摘要
广州新电视塔结构健康监测系统监测到结构建成后不同激励（包括台风激励，地震激励和一般风荷载激励）下结构的动态响应特性。首先，比较了在不同激励下结构的加速度时程响应和功率谱密度。然后，利用加速度响应数据进行模态分析并比较了在不同激励下结构的模态参数（包括频率、振型和阻尼比）。最后，利用希尔伯特-黄变换获得结构在不同激励下的瞬时频率和结构响应能量分布，并与小波变换的结果相比较。结果可为了解超高层建筑在不同激励下的动力特性提供参考。
Abstract
The SHM system of Guangzhou New TV Tower has monitored the structural responses after having completed its construction under different excitation events (the typhoon, the earthquake and normal wind excitation conditions). Firstly, the time history and PSD of the acceleration response under different excitation events have been compared. Secondly, the modal properties (modal frequencies, mode shapes, and damping ratios) of the structure under different excitation events have been identified and compared using the acceleration responses. At last, the HHT technique is applied for obtaining the instantaneous frequencies and energy distribution under different excitation events in the time-frequency domain by use of the monitoring data and compared with the result of the wavelet scalogram. The results of this paper supply some references for better understanding the dynamic characteristics of supertall under different excitation.
关键词
超高耸结构 /
动力特性 /
模态分析 /
激励 /
希尔波特-黄变换
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Key words
supertall structure /
dynamic characteristics /
modal analysis /
excitation /
HHT
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陈伟欢;吕中荣;陈树辉;倪一清;廖渭扬.
广州新电视塔不同激励下动力特性监测[J]. 振动与冲击, 2012, 31(3): 49-54
CHEH Wei-huan;LU Zhong-rong;CHEN Shu-hui;Ni Yi-qing;LIAO Wei-yang.
Monitoring dynamic characteristics for Guangzhou New TV Tower under different excitation[J]. Journal of Vibration and Shock, 2012, 31(3): 49-54
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