变电站高耸避雷针顺风向风振响应分析  

Along-Wind Responses of High-Rise Lightning Rod in Substations

作　　者：董新胜 张军锋[2] 杨洋 管品武[2] DONG Xinsheng;ZHANG Junfeng;YANG Yang;GUAN Pinwu(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Xinjiang Electric Power Research Institute,Urumqi 830011,China)

机构地区：[1]国网新疆电力公司电力科学研究院,乌鲁木齐830011 [2]郑州大学土木工程学院,郑州450001

出　　处：《结构工程师》2020年第2期144-148,共5页Structural Engineers

基　　金：国家自然科学基金项目(51508523)资助。

摘　　要：为明确高耸避雷针结构顺风向的风振效应及影响因素,以典型独柱避雷针为例,在结构表面脉动风场模拟的基础上进行风振响应时程计算,并采用频域方法对计算结果进行了校核。根据时域计算结果,分析了位移、弯矩和剪力阵风响应因子G和风振系数β的差异,并探讨了结构阻尼、场地类型以及风速的影响。研究发现,独柱避雷针结构基频较小,共振效应显著,并以一阶共振为绝对主力;各响应的G值及沿高度的分布有较大差异,位移的G值偏小而弯矩和剪力的G值偏大;由于结构设计以内力尤其是弯矩控制,因此应以弯矩响应确定β取值;结构阻尼和场地类型对风振效应的影响较大而风速的影响较小,但大部分工况下β取值均大于现行规范取值2.0,说明现行规范取值偏于不安全,在今后的修订中应对β取值考虑多因素的影响。The study was initated for the wind-induced along-wind responses of high-rise lightning rod insubstations and the in fluence factors.A representive high-rise lightning rod was selected and wind-induced dynamic calculations in time domain were conducted following the fluctuating wind field simulation.Dynamic analyses in frequency domain were also performed for validation.The wind-induced dynamic effects in terms of displacement,moment and shear force were studied in the form of gust response factor G and load amplification factorβ.Further discussions were also presented on the influence factors such as damping ratio,tarrain type and basic velocity.It was found that the resonant component is prominent due to the low frequency which is dominated by the fist mode.The values and distributions along the height of gust response factor of different responses show great difference.The gust response factor of displacement is lower than the internal forces.Then,the load amplification factor should be deduced from the moment rather than the displacement because the structural design focuses more on the internal force but not the displacement.The variations of structural damping ratio and terrain type exhibit more influence on the wind-induced responses than that of velocity.However,in most conditions,the deduced load amplification factor is greater than the code value 2.0,which means the regulations couldn’t cover the real dynamic effects and should be revised accordingly.

关 键 词：避雷针 阵风响应因子 风振系数 结构阻尼 场地类型 基本风速 

分 类 号：TU311.3[建筑科学—结构工程]