基于谐波合成法的输电塔线体系风致响应分析-电网技术.PDFVIP

第 33 卷 第 18 期 电 网 技 术 Vol. 33 No. 18 2009 年 10 月 Power System Technology Oct. 2009 文章编号：1000-3673 （2009 ）18-0186-05 中图分类号：TM75 文献标志码：A 学科代码：470·4051 基于谐波合成法的输电塔线体系风致响应分析 甘凤林，杨振伟，代晓光 （东北电力大学建筑工程学院，吉林省 吉林市 132012 ） Analysis on Wind-Induced Dynamic Response of Transmission Tower-Line System Based on Weighted Amplitude Wave Superposition GAN Feng-lin，YANG Zhen-wei ，DAI Xiao-guang （School of Civil Engineering，Northeast Dianli University ，Jilin 132012 ，Jilin Province ，China ） ABSTRACT: Due to its features of large cross span, high height 与输电塔之间的风动力耦联作用不容忽略[1-2] 。动力 and flexibility, transmission tower-line system is sensitive to 风致响应分析的正确性和精确度将直接影响到输 wind load and easy to occur visible vibration under wind load. [3] 电塔线结构的安全性 ，由于时域法可以考虑脉动 For this reason, wind load is a very important design load playing 风的时间相关性、空间相关性、结构非线性的影响， a decisive role for such a structure as transmission tower-line 更精确地反映结构的耦合风振[4]，所以输电塔线体 systems and so on. Based on the basic features of fluctuating wind and Davenport wind speed spectrum, in this paper a method 系风致响应分析通常采用时域法。时域内进行风振 to simulate the fluctuating wind field of transmission tower-line 响应分析须以脉动风速时程为基础[5] ，而我国风场 system by weighted amplitude wave superposition (WAWS) 的时程记录资料较少[6]，只有采用数值模拟风速时 method which is improved by decimation-in-time fast Fourier 程才能满足场地、风速谱特性、结构特点等实际工 transform (DIT-FFT) in time domain is proposed. Using the 程的要求，因此采用数值模拟风速时程的方法得到 proposed method, the simulation of an actual example of