1000 kV格构式独立避雷线塔风致响应分析

Wind-Induced Response Analysis of 1000 kV Lattice Independent Lightning Protection Tower

[目的]为对1000 kV格构式独立避雷线塔风致响应进行研究,并提出其合理的风振系数取值。[方法]文章以1000 kV格构式独立避雷线塔为研究对象,借助有限元软件ANSYS,以《建筑结构荷载规范》所采用的Davenport脉动风速功率谱密度函数为基础,基于结构随机振动理论以及频域分析方法,分析了该类型避雷线塔的风致响应,并与《高耸结构设计标准》推荐的简化公式所得风振系数值进行对比。[结果]分析结果表明:在B类地貌、基本风压不大于0.60 kN/m^(2)时,该避雷线塔总体变形满足规范要求;《高耸结构设计标准》推荐的简化公式所得风振系数值以及《变电站建筑结构设计技术规程》建议值总体小于有限元分析所得值,结构设计时应特别注意。[结论]根据本文对比分析结果,推荐1000 kV格构式独立避雷线塔结构设计时,风振系数可统一取2.20。

[Introduction]This paper is aimed to study the wind-induced response of 1000 kV lattice independent lightning protection tower and propose the reasonable value of wind-induced vibration coefficient.[Method]The wind-induced response of 1000 kV lattice lightning protection tower was analyzed in this paper with the help of finite element software ANSYS based on the Davenport fluctuating wind speed power spectral density function adopted in the Load Code for Building Structures and the structural random vibration theory and frequency domain analysis method.The wind-induced vibration coefficient was compared with that calculated by the simplified formula recommended in the Standard for Design of High-Rising Structures.[Result]The analysis results show that the overall deformation of the lightning protection tower meets the specification requirements for the class B landform when the basic wind pressure is not greater than 0.60 kN/m^(2);The wind vibration coefficient value obtained from the simplified formula recommended in the Standard for Design of High-Rising Structures and the recommended value in the Technical Code for the Design of Substation Buildings and Structures are generally smaller than the value obtained from the finite element analysis,so special attention should be paid to it during structural design.[Conclusion]According to the comparative analysis results of this paper,it is recommended that the wind-induced vibration coefficient can be uniformly taken as 2.20 during the structural design of 1000 kV lattice independent lightning protection tower.