不同预应力施加方式对预绞式金具紧固性能的影响  

Effect of Different Prestressing Methods on Fastening Performance of Pre-twisted Fittings

作　　者：刘菊芳 刘小会[1,2] 陶亚光 张博 杨晓辉 刘鹏[1] 张春霞 LIU Jufang;LIU Xiaohui;TAO Yaguang;ZHANG Bo;YANG Xiaohui;LIU Peng;ZHANG Chunxia(School of Civil Engineering,Chongqing Jiaotong Univ.,Chongqing,400074,China;Chongqing Jiao-tong Univ.,State Key Laboratory of Bridges&Tunnels in Mountainous Areas,Chongqing 400074,China;Henan Electric Power Research Institute,Zhengzhou 450052,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [3]国家电网河南省电力公司电力科学研究院,郑州450052

出　　处：《三峡大学学报（自然科学版）》2022年第1期94-100,共7页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金项目(51308570,51808085,51507106);重庆市研究生科研创新项目(CYS19240);重庆市科委基础科学与前沿技术研究项目(cstc2017jcyjAX0246);重庆市教委科学技术研究项目(KJ201600712182)。

摘　　要：预绞式金具作为输电线路的重要部件,可起到保护输电线路安全运行的作用.由于预绞式金具形成的内径小于导线直径,会产生预紧力作用.本文借助ABAQUS有限元软件采用等效降温法、ODB导入法和过盈接触法赋予耐张型预绞式金具一个预紧力,模拟单根耐张型预绞式金具缠绕在导线上的不同工况,基于数值仿真结果研究了不同预应力施加方式对耐张型预绞式金具紧固性能的影响.结果表明:应力最大值出现在耐张型预绞式金具施加荷载的端部;节距增加,过盈法中的精确过盈量逐步减小,降温法设置的降温数值减小;采用降温法时无论何种工况下耐张型预绞式金具的仿真握力值最大,能为预应力的模拟提供参考.The pre-twisted fittings play an important role in protecting the safe operation of transmission lines as an important part of transmission lines.The pre-tightening force will be produced because the inner diameter of the pre-twisted fittings is smaller than the diameter of the conductor.In this paper,the equivalent cooling method,the ODB import method and the interference contact method are used to give a pre-tightening force to the tension type pre-twisted fittings with the help of ABAQUS finite element software,and the different working conditions are simulated for a single tension type pre-twisted fittings winding on the wire.Based on the numerical simulations,the influence of different prestressing methods on the fastening performance of the tension type pre-twisted fittings is studied.The results show that the maximum stress appears at the end of the load exerted by the tension type pre-twisted fittings.Moreover,the precise interference in the interference method gradually decreases with the increase of the pitch,and the cooling value set by the cooling method decreases.Furthermore,no matter what working condition,the simulation grip value of the tension type pre-twisted fittings is the maximum while the cooling method is used,which provides reference value for the simulation of pre-stress.

关 键 词：ABAQUS 降温法 ODB导入法 过盈接触法 耐张型预绞式金具 紧固性能 

分 类 号：TM752[电气工程—电力系统及自动化] TU502[建筑科学—建筑技术科学]