高耸结构地震瞬态反应计算与动力特性研究
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摘要
为了研究高耸结构在地震作用下的动力特性,以HHT变换和简谐地震反应理论为基础,采用振型分解法对多自由度体系进行地震瞬态反应计算和分析,获得了长短周期结构的位移响应特征的差异;并提出了多自由体系的长短周期结构的判定标准。最后研究了某一烟囱在地震动作用下的动力特性,研究表明:120m高的烟囱在地震波作用下,在高度约50m以上的部分结构总位移受瞬态振动控制,体现了长周期结构的动力响应特性;在高度约50m以下的部分结构总位移受稳态振动控制,体现了短周期结构的动力响应特性。得出的有益结论为研究高耸结构在抗风振设计、施工荷载和突发性意外横向荷载作用下的结构性能提供一些基础性的资料。
Based on HHT and harmonic earthquake response theory,the dynamic properties of skyscraper structures under seismic motion are studied.Using model superposition method,computation and analyses of earthquake transient response of MDOF systems are conducted.Different characteristics of displacements of long-period structures and short-period structures are obtained,and criteria put forward.The study of the dynamic properties of a high chimney under seismic motion reveals that when a 120-meter-high chimney is subjected to earthquake wave,the displacement of the structure above 50m is controlled by transient vibration,which reflects the long-period characteristics of displacement response,while the displacement of the structure below 50m is controlled by steady vibration,which reflects the short-period characteristics of displacement response.
Based on HHT and harmonic earthquake response theory,the dynamic properties of skyscraper structures under seismic motion are studied.Using model superposition method,computation and analyses of earthquake transient response of MDOF systems are conducted.Different characteristics of displacements of long-period structures and short-period structures are obtained,and criteria put forward.The study of the dynamic properties of a high chimney under seismic motion reveals that when a 120-meter-high chimney is subjected to earthquake wave,the displacement of the structure above 50m is controlled by transient vibration,which reflects the long-period characteristics of displacement response,while the displacement of the structure below 50m is controlled by steady vibration,which reflects the short-period characteristics of displacement response.
引文
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[3]吴琛,周瑞忠.地震瞬态反应计算与结构位移反应谱研究[J].水力发电学报,2007,26(5):53-58(Wu Chen,Zhou Ruizhong.Computation of earthquake transientresponse and research on displacement spectra[J].Journalof Hydroelectric Engineering,2007,26(5):53-58(inChinese))
[4]吴琛.基于小波变换及无单元法的结构动力仿真分析[D].福州:福州大学,2007
[5]吴琛,周瑞忠.Hilbert-Huang变换在提取地震信号动力特性中的应用[J].地震工程与工程振动,2006,26(5):41-46(Wu Chen,Zhou Ruizhong.Application of Hilbert-Huang transform in extracting dynamic properties of seismicsignals[J].Earthquake Engineering and EngineeringVibration,2006,26(5):41-46(in Chinese))
[6]Huang N E,Long S R,Wu M L C,et al.The empiricalmode decomposition and the Hilbert spectrum for nonlinearand non-stationary time series analysis[J].Proceedings ofthe Royal Society,1998,454(1971):903-995
[7]Salajegheh E,Heidari A.Time history dynamic analysis ofstructures using filter banks and wavelet transforms[J].Computers and Structures,2005,83(1):53-68
[8]王肇民.高耸结构振动控制[M].上海:同济大学出版社,1997
[9]赵云飞,张玉梅,宋玉普,等.钢筋混凝土烟囱减震有限元分析[J].工业建筑,2005,35(S):160-163(ZhaoYunfei,Zhang Yumei,Song Yupu,et al.Analysis of seismicresponse of reinforced concrete chimney for reducingvibration by finite element method[J].IndustrialConstruction,2005,35(S):160-163(in Chinese))
[10]胡昌华,李国华,刘涛,等.基于MATLAB6.X的系统分析与设计—小波分析[M].西安:西安电子科技大学出版社,2004
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