±800kV特高压T型长横担输电塔风振特性研究  

Wind-induced Dynamic Response and Vibration Characteristics of T-Long Cross Arm Transmission Tower for±800kV UHV Lines

作　　者：聂建波 潘峰[2] 沈建国[2] 郑剑伟[2] 

机构地区：[1]浙江省电力物资供应公司,杭州310003 [2]浙江省电力设计院,杭州310012

出　　处：《特种结构》2013年第1期48-52,39,共6页Special Structures

摘　　要：±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 T-Long cross arm transmission tower is a new tower type of the transmission line. With the complex interaction between wind and structure, DC transmission tower belongs to wind-sensitive structures and the wind load becomes the main problem of the structure design. Based on the engineering background of a ＋800kV DC transmission tower, a precise finite element model was established and the vibration characteristics of structure have been obtained. The time history of fluctuating wind load was accurately simulated by considering the spatial correlation of Kaimal wind spectrum. Combination of dynamic time-integration method, the wind-induced vibration responses of the tower were obtained in the time domain. The characteristics of Mean displacement Rms displacement and Rms acceleration at different layer of transmission tower have been analyzed in a detailed. Meanwhile, the wind-induced vibration coefficient at different layer of transmission tower were also studied and compared with the specification in our country, respectively. Through research, some characteristics of wind-induced vibration of DC transmission tower were revealed and the procedure and the results presented in this paper can be used as reference for the design of DC transmission tower.

关 键 词：直流塔 有限元模型 风荷载模拟 时程分析 风致响应 风振系数 

分 类 号：TU347[建筑科学—结构工程] TU312.1