摘要
格构式输电铁塔主要以单角钢作为主材。大量输电铁塔倒塌是由于铁塔的塔腿主材部位发生失稳。因此,对存在安全隐患的输电铁塔主材进行加固补强尤为重要。以单根主材为研究对象,应用十字形夹具式主材加固方法,建立了主材加固前、后的有限元模型,分析了夹具数量、夹具间距、副主材长度、螺栓预紧力和摩擦系数等参数对主材极限承载力的影响规律。结果表明:随着夹具间距的减小和夹具数量的增多,主材极限承载力先逐渐增大后趋于平缓;副主材长度过短起不到加固的作用,建议副主材长度不小于主材长度的1/2。
The latticed transmission tower is mainly built by using single angle steel.The collapse of a large number of transmission towers is due to the instability of the main part of tower legs.Therefore,it is important to reinforce and strengthen the main legs of transmission towers to avoid collapse.In this paper,a finite element model of single main leg before and after reinforcement is built by using the method of cruciform fixture.The influences of the fixture number,the fixture spacing,the length of auxiliary main material,preload on bolts and friction coefficient on the ultimate bearing capacity of the main material are analyzed.The results show that the ultimate bearing capacity of the main leg increases gradually and then flattens with the decrease of fixture spacing and the increase of fixture number.It is suggested that the reinforcement length of secondary main leg should not be less than 50%of the length of main leg.
作者
江文强
陈欣阳
JIANG Wenqiang;CHEN Xinyang(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2022年第2期97-104,共8页
Progress in Steel Building Structures
基金
国家自然科学基金(51408221)
中央高校基本科研业务费专项资金(2018MS119)
国家电网公司总部科技项目(SGHEBD00FCJS2000217)。
关键词
输电铁塔
主材
加固
十字形夹具
极限承载力
transmission tower
main leg
reinforcement
cruciform fixture
ultimate bearing capacity
