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

地震运动的放大器和相特征都提供了评估设计结构的无压能力所需的关键信息。在这项研究中，我们提出了一种基于群体延迟时间（相对于圆形频率的地震运动的一阶导数）和小波分析来建模地震运动的相特征的简单方法。现有的观察到地震运动和小波分析的数据集用于计算每个地震运动的组延迟时间。在使用小波中定义的每个频带中平均组延迟时间和组延迟时间的标准偏离的回归方程是作为地震幅度的函数以及几个源参数，低分子距离以及局部土壤条件的。在确认组延迟时间的不确定性可以通过正态分布表示后，我们开发了一种组延迟时间的模拟方法。要重新……由于这种方法的复杂性，我们还开发了一种基于随机微分方程的一阶模拟组延迟时间的方法。然后，通过将样品组延迟时间相对于圆频频率而获得样品相光谱。然后，模拟了与弹性设计响应频谱兼容的样品相位频谱，然后使用屈服强度需求谱进行研究，并研究其特征。通过这项调查，我们发现屈服强度需求光谱受到分析的相光谱的强烈影响。如果我们使用了不同的样品相光谱，即使其弹性响应频谱满足相同的设计弹性响应频谱，也会产生不同的屈服强度谱。因此，为了解决这个问题，我们提出了一种模拟独特的设计地震运动的方法，该方法与给定的弹性响应谱和产量强度需求谱均兼容。我们还开发了一种方法来仅使用相位谱的信息来模拟逼真的地质运动，以考虑到地球地震运动的热量标准。较少的