摘要
广州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。
The SHM system of Canton Tower was developed to monitor the structural responses after the completion of its construction under different excitation events（the typhoon,earthquake and normal wind excitation conditions）.The time histories and PSDs of the acceleration responses under different excitation events were acquired and compared.The modal properties（modal frequencies,mode shapes,and damping ratios） of the structure under different excitation events were identified by using the acceleration responses.The HHT technique was applied for obtaining the instantaneous frequencies and energy distribution under different excitation events in time-frequency domain by use of the monitoring data and compared with the results of the wavelet scalogram.The results of the paper supply some references for better understanding the dynamic characteristics of supertall structure under different excitations.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第3期49-54,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(11172333)
广东省科技计划项目(2009B030803038
2010A03200008
2011A030200012)
教育部新教师基金项目(200805581018)
中山大学青年教师培育项目(09lgpy08)
广州新电视塔结构施工监控与运营健康监测服务项目(2007-0379)
关键词
超高结构
动力特性
模态分析
激励
希尔泊特-黄变换
结构健康监测
supertall structure
dynamic characteristics
modal analysis
excitation
Hilbert Huang transformation（HHT）
structural health monitoring（SHM）
