特高压直流输电塔风振响应参与模态分析  

Participant Mode Analysis of Wind-induced Responses of HVDC Power Transmission Tower

作　　者：段松涛[1] 吴海洋[2] 包永忠[2] 舒爱强[2] 

机构地区：[1]电力规划设计总院,北京100120 [2]中南电力设计院,湖北武汉430071

出　　处：《土木工程与管理学报》2013年第3期29-32,共4页Journal of Civil Engineering and Management

摘　　要：为了使工程设计人员更加深刻理解风振系数,同时在输电塔设计时更加简便的考虑风荷载,本文详细介绍了基于准稳定理论计算输电塔风振响应的方法,并以某±800 kV特高压直流输电塔为例,分析了其风振响应与参与计算模态的关系。结果表明,随着特高压输电塔横担长度的逐渐增加,风振计算时扭转模态不容忽略;现行规范风振系数计算公式仅适用于侧向振动的情况,考虑扭转振型后的风振系数计算非常困难,建议采用荷载效应组合,使输电塔风荷载工况下的构件计算更加科学、简便和直接。In order to understand wind-induced vibration coefficient better by designers, and consider wind loads more simply when designing power transmission tower, a method to calculate the wind-induced responses of power transmission tower based on quasi-steady theory is introduced. Take a ＋ 800 kV HVDC transmission tower for example, the relationship between its wind-induced responses and participant modes is analyzed. The results showed that, with the length of high-voltage transmission tower cross arm increasing, the contribution to wind-induced responses of torsion mode can not be ignored. Only lateral vibration is considered in popular design codes. To calculate the wind-induced vibration coefficient of power transmission tower becomes very difficult when the torsion mode taken into account. The load effect combination is recommended to be adopted, so that the calculation of members under wind load could be more scientific , simple and direct.

关 键 词：特高压直流输电塔 风振响应 参与模态 荷载效应组合 

分 类 号：TU311.3[建筑科学—结构工程]