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Hybrid Discrete Method for Seismic Response Analysis of Soil-Structure System with Topographical Site Consideration

考虑地形场地的土-结构系统地震响应分析的混合离散方法

基本信息

批准号：
63550340
负责人：
TAKEMIYA Hirokazu
金额：
$ 1.41万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

This paper concerns the surface soil response during earthquake motion with particular interest on the topographial condition. In the so-called near field which includes structures, certain distribution exists in soil properties as well as some irregularities in boundary condition. The far field which extends outside the near field is often assumed as a uniform or heterogeneous. The finite element method is taken for the former near field while the boundary element method is used for the latter far field. For the seismic wave incidence, we specify the wave type such as P-, SH-, or SV-wave of plane wave. For the numerical case studies, half-circle, half-ellipse, and trapezoidal alluvium are used with different soil properties. Also, parametric studies are made with changing the wave length of the incident wave and the size of the alluvium. The topographical site effect is clarified in comparison with the results from heterogeneous models.For the soil-structure interaction analysis, interest is placed on deriving the soil impedance function and the effective input motion for certain type foundation. The soil is assumed as axisymmetric layered. The Fourier series expansion is used for describing the response. The parametric studies are performed to discuss the foundation behavior for different incident wave type, angle of its incidence.The effort is made to evaluate the relevant Green functions for the above purposes. The direct stiffness method is applied for evaluating the wave number domain and the numerical inversion is taken to get the inverse Fourier transform for the space domain solution.

本文研究了地表土体在地震作用下的反应，特别是在地形条件下。在包含结构的所谓近场中，土体性质存在一定的分布，边界条件也存在一定的不规则性。在近场之外延伸的远场通常被认为是均匀的或非均匀的。前者的近场采用有限元方法，后者的远场采用边界元方法。对于地震波的入射，我们指定了平面波的P波、SH波或SV波的类型。对于数值算例，采用了不同土性的半圆形、半椭圆形和梯形冲积层。同时，通过改变入射波的波长和冲积层的大小进行了参数研究。在土-结构相互作用分析中，重点推导了土阻抗函数和某一类型地基的有效输入运动。假定土体为轴对称层状结构。响应用傅里叶级数展开来描述。通过参数研究，讨论了不同入射波类型、入射角对地基性状的影响，并对相应的格林函数进行了计算。用直接刚度法计算波数域，用数值反变换得到空间域解的傅里叶逆变换。