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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

地震动的幅值和相位特性为评估设计结构的抗震能力提供了关键信息。在这项研究中，我们提出了一个简单的方法来模拟地震运动的相位特性的基础上，群延迟时间（一阶导数的地震运动相位相对于圆频率）和小波分析。利用已有的地震动观测数据和小波分析方法计算了各次地震动的群延迟时间。在所使用的子波中定义的每个频带的平均群延迟时间和群延迟时间的标准差的回归方程作为函数的地震的震级和几个源参数，震源距离以及当地的土壤条件。在确认群延迟时间的不确定性可以用正态分布来表达后，我们开发了群延迟时间的仿真方法。重新 ...更多信息为了减少这种方法的复杂性，我们还提出了一种基于一阶随机微分方程的群时延模拟方法。通过对样本群延迟时间对圆频率的积分得到样本相位谱，利用样本相位谱模拟了与弹性设计反应谱相容的地震动，并利用屈服强度需求谱研究了其特性。通过这项调查，我们发现，屈服强度需求谱的强烈影响的相位谱用于分析。如果采用不同的试件相位谱，即使其弹性反应谱满足相同的设计弹性反应谱，也会产生不同的屈服强度需求谱。为了解决这一问题，我们提出了一种模拟设计地震动的方法，该方法同时与给定的弹性反应谱和屈服强度需求谱相兼容，并发展了一种仅利用相位谱信息并考虑地震动因果关系准则来模拟真实地震动的方法。少