钢管塔杆件涡振对节点板疲劳寿命影响研究  

Fatigue life of joint plate induced by vortex-induced vibration of steel tube member

作　　者：李捷[1] 张宏杰 韩军科 李茂华 刘海锋 牛华伟[3] LI Jie;ZHANG Hong-jie;HAN Jun-ke;LI Mao-hua;LIU Hai-feng;NIU Hua-wei(State Grid Beijing Electric Power Company,Beijing 100031,China;China Electric Power Researah Institute,Beijing 100055,China;Wind Tunnel laboratory of Hunan University,Changsha 410082,China)

机构地区：[1]国网北京市电力公司,北京100031 [2]中国电力科学研究院有限公司,北京100055 [3]湖南大学风洞实验室,湖南长沙410082

出　　处：《煤炭工程》2020年第10期154-158,共5页Coal Engineering

基　　金：国家重点研发计划资助(2018YFC0809400)。

摘　　要：煤炭开采对电力需求日益增大,电网工程不断扩大,钢管塔结构数量不断增多,结构疲劳失效会影响煤矿供电安全。针对钢管杆件涡振引起节点板疲劳开裂事件,进行了周边环境分析、涡振频率识别、涡激力计算、节点板实体模型应力分析以及最短开裂时间估算等工作。研究表明:当杆件弱轴涡振时,节点板中间位置加劲肋最外缘处有明显的应力集中,最大应力幅可达77.83MPa,经疲劳寿命计算,开裂节点板加劲肋附近区域理论上有可能在4~5个月的时间内发生疲劳开裂,这与断口电镜扫描提示的多源疲劳开裂相吻合。为避免此类事件的发生,应当从规范化涡振幅值控制指标、研发更为灵活的涡振特征监测手段着手开展后续工作。With the increasing demand for power from coal mining,the power grid project is expanding,and the number of steel tube tower structures is increasing.The structural fatigue failure will affect the safety of coalmine power supply.In view of the fatigue cracking of joint plates caused by vortex-induced vibration of steel tubular members in UHV engineering,the surrounding environment analysis,Vortex frequency identification,vortex-induced force calculation,stress analysis of the solid model of the joint plate and the estimation of the minimum cracking time are carried out.The results show that there is obvious stress concentration at the outermost edge of the stiffening rib in the middle of the joint plate when the member occurring weak axis vibration.The maximum stress amplitude can reach 77.83 MPa.In theory,the fatigue cracking near the stiffening rib of the cracked joint plate may occur within 4-5 months,which is consistent with the multi-source fatigue cracking indicated by SEM.In order to avoid the occurrence of such events,the following work should be carried out by standardizing the Vortex amplitude control index and developing more flexible vortex characteristic monitoring means.

关 键 词：钢管塔 涡振 节点板 涡激力 疲劳寿命 

分 类 号：TM753[电气工程—电力系统及自动化]