摘要
采用ANSYS软件建立了华东电网某500kV高压输电线路结构的三塔两线空间有限元模型,将线路实测的台风"韦帕"风速记录转换为风荷载,进行了该塔线耦联体系的非线性风振响应分析,有限元模型计算结果与现场实测加速度响应吻合较好,说明文中建立的高压输电线路结构的有限元模型是合理的,可以较为准确地分析塔线耦联体系的风振响应。在此基础上,研究了设计风速作用下塔线耦联体系的风振响应,并与规范拟静力响应作了比较。结果表明:在设计风速时,线路中输电塔主要受力构件的内力接近钢材的屈服强度设计值,有引发塔架破坏的可能。按现行输电线路结构设计规程设计的输电塔结构在设计风速作用时是偏于不安全的,输电线路结构设计时需要考虑塔线之间的耦合作用对输电塔动力响应的影响。
Abstract： A three-dimensional finite element model of a 500 kV high-voltage transmission tower-line coupling system in the east China power grid is built using ANSYS software. The characteristics of free vibration and nonlinear wind-induced vibration of the tower-line system are studied in detail based on the wind load converted from the field measured data of Typhoon ＂Weipa＂ wind speed records. It is shown that, the computational results from FE model are in good agreement with the acceleration responses observed on the site, which indicated that the finite element model of high-voltage transmission tower-line coupling system built is reliable, and can be used to analyze accurately the nonlinear wind-induced vibration response of the tower-line system. On this foundation, the design wind vibration response of the tower-line system is studied and compared with the standard pseudo static response. The results show that： the coupling effect between tower and conductors is very intensive; in the design wind speed, the dynamic stress of the main component of transmission tower can reach yield strength value of thesteels, which can cause the tower collapse. If the design is conducted according to the existing transmission line structure design code, in the design wind speed, the tower structure is unsafe. When designing the structures of transmission tower-system, the contribution of the nonlinear vibration of conductors to the tower dynamic characteristics should be taken into account
出处
《自然灾害学报》
CSCD
北大核心
2014年第1期64-74,共11页
Journal of Natural Disasters
基金
国家自然科学基金资助项目(51108425
50778135)
国家自然科学基金委创新研究群体资助项目(50621062)
关键词
高压
输电塔线体系
风振响应
有限元分析
现场实测
耦合振动
high voltage transmission tower-line coupling system
wind-induced vibration response
finite elementanalysis
field measure
coupling vibration
