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±800kV特高压直流塔是T型长横担输电塔型,属于风敏感结构,风与结构的相互作用十分复杂,风荷载常常是设计的主要控制荷载。本文以某一±800kV直流塔为工程背景,建立了详细的有限元计算模型,获得了结构的自振动力特性。在考虑节点风荷载空间相关性的基础上,利用Kaimal谱对结构的风荷载进行了准确的数值模拟。结合动力时程积分法,计算得到了结构的风致振动响应时程。研究了结构位移平均值、位移均方根值和加速度均方根值的分布特点,同时分析了结构各层的风振系数分布特点,并与我国规范进行了对比。通过研究,揭示了直流塔的风致振动特性,结果可作为直流塔结构抗风设计的参考。
± 800kV UHVDC tower is a T-type long-haul overhead transmission tower. It belongs to the wind-sensitive structure. The interaction between wind and structure is very complicated. The wind load is often the main control load of the design. In this paper, a ± 800kV DC tower is taken as the engineering background, a detailed finite element model is established, and the self-vibration dynamic characteristics of the structure are obtained. Based on the spatial correlation of wind loads on nodes, the Kaimal spectrum is used to carry out accurate numerical simulation of wind loads. Combined with dynamic time-integration method, the time-history of wind-induced vibration response of the structure is calculated. The distribution characteristics of the average value of structural displacement, the root mean square of displacement and the rms value of acceleration are studied. The distribution characteristics of wind vibration coefficient at each layer of the structure are analyzed and compared with our country’s standard. Through the research, the wind induced vibration characteristics of the DC tower are revealed, and the results can be used as a reference for wind resistance design of the DC tower structure.