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

Abstract: 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.

Key words: D-shaped cross section, composite materials, transmission tower, analysis of natural vibration characteristics, wind vibration factor, finite element analysis, structure design