风速水平空间相关性对长横担输电塔风效应的影响

楼文娟 段志勇 金晓华 王振华 夏亮

振动与冲击 ›› 2014, Vol. 33 ›› Issue (13) : 63-66.

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (13) : 63-66.
论文

风速水平空间相关性对长横担输电塔风效应的影响

  • 楼文娟1 段志勇1 金晓华2 王振华2 夏亮1
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Influence of turbulent transverse space correlation on wind-induced responses of long cantilever transmission towers

  • LOU Wen-juan1, DUAN Zhi-yong1, JIN Xiao-hua2, WANG Zhen-hua2, XIA Liang1
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摘要

以沿海某220kV长横担角钢输电塔为原型,考虑沿横担向的脉动风速非完全相关性,采用谐波叠加法模拟该输电塔的风速时程,并基于准定常假定进行输电塔风振时域分析,得到了结构的风振响应和杆件内力。研究表明:考虑脉动风速水平向空间相关性后,横担产生显著的转角,塔头具有明显的扭转振动,并导致塔头的斜材内力增幅明显;然而,由于风速空间相关性的引入,顺风向整体脉动风载有所减小,使得全塔的风振系数减小,尤其是塔身的风振系数减幅明显。因此,长横担输电塔设计中应考虑风速水平向空间相关性对风效应的影响。

Abstract

Taking a 220kV long cantilever transmission tower as the research object, this paper simulated the dynamic wind velocity by WAWS considering the effects of turbulent transverse space correlation (TTSC). Based on the quasi-steady assumption, a numerical analysis in time domain was performed to obtain the time history of wind-induced responses of the structure and the elemental stress responses of the tower. The results show that the existence of TTSC induces significant angle, and arouses obvious torsional vibration of the tower. Stresses in diagonal members on the top of the tower also increase significantly due to TTSC. However, as along-wind fluctuating wind load reduces because of TTSC, dynamic response factor of the whole tower, especially the tower body, decreases dramatically. Therefore, the influence of TTSC on wind-induced responses should be taken into consideration in the design of transmission tower.

关键词

脉动风速空间相关性 / 风振响应 / 风振系数 / 扭转风振

Key words

turbulent transverse space correlation / wind-induced responses / dynamic response factor / torsional vibration

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楼文娟 段志勇 金晓华 王振华 夏亮. 风速水平空间相关性对长横担输电塔风效应的影响[J]. 振动与冲击, 2014, 33(13): 63-66
LOU Wen-juan;DUAN Zhi-yong;JIN Xiao-hua;WANG Zhen-hua;XIA Liang. Influence of turbulent transverse space correlation on wind-induced responses of long cantilever transmission towers[J]. Journal of Vibration and Shock, 2014, 33(13): 63-66

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