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A novel time-domain identification technique is developed for the seismic response analysis of soil-structure interaction. A two-degree-of-freedom (2DOF) model with eight lumped parameters is adopted to model the frequency-dependent behavior of soils. For layered soil, the equivalent eight parameters of the 2DOF model arc identified by the extended Kalman filter (EKF) method using recorded seismic data. The polynomial approximations for derivation of state estimators are applied in the EKF procedure. A realistic identification example is given for the layered-soil of a building site in Anchorage, Alaska in the United States. Results of the example demonstrate the feasibility and practicality of the proposed identification technique. The 2DOF soil model and the identification technique can be used for nonlinear response analysis of soil-structure interaction in the time-domain for layered of complex soil conditions. The identified parameters can be stored in a database for use in other similar soil conditions. If a universal database that covers information related to most soil conditions is developed in the future, engineers could conveniently perform time history analyses of soil-structural interaction. 相似文献
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在土-结构的动力相互作用简化分析中,常采用双自由度集中参数模型简化土层.这种模型适合各向同性的单一土层,而实际工程场地的地基土多是各向异性的成层土层.为了将这一模型应用于此类土层,本文根据实际地震动记录,提出了一种变阻尼最小二乘反分析方法,可用来识别模型中的各个参数值.文中提出的方法具有适用范围广、计算精度较高的优点,并已通过编制FORTRAN程序加以实施和应用. 相似文献
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国际测地学与地球物理学联合会(IU-GG)是一个为促进和协调在地球的物理、化学、数学性质及地球的空间环境方面研究的组织。其研究内容包括:地球的形状,地球重力场河地磁场的性质,地球作为一个整体及其组成部分的动力学性质,地球的内部 相似文献
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北京地区农村砖木结构振动台试验研究 总被引:2,自引:0,他引:2
为了了解北京地区典型砖木结构(木柱支撑,木屋盖,外砖墙)农村住宅结构的抗震能力,根据北京地区这类农村住宅结构的调研结果,本文介绍了一座典型砖木结构单层三开间农村住宅2/3缩尺振动台试验结构模型的设计与动力试验结果。按照北京地区8度抗震设防的要求,分别完成了模型在设计小震(0.072g)、中震(0.2g)和大震(0.4g)条件下的振动台动力试验,量测了模型的动力响应,记录了不同激励水平下模型的开裂情况。基于试验结果,分析了这种结构的抗震能力以及该类型房屋的抗震薄弱点,为制定这类结构的抗震加固方案提供依据。 相似文献
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为了解北京地区农村砖砌体结构住宅的抗震能力,本文选取了一种典型的砖木结构房屋作为研究对象,该类房屋以砖垛作为前檐支撑柱,屋架采用木构件,围护结构采用砖墙砌筑.振动台试验模型采用2/3缩尺设计,并按照北京地区8度抗震设防的要求,分别进行了小震(0.072g)、中震(0.2g)和大震(0.4g)条件下的振动台试验.通过分析试验后的结构破坏现象和相关参数,得出了试验模型的抗震性能.基于试验的破坏现象提出了北京地区农村此类建筑相应的抗震加固原则. 相似文献
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Introduction There are various factors affecting the propagation of earthquake waves. Usually these fac- tors include the earthquake source, the path and the site effects. Simulations of the earthquake wave propagation and the strong ground motion are an adequate way to exhibit these factors (Virieux, 1986; Levander, 1988; Frankel and Vidale, 1992; Frankel, 1993; Graves, 1993, 1996a; Olsen et al, 1995; Pitarka et al, 1996; Pitarka, 1999). The most popular numerical method in use is the gri… 相似文献
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