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Fundamental Study on Improved Ground Motion Models for Aseismic Deign

抗震设计改进地震动模型的基础研究

基本信息

批准号：
07650549
负责人：
HARADA Takanori
金额：
$ 0.83万
依托单位：
Miyazaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650549/
关键词：
Ground motion Earthquake source model Green's function Boundary Element Method Stochastic source model Aseismic design Irregular ground Kinematic source model 震源モデル

项目摘要

(1) In order to use a seismological model in engineering simulation of ground motions, analytical solutions of seismic waves radiated from a kinematic earthquake source model are derived in the frequency wave number domain. They make it possible to simulate the ground motions in faster and numerically stable way. To demonstrate the applicability of the solutions into engineering simulation of ground motions, 1996 Parkfield earthquake accelerograms are simulated using the solutions in the frequency range of 0-1.25 Hz in conjunction with the stochastic ground motion model with the omega squared property in source spectrum in the higher frequency of 1.25-10 Hz.(2) The previous formulations for the empirical Green's function method are summarized, and the general formulation is proposed where a single parameter is used to represent the inhomogeneous fault property. By introducing the randomness of time delay of small fault ruputures into this generalized formulation, the average spectrum amplitude of ground motion is derived. The derived source spectrum is found to have the three corner frequencies consistent with the previous inhomogeneous fault models.(3) The direct boundary element method (DBEM) is developed for the analysis of seismic response of a layrd ground with irregular topography due to incident plane SH waves. The formulation of the DBEM in this study is based on the Green's function of a viscoelastic medium occupying the full space. This formulation makes it possible to easily analyze the seismic response of a ground with all kind of irregular topographies.

(1)为了将地震学模型应用于工程地震动模拟，在频率波数域中导出了运动震源模型辐射地震波的解析解。它们使以更快和数值稳定的方式模拟地面运动成为可能。为了证明解在地面运动工程模拟中的适用性，使用0-1.25 Hz频率范围内的解与1.25-10 Hz较高频率的源谱具有ω平方特性的随机地面运动模型相结合，模拟了1996年帕克菲尔德地震加速度。(2)总结了以往经验格林函数法的表达式，提出了用单一参数表示非齐次故障性质的一般表达式。在广义公式中引入小断层破裂时滞的随机性，导出了地震动平均谱幅值。导出的源谱的三个角频率与以前的非均匀故障模型一致。(3)提出了直接边界元法（DBEM），用于分析平面SH波入射下不规则地表的地震反应。本研究的DBEM的公式是基于粘弹性介质占满空间的格林函数。该公式可以方便地分析具有各种不规则地形的地基的地震反应。