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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地面运动的工程模拟，本文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。它们使得以更快和数值稳定的方式模拟地面运动成为可能。为了证明该解在工程地震动模拟中的适用性，用该解在0 ~ 1.25 Hz频率范围内模拟了1996年Parkfield地震的加速度记录，并结合在1.25 ~ 10 Hz较高频率范围内具有源谱Ω平方特性的随机地震动模型进行了模拟。(2)总结了经验绿色函数法的已有公式，提出了用单一参数表征非均匀断层性质的一般公式。通过引入小断层延迟时间的随机性，得到了地震动平均谱幅值。导出的震源谱具有与以往非均匀断层模型一致的三个角频率。(3)采用直接边界元法（DBEM）分析了平面SH波入射时不规则地形地基的地震反应。在这项研究中的DBEM的制定是基于绿色的功能的粘弹性介质占据整个空间。该公式可以方便地分析各种不规则地形的地震反应。