摘要
以向家坝—上海、锦屏—苏南±800 kV特高压直流输电线路工程为例,介绍了橡胶铅芯阻尼器在一般线路输电塔风振控制中的应用。通过三维有限元仿真和风荷载的数值模拟,对单塔、输电塔—线体系在阻尼器控制前后的风振响应进行了时程分析。统计得到了输电塔结构的风荷载调整系数取值,并与多种现行规范的取值进行比较。结果表明,输电塔在横担位置风荷载调整系数存在突变现象,现行规范无法考虑这一影响,在设计时应引起重视;导(地)线使输电塔体系的质量、刚度和阻尼有所增加,从而产生了对塔架振动的抑制作用,因此在风振设计中应考虑塔线耦合的影响;输电塔—线体系采用橡胶铅芯阻尼器后风荷载调整系数得到有效减少且减少率沿塔高逐渐增大。
Based on the Xiangjiaba-Shanghai, Jinping-Sunan＇s special high-voltage DC ±800kV transmission line project, the lead rubber damper（LRD） applied for controlling wind-induced vibration of transmission towers is introduced. According to the numerical simulation of three dimensional finite element and wind loads, the wind-induced vibration response of single-tower and tower-line under wind load are obtained, the effects of wind-induced vibration control are also discussed. The transmission tower＇s wind-induced vibration coefficient can be calculated according to the results of timehistory analysis, the comparison of the wind-induced vibration coefficient with that in Code are carried. There is a sudden change in the crossarm position of the transmission tower to the wind-induced vibration coefficient, the present standards are unable to consider it, on which the attention should be paid. The quality, rigidity and the damping of the transmission tower-line system are increased by the transmission lines, resulting in the reduction of the tower vibration response, so the impact of coupling should be considered in wind-tower design. The wind-induced vibration coefficient obtains effective reduction by using the LRDs, and the reduction ratio is gradually increased along the tower.
出处
《水电能源科学》
北大核心
2009年第1期187-191,共5页
Water Resources and Power
基金
国家电网公司科技基金资助项目([2007]413)
关键词
输电塔
风振响应
风荷载调整系数
transmission towers
wind-induced vibration response
wind-induced vibration coefficient
