地震动瞬时能量谱与结构位移响应关系研究
|
摘要
本文通过HHT变换得到瞬时能量谱,并以HHT对地震动作用下的结构位移响应进行分析,发现长周期结构动力响应的显著特点:最大结构位移响应总是滞后于地震动激励的最大能量谱值时间。滞后的时间主要取决于结构的动力特性参数(特别是自振周期),也与地震动的类型有关。仿真计算的结果表明:长周期结构的破环与倒塌并不发生在地震动强度最大的时刻,而多数是在地震动末期,甚至在地震动完全消失之后。有益的结论为结构控制设计与安全提供科学依据。
Instantaneous energy spectrum is obtained by the HHT transform to analyze structure's displacement responses.Notable characteristics of long-period structure are found: The instant of maximal displacement response of structure is later than the instant of maximal peak value of earthquake energy.Structural dynamic characteristic parameters(especially free vibrafion frequency) and earthquake style play an important role in determining the energy peak value appearing instant.The simulation results also indicate that the destruction or collapse of long period structure does not happen at the appearing instant of the greatest intensity of earthquake ground motion,but frequently at the final stage of earthquake ground motion,or even after the earthquake ground motion completely ends,which can provide scientific basis for the structure design and safety.
Instantaneous energy spectrum is obtained by the HHT transform to analyze structure's displacement responses.Notable characteristics of long-period structure are found: The instant of maximal displacement response of structure is later than the instant of maximal peak value of earthquake energy.Structural dynamic characteristic parameters(especially free vibrafion frequency) and earthquake style play an important role in determining the energy peak value appearing instant.The simulation results also indicate that the destruction or collapse of long period structure does not happen at the appearing instant of the greatest intensity of earthquake ground motion,but frequently at the final stage of earthquake ground motion,or even after the earthquake ground motion completely ends,which can provide scientific basis for the structure design and safety.
引文
[1]刘哲锋,沈蒲生,胡习兵.地震总输入能量与瞬时输入能量谱的研究[J].地震工程与工程振动,2006,14(6):31-36.
[2]胡冗冗,王亚勇.地震动瞬时输入能量谱探讨[J].工程抗震,2004,12(1):9-13.
[3]祁皑,范宏伟,陈永祥.简谐地面运动作用下系统瞬态振动的研究[J].振动、测试与诊断,2003,23(3):199-201.
[4]吴琛,周瑞忠.地震瞬态反应计算与结构位移反应谱研究[J].火力发电学报,2007,26(5):53-58.
[5]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.
[6]周瑞忠,吴琛,江连丁.有限持时地震动对长周期结构动力反应的影响[J].地震工程与工程振动,2008,28(1):146-151.
[7]Huang N E,Shen Z,Long S R,et al.The emp irical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time seriesanalysis[J].Proceedings of the Royal Society of London,1998,A454:903-995.
[8]Huang NE,Wu M,Long S R,et al.Aconfidence limit for the empirical mode decomposition and the Hilbert spectral analysis[J].Proceedingsof the Royal Society of London,2003,A459:2317-2345.
[9]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.
[10]刘强.周瑞忠.Hilbert-Huang变换分析的地震动能量与震动效应评估[J].力学与实践,2008,30(5):19-23.
[11]徐植信,胡再龙.结构地震反应分析[M].北京:高等教育出版社,1993.
[2]胡冗冗,王亚勇.地震动瞬时输入能量谱探讨[J].工程抗震,2004,12(1):9-13.
[3]祁皑,范宏伟,陈永祥.简谐地面运动作用下系统瞬态振动的研究[J].振动、测试与诊断,2003,23(3):199-201.
[4]吴琛,周瑞忠.地震瞬态反应计算与结构位移反应谱研究[J].火力发电学报,2007,26(5):53-58.
[5]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.
[6]周瑞忠,吴琛,江连丁.有限持时地震动对长周期结构动力反应的影响[J].地震工程与工程振动,2008,28(1):146-151.
[7]Huang N E,Shen Z,Long S R,et al.The emp irical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time seriesanalysis[J].Proceedings of the Royal Society of London,1998,A454:903-995.
[8]Huang NE,Wu M,Long S R,et al.Aconfidence limit for the empirical mode decomposition and the Hilbert spectral analysis[J].Proceedingsof the Royal Society of London,2003,A459:2317-2345.
[9]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.
[10]刘强.周瑞忠.Hilbert-Huang变换分析的地震动能量与震动效应评估[J].力学与实践,2008,30(5):19-23.
[11]徐植信,胡再龙.结构地震反应分析[M].北京:高等教育出版社,1993.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心