摘要
输电塔主材改用复合材料,可有效减少输电线路占地,并减少电气间距达到压缩走廊的目的。复合材料区别于角钢,可以使用D字型截面,提高了截面惯性抵抗矩。对各规格复合材料构件的截面进行了有限元分析,计算得到了截面特性参数。以某110 k V塔头复合材料塔为工程背景,建立了有限元模型,获得了其自振特性并与传统角钢塔做了对比,分析了参数不同的原因。使用基于时域法的风振系数计算,对位移均方根值、位移平均值、加速度均方根值的分布特点进行了研究,计算了各高度处的风振系数,并将结果与我国规范的取值进行了对比,结果可作为复合塔抗风设计的参考。
By adopting composite materials as the main structure of transmission towers, both the floor space and electrical distance of transmission lines are reduced effectively, which can realize transmission corridor compression. Other than the angle iron, composite materials can adopt D-shaped cross section which increases the sectional resistance moment. In this paper, the finite element analysis on the section of the composite materials of different types is conducted to calculate the sectional characteristics. Based on a typical case of 110-kV transmission tower which is equipped with a tower head made of composite material, a precise finite element model is established and the vibration characteristics of the structure are obtained and compared to those of traditional angle steel towers with cause analysis being carried out. The distribution characteristics of RMS displacement, mean displacement and RMS acceleration are studied with the calculation of time domain based wind vibration coefficient. Meanwhile, the wind vibration coefficient at different transmission tower heights are obtained and compared with the standard values set by China. The result of this paper can be used as reference for wind resistance design of composite towers.
出处
《中国电力》
CSCD
北大核心
2015年第3期99-102,121,共5页
Electric Power
关键词
D字型截面
复合材料
输电杆塔
自振特性分析
风振系数
有限元分析
结构设计
D-shaped cross section
composite materials
transmission tower
analysis of natural vibration characteristics
wind vibration factor
finite element analysis
structure design
