| 北京市防震减灾中心结构地震反应观测及振动特性识别 |
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| 引用本文： | 王飞,刘英华,任志林,田宇明.北京市防震减灾中心结构地震反应观测及振动特性识别[J].震灾防御技术,2015,10(3):539-546. |
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| 作者姓名： | 王飞 刘英华 任志林 田宇明 |
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| 作者单位： | 中国地震局地球物理研究所,北京 100081 ; 北京市地震局,北京 100080;北京市地震局,北京 100080;北京市地震局,北京 100080;北京优赛科技有限公司,北京 100043 |
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| 基金项目： | 中国地震局青年科技骨干人才项目（201204190030） |
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| 摘 要： | 以北京市防震减灾中心结构为例,进行了结构的地震反应观测及振动特性识别研究。基于半功率带宽法对结构脉动测试数据进行了分析,计算出了结构自振周期和振型以及相应的阻尼比。各振型都具有较大幅值的楼层分别位于3、6和8层,据此设计并建成了结构地震反应观测台阵。分析台阵地震记录识别出了结构的自振特性,同时功率谱曲线显示,井下数据存在高频特性,初步判定其来自钢套管振动。开展结构的数值模拟分析,利用观测楼层上地震记录的卓越频率不断修正结构数值模型,直至结构反应与地震记录的频率值相符,且与脉动测试数据基本一致,相对位移对比分析发现,在该模型基础上相对位移反应与相对位移记录基本吻合。结构地震反应观测和数值模拟分析较好地实现了结构地震反应观测台阵的观测目的。
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| 关 键 词： | 脉动测试 地震反应观测 卓越频率 相对位移 |
| 收稿时间： | 6/4/2014 12:00:00 AM |
Structural Seismic Vibration Observation and Identification for the Building of Disaster Reduction Center in Beijing |
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| Wang Fei,Liu Yinghu,Ren Zhilin and Tian Yuming.Structural Seismic Vibration Observation and Identification for the Building of Disaster Reduction Center in Beijing[J].Technology for Earthquake Disaster Prevention,2015,10(3):539-546. |
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| Authors: | Wang Fei Liu Yinghu Ren Zhilin and Tian Yuming |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China ; Earthquake Administration of Beijing Municipality, Beijing 100080, China;Earthquake Administration of Beijing Municipality, Beijing 100080, China;Institute of Geophysics, China Earthquake Administration, Beijing 100081, China ; Earthquake Administration of Beijing Municipality, Beijing 100080, China;Beijing Eusci Technology Co. Ltd., Beijing 100043, China |
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| Abstract: | The building of Disaster Reduction Center in Beijing is selected as an example for vibration observation and characteristics identification. Natural structural periods with their modes and damping ratio were calculated from ambient testing data in the building. Vibration modes suggest the amplitudes are distinct on the 3rd, 6th and 8th floors, based on the seismic observation array which was built in the building. Structural vibration characteristics are identified with the earthquake recordings in the array. High frequency component are notable in power spectrum of the borehole signal and analysis attributes it to the rigid vibration of the steel sleeve. Numerical simulation analysis that indicates the structural predominant frequency has a good match with measurements in combination with the ambient frequency. The relative displacements are likewise identical to the measurements on the observed floors. Structural vibration observation and numerical simulation analysis enable to the better observation significance for the structural seismic response observation array. |
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| Keywords: | Ambient testing Seismic response observation Predominant frequency Relative displacements |
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