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）为了在地面运动的工程模拟中使用地震学模型，在频率波数域中得出了从运动地震源模型辐射的地震波的分析解。它们使以更快和数字稳定的方式模拟地面运动成为可能。为了证明解决方案在地面运动的工程模拟中的适用性，1996年Parkfield地震加速图是使用0-1.25 Hz频率范围的溶液与随机地面运动模型一起模拟的，与Omega的随机地面运动模型一起模拟。较高的频率为1.25-10 Hz。（2）总结了经验绿色功能方法的先前制剂，并提出了一般公式，其中使用单个参数来表示不均匀的断层属性。通过将小断层汇合度的时间延迟的随机性引入到这种广义的公式中，得出了平均地面运动的光谱幅度。发现派生的源光谱具有三个角频率与先前的不均匀断层模型一致。（3）开发了直接边界元素方法（DBEM），用于分析具有不规则地形的外行地面的地震响应波浪。这项研究中DBEM的配方基于占据整个空间的粘弹性介质的绿色功能。这种表述使得可以轻松地通过各种不规则的地形分析地面的地震反应。