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浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (8): 1520-1525    DOI: 10.3785/j.issn.1008-973X.2009.
    
Wind-induced dynamic response of high-rise transmission tower under downburst wind load
WANG Xin1, LOU Wen-juan1, LI Hong-nan2, CHEN Yong1
1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310027, China;
2. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024， China
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Abstract  

Based on the downburst model considering thunderstorm translation, the time history of downburst horizontal fluctuating wind velocity was generated by using harmony superposition method combined with FFT algorithm to improve the calculation efficiency, and the non-stationary Gaussian fluctuation of moving downburst was expressed by amplitude-modulating a stationary Gaussian process. The wind load coefficients of transmission tower were obtained from wind tunnel test. By quasi-steady assumption and considering the wind azimuth’s continuous change, a horizontal dynamic force model of moving downburst acting on the transmission tower was proposed. The wind-induced response of the transmission tower under downburst was analyzed in detail by using Runge-Kutta method in the time domain. Since the non-stationary characteristics of the downburst, the statistical analysis with large samples was performed to obtain the peak response and dynamic amplification of the transmission tower. Furthermore, the influence of downburst scale on the response of transmission tower was especially discussed. The analysis shows that the downburst scale has an obvious effect on the displacement response of the transmisson tower, but little on the dynamic amplification coefficient. The displacement dynamic amplification coefficient was about 1-4 for 60 m/s maximum velocity of downburst.

Published: 28 September 2009
CLC:  TU 973.213  
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Cite this article:

WANG Cuan, LOU Wen-Juan, LI Hong-Nan, et al. Wind-induced dynamic response of high-rise transmission tower under downburst wind load. J4, 2009, 43(8): 1520-1525.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2009.     OR     http://www.zjujournals.com/eng/Y2009/V43/I8/1520


雷暴冲击风作用下高耸输电塔风振响应

基于考虑雷暴移动的冲击风风场模型,将非稳态高斯过程的冲击风脉动风速表达为稳态高斯过程和调幅函数的乘积,联合运用FFT算法和谐波叠加法模拟了冲击风水平方向脉动风速.通过风洞试验得到输电塔风载体型系数.采用准定常假设,并考虑到风向不断随雷暴的移动而改变,提出了作用于输电塔的雷暴移动冲击风风荷载模型.采用RungeKutta法分析了输电塔在冲击风荷载下的风振响应.针对冲击风过程的非稳态特性,采用多样本统计方法定量分析了输电塔响应动力放大作用,着重探讨了不同尺度的冲击风对输电塔风致响应的变化规律.冲击风尺度变化对输电塔响应影响较大,但对动力放大系数影响不明显.当冲击风的最大风速为60 m/s时,位移动力放大系数为1.4左右.

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