Innovative method to simulate design earthquake motions by controllingearthquake motion phase and proposal of new performancedesign criterion

通过控制地震运动相位来模拟设计地震运动的创新方法以及新性能设计标准的提出

基本信息

批准号：
19360209
负责人：
SATO Tadanobu
金额：
$ 12.56万
依托单位：
Kobe Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2009
项目状态：
已结题

项目摘要

Both the amplitude and phase characteristics of earthquake motion provide key information needed to evaluate the aseismic capacity of designed structures. In this research we proposed a simple method for modeling the phase characteristic of earthquake motion based on group delay time (the first order derivative of an earthquake motion phase with respect to the circular frequency) and wavelet analysis. Existing data sets of observed earthquake motions and wavelet analysis are used to calculate the group delay time of each earthquake motion. Regression equations for the mean group delay time and standard deviation of group delay time in each frequency band defined in the used wavelet are obtained as functions of the earthquake's magnitude and several source parameters, hypocenter distance as well as local soil conditions. After confirming that the uncertainty of the group delay time could be expressed by the normal distribution, we developed a simulation method of group delay time. To re … More duce complexity of this method we also developed a method to simulate the group delay time based on a first order of the stochastic differential equation. A sample phase spectrum was obtained by integrating a sample group delay time with respect to the circular frequency.Using the sample phase spectrum an earthquake motion compatible with the elastic design response spectrum is then simulated, and its characteristic is investigated using the yield strength demand spectrum. Through this investigation we found that the yield strength demand spectrum was strongly affected by the phase spectrum used for an analysis. If we used a different sample phase spectrum a different yield strength demand spectrum produced even though its elastic response spectrum satisfies the same design elastic response spectrum. To solve this problem we therefore proposed a method to simulate a unique design earthquake motion, which is simultaneously compatible with both the given elastic response spectrum and the yield strength demand spectrum.We also developed a method to simulate realistic earthquake motions using only the information of a phase spectrum taking into account the causality criterion of earthquake motions. Less

地震运动的振幅和相位特征都提供了评估设计结构抗震能力所需的关键信息。在本研究中，我们提出了一种基于群延迟时间（群延迟时间的一阶导数）对地震运动相位特征进行建模的简单方法。地震运动相位相对于圆频率）和小波分析利用现有的地震观测数据集和小波分析来计算每个地震运动的群延迟时间和群标准差的回归方程。定义的每个频段的延迟时间所使用的小波中的是地震震级和几个震源参数、震源距离以及当地土壤条件的函数。在确认群延迟时间的不确定性可以用正态分布表示之后，我们开发了一种模拟方法。为了降低该方法的复杂性，我们还开发了一种基于一阶随机微分方程来模拟群延迟时间的方法，通过对样本群延迟时间进行积分来获得样本相位谱。到圆频率。使用样本然后模拟与弹性设计反应谱相兼容的地震运动，并使用屈服强度需求谱对其特性进行深入研究。通过这项研究，我们发现屈服强度需求谱受到用于分析的相位谱的影响。如果我们使用不同的样本相位谱，即使其弹性响应谱满足相同的设计弹性响应谱，也会产生不同的屈服强度需求谱。为了解决这个问题，我们提出了一种模拟独特设计地震运动的方法，该方法是同时兼容的。具有给定的弹性响应谱和屈服强度需求我们还开发了一种仅使用相位谱信息来模拟真实地震运动的方法，同时考虑了地震运动的因果关系标准。