Modeling of soil heterogeneity and its effects on seismic response of multi-support structures

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• 作者：A. Laib ; N. Laouami ; A. Slimani
• 关键词：coherency function ; spatial variability ; soil lateral heterogeneity ; site effect ; multi ; support structures ; response spectrum
• 刊名：Earthquake Engineering and Engineering Vibration
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：14
• 期：3
• 页码：423-437
• 全文大小：1,538 KB
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• 作者单位：A. Laib (1) (2)
  N. Laouami (1)
  A. Slimani (1)
  
  1. National Center of Applied Research in Earthquake Engineering CGS, Algiers, Algeria
  2. Civil Engineering Department, University of Science and Technology Houari Boumediene, Algiers, Algeria
  
• 刊物类别：Engineering
• 刊物主题：Vibration, Dynamical Systems and Control
  Chinese Library of Science
  
• 出版者：Institute of Engineering Mechanics (IEM), China Earthquake Administration
• ISSN：1993-503X

文摘

This paper addresses the analytical evaluation of soil lateral heterogeneity effects, especially the random fluctuations of the soil layer’s predominant frequency, on the spatial coherency of ground motion and the seismic response of multi-support structures. A coherency probabilistic model is proposed. In this model, the spatial variation of motion is attributed to wave passage effects, effects of loss of coherence in the bedrock motion and particularly site response effects (based on the assumption of vertically propagating shear-waves through a horizontal layer with random characteristics). The results indicate that soil lateral heterogeneity effects tend to cause diminution of the values of the total coherency function. This diminution is not limited to the vicinity of the mean resonant frequency of the layer, but reaches considerably high frequencies even for relatively low values of coefficient of variation (CV of 5 to 15%). Therefore, the trend of the total coherency function (exponential decay) can be influenced significantly by site effects. Finally, the proposed coherency model is applied for two different support seismic excitations. Study results indicate that the greater the soil heterogeneity, the larger are the dynamic displacements and shear forces in the columns of the oscillator (i.e., support structure). Furthermore, these two components of the response are influenced differently by soil heterogeneity effects. Keywords coherency function spatial variability soil lateral heterogeneity site effect multi-support structures response spectrum