场地土动力特性识别方法对比
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摘要
结合自由场地土振动台试验,对比了随机子空间迭代(SSI)方法、经验模式分解结合希尔伯特变换(EMD+HT)方法和频域分解(FDD)方法识别场地土卓越频率、阻尼比的适用性,以及不同激励类型、不同土层深度和大阻尼比情况对识别精度的影响。结果表明:对于随机激励,当阻尼比较小时,上述3种方法均能准确识别出场地土卓越频率;而大震时土体卓越频率、阻尼比与振动过程耦合,此时经验模式分解结合希尔伯特变换方法可以给出合理的识别结果。
Combining free soil shaking table test,the predominant frequency of silty clay and its damping ratio used in series of shaking table test were identified by three commonly used methods,i.e.the stochastic subspace identification(SSI) method,frequency domain decomposition(FDD) method and empirical mode decomposition plus Hilbert transform(EMD+HT) method.The applicabilities of the three methods were verified and identification results were discussed in items of effect of input type,different soil depths and selection of calculating parameters concerning large damping ratio cases.The results show that the three methods are applicable for random excitation and small damping ratio cases;only empirical mode decomposition plus Hilbert transform method can produce reasonable results when soil predominant frequency and damping ratios are coupled with vibration process or subjected to strong earthquake.
Combining free soil shaking table test,the predominant frequency of silty clay and its damping ratio used in series of shaking table test were identified by three commonly used methods,i.e.the stochastic subspace identification(SSI) method,frequency domain decomposition(FDD) method and empirical mode decomposition plus Hilbert transform(EMD+HT) method.The applicabilities of the three methods were verified and identification results were discussed in items of effect of input type,different soil depths and selection of calculating parameters concerning large damping ratio cases.The results show that the three methods are applicable for random excitation and small damping ratio cases;only empirical mode decomposition plus Hilbert transform method can produce reasonable results when soil predominant frequency and damping ratios are coupled with vibration process or subjected to strong earthquake.
引文
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[3]PITILAKIS K D,ANSTASSIADIS A,ROPTAKISD.Field and Laboratory Determination of DynamicProperties of Natural Soil Deposits[C]//ALBERTOB.Proceedings of 10th World Conference on Earth-quake Engineering.Madrid:Taylor&Francis,1992:1275-1280.
[4]ELGAMAL A W,ZEGHAL M,PARRA E,et al.Identification and Modeling of Earthquake GroundResponse-I:Site Amplification[J].Soil Dynamics andEarthquake Engineering,1996,15(8):499-522.
[5]GLASER S D,BAISE L G.System Identification Es-timation of Soil Properties at the Lotung Site[J].SoilDynamics and Earthquake Engineering,2000,19(7):521-531.
[6]MIKAMI A,SAWADA T.Simultaneous Identifica-tion of Time and Space Variant Dynamic Soil Prop-erties During the 1995 Hyogoken-Nanbu Earthquake[J].Soil Dynamics and Earthquake Engineering,2005,25(1):69-77.
[7]OVERSCHEE V P,MOOR D B.Subspace Identifica-tion for Linear Systems:Theory,Implementation,Ap-plications[M].Dordrecht:Kluwer Academic Publish-ers,1996.
[8]BRINKER R,ZHANG L,ANDERSEN P.ModalIdentification of Output-only Systems Using Fre-quency Domain Decomposition[J].Smart MaterStruct,2001,10(3):441-445.
[9]HUANG N E,SHEN Z,LONG S R,et al.The Em-pirical Mode Decomposition and the Hilbert Spectrumfor Nonlinear and Non-stationary Time Series Analy-sis[J].Proceedings of the Royal Society,1998,454(1971):903-995.
[10]YANG J,LEI Y,PAN S,et al.System Identificationof Linear Structures Based on Hilbert-Huang SpectralAnalysis.Part 1:Normal Modes[J].Earthquake Engin-eering and Structural Dynamics,2003,32(10):1533-1554.
[11]CHEN J,XU Y L,ZHANG R C.Modal ParameterIdentification of Tsing Ma Suspension Bridge UnderTyphoon Victor:EMD-HT Method[J].Journal ofWind Engineering and Industrial Aerodynamics,2004,92(10):805-827.
[12]CHEN J,XU Y.Identification of Modal DampingRatios of Structures with Closely Spaced Modal Fre-quencies[J].Structural Engineering and Mechanics,2002,14(4):417-434.
[13]陈隽,徐幼麟.HHT方法在结构模态参数识别中的应用[J].振动工程学报,2003,16(3):383-388.CHEN Jun,XU You-lin.Application of HHT forModal Parameter Identification to Civil Structures[J].Journal of Vibration Engineering,2003,16(3):383-388.
[14]陈国兴.岩土地震工程学[M].北京:科学出版社,2007:141.CHEN Guo-xing.Soil Earthquake Engineering[M].Beijing:Science Press,2007:141.
[15]SHI X,WU H,CHEN J,et al.Design of LaminarShear Box with Openings for Shaking Table Test andExperimental Verification[C]//SHEN Zu-yan,LIJie,WU Zhi-shen,et al.Proceedings of the Interna-tional Symposium on Innovation&Sustainability ofStructures in Civil Engineering.Shanghai:Tongji U-niversity Press,2007:798-806.
[16]廖振鹏.工程波动理论导论[M].2版.北京:科学出版社,2002.LIAO Zhen-peng.Introduction to Wave Motion The-ories in Engineering[M].2nd ed.Beijing:SciencePress,2002.
[17]徐建.建筑振动工程手册[M].北京:中国建筑工业出版社,2002:558.XU Jian.Architecture Vibration Engineering Hand-book[M].Beijing:China Architecture&BuildingPress,2002:558.
[18]曹彩芹,王春玲,王爱勤.指数函数模量成层土上剪切梁的随机地震反应[J].长安大学学报:自然科学版,2008,28(4):66-69.CAO Cai-qin,WANG Chun-ling,WANG Ai-qin.Random Earthquake Response of Shearing Beam onStratified Foundation with Exponential FunctionShear Modulus[J].Journal of Chang an University:Natural Science Edition,2008,28(4):66-69.
[19]曹彩芹,王春玲,黄义.层合圆板与无限层土地基静力相互作用[J].西安科技大学学报,2005,25(3):395-398.CAO Cai-qin,WANG Chun-ling,HUANG Yi.StaticsInteraction Analysis Between Laminated CircularPlate and Infinite Layer Foundation[J].Journal ofXi an University of Science and Technology,2005,25(3):395-398.
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