基于RDT和WT方法识别超高层建筑的模态参数

申建红;;李春祥;李锦华

振动与冲击 ›› 2009, Vol. 28 ›› Issue (6) : 66-70.

PDF(1200 KB)
PDF(1200 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (6) : 66-70.
论文

基于RDT和WT方法识别超高层建筑的模态参数

  • 申建红1, 2, 李春祥1, 李锦华1
作者信息 +

Identifying modal parameters of super tall buildings based on RDT and WT methods

  • Shen Jianhong 1, 2, Li Chunxiang 1, Li jinhua 1
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文章历史 +

摘要

摘要:超高层建筑风致振动相关的动态参数尤其是阻尼比数据资料的缺乏会增加设计阶段动态参数准确选取的难度。因而,现役超高层建筑动态响应的实测与参数识别对这些动态数据资料的补充和设计准确性的校验是十分必要的。本文将基于强风作用下超高层建筑—上海金茂大厦动态响应的现场实测,使用Morlet小波变换并且结合随机减量技术(RDT)识别上海金茂大厦的固有频率和阻尼比。数值结果表明,上海金茂大厦固有频率的识别非常精确,但发现阻尼比的识别随着阶数的升高其标准差有增大的趋势。

Abstract

Abstract:Difficulties of selecting the accurate dynamic parameters will be increased in stages of building design for lack of the dynamic parameter data, especially damping ratios related to wind-induced responses of super tall buildings. Field measurements of dynamic responses of super tall buildings and subsequent modal parameter identification thus may increase and supplement these data and evaluate the design accuracy. In this paper, the strong wind-induced responses of Shanghai Jin Mao mansion via field measurements are analyzed by the wavelet transformation (WT) with a kernel function, namely the Morlet wavelet, combined with the random decrement technique (RDT), then identifying its natural frequencies and corresponding damping ratios. The numerical result shows that the identification of structural natural frequencies is considerably accurate and while with the increasing of order, the standard deviation of damping ratios is going up.

关键词

随机减量技术(RDT) / 小波变换(WT) / 超过高层建筑 / 模态参数识别 / 风致振动

Key words

Random decrement technique (RDT) / Wavelet transformation (WT) / Super tall buildings / Modal parameter identification / Wind-induced vibrations

引用本文

导出引用
申建红;;李春祥;李锦华. 基于RDT和WT方法识别超高层建筑的模态参数[J]. 振动与冲击, 2009, 28(6): 66-70
Shen Jianhong;;Li Chunxiang;Li jinhua . Identifying modal parameters of super tall buildings based on RDT and WT methods[J]. Journal of Vibration and Shock, 2009, 28(6): 66-70

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