输电线路钢管塔典型节点涡激振动疲劳性能试验研究  

Experimental study on vortex-induced fatigue performance of typical joints of steel tube towers in transmission lines

作　　者：姜岚[1,2] 王清源 罗曼平 田雷 侯中伟 高一然 JIANG Lan;WANG Qingyuan;LUO Manping;TIAN Lei;HOU Zhonguwei;CAO Yiran(College of Electrical and New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Yichang 443002,China;State Grid Hunan Electric Power Co.,Ltd.,Loudi Power Supply Branch,Loudi 417000,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]湖北省输电线路工程技术研究中心,湖北宜昌443002 [3]国网湖南省电力有限公司娄底供电分公司,湖南娄底417000 [4]国网经济技术研究院有限公司,北京102209

出　　处：《振动与冲击》2024年第24期145-154,共10页Journal of Vibration and Shock

基　　金：国家电网有限公司科技项目(5200-202156071A-0-0-00)。

摘　　要：在输电线路运行过程中,钢管塔杆件涡激振动是节点部位产生疲劳裂纹主要原因之一。为揭示钢管塔典型节点疲劳破坏机理,获取节点的S-N曲线,开展钢管塔两种典型节点的涡激振动疲劳试验。设计节段模型试件,并通过数值计算方法验证其等效性,设计加载装置与加载制度,开展针对C型节点与X型节点的疲劳试验。结果表明:钢管塔典型节点的疲劳热点位于结构连接焊缝的焊趾处,疲劳荷载多次作用之后,在疲劳热点处形成向两侧扩展的疲劳裂纹,当裂纹达到临界尺寸时,试件迅速断裂;根据第一外推点应变幅值变化曲线,可将节点疲劳破坏过程大致分为弹性阶段、塑性阶段与破坏阶段,应变幅值转折点对应的加载次数可以作为节点的疲劳寿命;得到了钢管塔C型与X型节点的95%存活率下的热点应力幅-疲劳寿命曲线,为特高压输电线路钢管塔工程设计提供参考。During the operation of transmission lines,the vortex-induced vibration of steel pipe tower is one of the main causes of fatigue cracks in joint parts.In order to reveal the fatigue failure mechanism of typical joints of a steel tube tower,the S-N curves of the joints were obtained,and the fatigue tests of two typical joints of the steel tube tower were carried out.The section model specimens were designed,and their equivalence was verified by numerical calculation.The loading device and the loading system were designed,and fatigue tests were carried out for C-type nodes and X-type nodes.Results show that the fatigue hot spot of typical joints is located at the toe of the welded joint of the structure.After repeated action of fatigue load,fatigue cracks are formed at the fatigue hot spot,and when the cracks reach the critical size,the specimens break rapidly.According to the change curve of strain amplitude at the first extrapolation point,the fatigue failure process of the node can be roughly divided into elastic stage,plastic stage and failure stage,and the loading times corresponding to the turning point of strain amplitude can be used as the fatigue life of the node.The hot spot stress amplitude-fatigue life curves of C-type and X-type joints with 95%survival rate are obtained,which can provide reference for engineering design of UHV transmission lines.

关 键 词：钢管塔 节点 涡激振动 热点应力法 疲劳试验 S-N曲线 

分 类 号：TH726.3[机械工程—仪器科学与技术]