• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2013, Vol. 34 ›› Issue (11): 22-26.doi: 10.3969/j.issn.1000-7229.2013.11.005

• 规划设计 • 上一篇    下一篇

新旧荷载规范对输电塔风振的影响

范玉娟,邓洪洲   

  1. 同济大学建筑工程系,上海市 200092
  • 出版日期:2013-11-01
  • 作者简介:范玉娟 (1988),女,硕士研究生,研究方向为特高压钢管输电塔风振疲劳,E-mail:fanyujuan1988929@sina.com; 邓洪洲 (1960),男,工学博士,教授,研究方向为输电塔优化设计。

Influences of Wind Vibration on Power Transmission Towers in New and Old Load Codes

FAN Yujuan, DENG Hongzhou   

  1. Department of Building Engineering, Tongji University, Shanghai 200092, China
  • Online:2013-11-01

摘要:

为分析新荷载规范关于风荷载方面的修订对输电塔结构风振的影响,采用线性滤波法并考虑空间相关性对某一特高压输电塔的风速时程进行数值模拟。采用有限元法分析输电塔的动力特性,对比了由于新荷载规范湍流度的提高对输电塔结构位移响应和加速度响应的影响。根据模拟结果按定义式计算结构的风振系数,并同新旧荷载规范中的风振系数计算表达式计算的结果进行对比。结果表明,由于新荷载规范对10 m高度名义湍流度和峰值因子有较大提高,而钢结构的阻尼比不变,在新规范规定下结构的风振响应增大20%左右,而风振系数在各高度处均有不同程度的提高。

关键词: 输电塔, 风振系数, 荷载规范, 风荷载

Abstract:

In order to analyze the influences of new edition of Chinese load code on wind-induced vibration of transmission towers, wind velocity time history on a ultra-high voltage (UHV) transmission tower was simulated by linear filtering method, considering the spatial correlation. Based on the analyses of dynamic property of the structure with using finite element method, influences of turbulence intensity on the displacement response and acceleration response of transmission tower structure were compared in new and old load codes. Wind-induced vibration coefficients were calculated according to simulated results, and they were compared with those coefficients calculated in new and old load codes. The results have shown that the wind-induced vibration has an increase by 20% and has different degrees of improvement at different heights, due to the increase of turbulence intensity and peak factor for 10-m height in new load code, while steel damping ratio being unchanged.

Key words: transmission tower, wind-induced vibration coefficient, load code, wind load