500 kV鼓型高压输电塔的稳定性分析和加固  

STABILITY ANALYSIS AND REINFORCEMENT OF 500 KILOVOLTS DRUM-TYPE HIGH-VOLTAGE TRANSMISSION TOWER

作　　者：周伟才 刘丙财 林华盛 张有佳[2] ZHOU Weicai;LIU Bingcai;LI Huasheng;ZHANG Youjia(Shenzhen Power Supply Bureau,Shenzhen 518000,China;Architecture Engineering College,Northeast Dianli University,Jilin 132012,China)

机构地区：[1]深圳供电局有限公司,广东深圳518000 [2]东北电力大学建筑工程学院,吉林吉林132012

出　　处：《工业建筑》2019年第12期47-51,68,共6页Industrial Construction

基　　金：国家自然科学基金项目(51508074);南方电网科技项目(090000KK52170020)

摘　　要：输电塔的局部失稳是导致输电铁塔倒塌的重要原因。通过将风速转换为风压并施加于按实际等比例建立的ANSYS有限元模型中,并考虑二次应力影响和角钢朝向问题。根据屈曲系数分析输电铁塔的稳定性。研究结果表明:随着输电塔结构构件加固程度的增加,屈曲荷载因子逐渐增大,屈曲位置也逐步上移;当干字型输电塔下横担塔身部位加固完成后,屈曲位置上移至横担部位腹杆处。T字型比十字型和Z字型加固方式屈曲荷载因子分别提升了约39%和25%,可有效提升线路安全运行能力。Local instability of transmission towers is an important cause of the collapse of transmission towers.In the paper,the wind velocity was converted to the wind pressure and was applied to the full-scale ANSYS finite element model,and the secondary stress effects and angle steel orientation were considered.According to the buckling coefficients,the stability of transmission tower was analyzed.The results showed that the buckling coefficients increased and the buckling position moved upward gradually with the increase of the reinforcement main member state of the transmission tower,and when the tower body below the cross arm of G-type transmission tower were strengthened,the position of the buckling was moved to the web member of the cross arm.The buckling coefficients of the T-type reinforcement was higher than that of the cross type and the Z-type reinforcement by about 39%and 25%cross arm respectively,which could effectively improve the safe operation capacity of the line.

关 键 词：输电塔 屈曲分析 局部加固 组合截面 

分 类 号：TM75[电气工程—电力系统及自动化]