跨越导线振幅越大;微风作用下大跨越导线的外层铝股应力大于内层铝股,外层的钢股应力亦大于内层;大跨越导线运行年限越大,导线内外层铝股可靠度越小,但内层铝股可靠度大于外层铝股可靠度;基于Miner原理计算的铝股疲劳可靠度偏大,建议开展大跨越输电导线疲劳设计时考虑分层特性.In order to grasp the fatigue characteristics and reliability of aluminum strands of long span overhead transmission lines under the loads of gentle winds,a probability density evolution based calculation method for the aluminum fatigue reliability of long-span transmission lines is proposed.Firstly,a finite element model of the large span tower line system was established,and the vibration displacement history at the suspension point of the wire under the gentle wind excitation was studied.Then,a finite element solid model of the wire segment was constructed,and the fatigue stress history response of the aluminum strands inside and outside the large span wire under the displacement-history wind excitation was studied.Finally,the probability density evolution method was used to analyze the fatigue reliability of large span conductors,considering the distribution probability of wind speed and direction.The results were compared with those of the Miner's linear cumulative damage.The results show that the higher the breeze wind speed,the greater the vibration amplitude of the large span wire.Under the action of gentle winds,the stress of the outer aluminum strand of the large span conductor is greater than that of the inner aluminum strand,and the stress of the outer steel strand is also greater than that of the inner layer.The longer the service life of a large span wire,the lower the reliability of the inner and outer aluminum strands of the wire.Nevertheless,the reliability of the inner aluminum strands is stronger than that of the outer aluminum strands.The fatigue reliability of aluminum strands based on Miner's principle is relatively larger.It is recommended to consider the delamination characteristics in the fatigue design of large span transmission lines.

关 键 词：大跨越输电导线 概率密度演化 微风振动 铝股应力 疲劳可靠度 

分 类 号：TM751[电气工程—电力系统及自动化]