场地微动各向异性分析及其应用
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摘要
目前 ,场地微动的理论研究和工程应用均基于各向同性介质模型 ,这与实际情况不符。本文首次提出了场地微动各向异性的概念 ,并从弹性波理论出发 ,对各向异性场地微动进行了研究 ,分析了场地微动各向异性的机制 ,得出了一些有益结论。这对于深入研究各向异性场地条件下场地动力特性、预测地震动力特性、结构抗震研究具有非常重要的意义
At present, the theoretical study and the engineering application on ground micro-tremor are based on the hypothesis of isotropy. In fact, the characteristic of the soil is usually anisotropy. The concept of the ground micro-tremor in anisotropy is put forward. The anisotropy mechanism and the method for determining the principal axis of the dynamic properties in anisotropy soil are studied systematically. The study makes up the foundation for the analysis of ground response, and the method considering the fundamental period of the principal axis for the restraint of structural vibration period is put forward.
At present, the theoretical study and the engineering application on ground micro-tremor are based on the hypothesis of isotropy. In fact, the characteristic of the soil is usually anisotropy. The concept of the ground micro-tremor in anisotropy is put forward. The anisotropy mechanism and the method for determining the principal axis of the dynamic properties in anisotropy soil are studied systematically. The study makes up the foundation for the analysis of ground response, and the method considering the fundamental period of the principal axis for the restraint of structural vibration period is put forward.
引文
[1] 谢忠球.各向异性介质中的场地微动理论及其应用研究.中南大学博士学位论文,2002.
[2] KonnoK ,Ohmachi.Ground motioncharacteristicsestimatedfromspectralratiobetweenhorizonalandverticalcomponentsofmicrotremor.Bull.Seismol.Soc.Am1998,88,228～241.
[3] J.Yang.Saturationeffectsonhorizontalandverticalmotioninalayeredsoil bedrocksystemduetoinclinedSVwaves.SoilDynamicsandEarthquakeEngineering,2001,(21):527～536.
[4] MasanobuOdaetal.Microstructuralinterpretationonreliq uefactionofsaturatedgranularsoilundercyclicloading.Jour nalofGeotechnicalandGeoenvironmentalEngineering.2001,416～423.
[5] ChengHsingchen,HwangChiehchiu.AnisotropicseismicgroundresponsesidentifiedfromtheHualianverticalarray.SoilDynamicsandEarthquakeEngineering,1998,(17):371～395.
[6] C .R .Bates,D .R .Phillips.Multi componentseismicsur veyingfornearsurfaceinvestigations:examplesfromcentralWyomingandsouthernEngland.JournalofAppliedGeophys ics,2000,(44):257～273.
[7] 建筑抗震设计规范《GBJ11-89》.北京:中国建筑工业出版社,1989.
[8] 李刚,陈新华,周仁根.地震作用下考虑场地特征周期禁区约束的结构优化设计.工程抗震,1996,(4):17～19,16.
[2] KonnoK ,Ohmachi.Ground motioncharacteristicsestimatedfromspectralratiobetweenhorizonalandverticalcomponentsofmicrotremor.Bull.Seismol.Soc.Am1998,88,228～241.
[3] J.Yang.Saturationeffectsonhorizontalandverticalmotioninalayeredsoil bedrocksystemduetoinclinedSVwaves.SoilDynamicsandEarthquakeEngineering,2001,(21):527～536.
[4] MasanobuOdaetal.Microstructuralinterpretationonreliq uefactionofsaturatedgranularsoilundercyclicloading.Jour nalofGeotechnicalandGeoenvironmentalEngineering.2001,416～423.
[5] ChengHsingchen,HwangChiehchiu.AnisotropicseismicgroundresponsesidentifiedfromtheHualianverticalarray.SoilDynamicsandEarthquakeEngineering,1998,(17):371～395.
[6] C .R .Bates,D .R .Phillips.Multi componentseismicsur veyingfornearsurfaceinvestigations:examplesfromcentralWyomingandsouthernEngland.JournalofAppliedGeophys ics,2000,(44):257～273.
[7] 建筑抗震设计规范《GBJ11-89》.北京:中国建筑工业出版社,1989.
[8] 李刚,陈新华,周仁根.地震作用下考虑场地特征周期禁区约束的结构优化设计.工程抗震,1996,(4):17～19,16.
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