强地震动场相位谱的一种工程预测方法
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摘要
本文在强震地震波频散研究的基础上，进行了强地震动场相位预测方法和多点地面运动时程合成方法的研究。作者首先运用ＳＭＡＲＴ—１台阵资料对强地震波等效频散模型进行了深入研究，发现表示地震动相位随机性的随机过程η（ｆ）的相位服从正态分布，并用此分布取代了原模型中的均匀分布的假定。然后将这一改进的等效频散模型推广应用于强地震动场相位的预测。论文中提出的方法既考虑了相邻点相位的行波相关性，亦考虑了多种复杂因素产生的随机性．最后，利用ＳＭＡＲＴ—１台阵记录，通过合成的地震动场的时程曲线、绝对加速度反应谱和强度包线与相应观测结果的对比，对建议的方法进行了检验，论证了这一方法的可行性，并对今后研究工作作了简要讨论。
A method for predicting the phase spectra of strong ground motion is presented based on the equivalent dispersion of wave motion and the approach for synthesizing ground motions is then studied. It is found by studying the model of equivalent dispersion using SMART-1 array records that the phase of the stochastic process η(f),which characterizes the randonmess of the fourier phase of strong ground motion, obeys the normal distribution in the range [0,2π]. The discovery is then used to improve equivalent dispersion model. The improved model is further extended to predict the phase spectra of strong ground motions within a field. Both the deterministic phase relation of adjacent points caused by the traveling wave and the randonmess caused by a number of complex factors are considered in this model. The method is checked by comparing synthesized and observed accelerograms, absolute acceleration spectra and intensity envelopes of ground motion using the SMART-1 array data.
A method for predicting the phase spectra of strong ground motion is presented based on the equivalent dispersion of wave motion and the approach for synthesizing ground motions is then studied. It is found by studying the model of equivalent dispersion using SMART-1 array records that the phase of the stochastic process η(f),which characterizes the randonmess of the fourier phase of strong ground motion, obeys the normal distribution in the range [0,2π]. The discovery is then used to improve equivalent dispersion model. The improved model is further extended to predict the phase spectra of strong ground motions within a field. Both the deterministic phase relation of adjacent points caused by the traveling wave and the randonmess caused by a number of complex factors are considered in this model. The method is checked by comparing synthesized and observed accelerograms, absolute acceleration spectra and intensity envelopes of ground motion using the SMART-1 array data.
引文
1王前信等．拱式结构对地震多支点输入的反应．地震工程与工程振动，4卷2期，19842王前信等，地震多点输入或扰力多点输入时框架结构的反应．地震工程与工程振动，3卷2期，19833项海帆．斜张桥在行波作用下的地震反应分析．同济大学学报，1983年第2期4C．H．Loh，AnalysisofSpetialVariationofSeisndcWaveandGroundMovementsfromSMART－1ArrayData，EESD，Vol．13，PP．561—581，19855R．S．HarichandranandE．H．Vanmarcke．StochasticVariationofEarthquakeGroundMotioninSpaceandTime，ASCE，J．E．M，Vol．112，No．2，19866C．H．LohandS．G．Lin，DirectionalityandSimulationinSpatialVariationofSeismicWaves，EngineerStructural，Vol．12，19907H．Hao，C．S．OliveivaandJ．Penzien，Multiple－StationGroundMotionProcessingandSimulationBasedonSMART—1array，NuclearEngineeringandDesignVol．111，No．3，Feb．Ⅱ，19898金星．重大工程场地设计地震动与地震动场的研究．国家地震局工程力学研究所博士论文，19929胡世德，范文础．江阴长江公路大桥纵向地震反应分析．同济大学学报，Vol．22，No．4，199410范立础，袁万城，胡世德．南浦大桥非线性地震反应分析．土木工程学报，1992，25（3）11廖振鹏，魏颖．设计地震加速度的合成．地震小区划－理论与实践．廖振鹏主编．地震出版社，198912廖振鹏，金星．强地震动相位的一个随机模型．地震学报，199513金星，廖振鹏．地震动强度包线函数的理论研究．地震学报，Vol．16．No．4，199414丁海平．地震动场的一种工程预测方法－相位谱的工程预测．国家地震局工程力学研究所硕士论文．1995
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