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Title:: A Method for Non-stationary Ground Motion Simulation Based on the Equivalent Group Velocity Model

作者:: 马完君¹; 卢建旗¹; 唐丽华²; 谢志南¹; (1.中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨 150080; 2.新疆维吾尔自治区地震局,新疆维吾尔自治区乌鲁木齐 830011)

Author(s):: MA Wanjun¹; LU Jianqi¹; TANG Lihua²; XIE Zhinan¹; (1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang, China)(2.Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi,830011,Xinjiang, Chi

Keywords:: non-stationary ground motion; envelope delay; equivalent group velocity; ground motion simulation

摘要:: 基于地震动能量传播速度为群速度这一概念,回顾了相位微分和窄带滤波两种频率相依波包时延计算方法及其在非平稳地震动相位拟合中的应用,归纳给出了一种非平稳地震动生成方法,通过模拟2条典型的海底与陆地地震动验证了方法的有效性,并将该方法应用于区域非平稳地震动场模拟中。结果表明:利用该方法所得模拟地震动记录平均加速度反应谱与原记录加速度反应谱有较高的一致性,而且能很好地再现地震的非平稳特性。

Abstract:: Based on the concept that the energy propagation velocity of ground motion is group velocity,this paper briefly reviews the phase differential and narrow-band filtering methods for calculating frequency-dependent wave packet time delay and their applications in non-stationary ground motion phase simulation.Then a non-stationary ground motion simulation method is established.The effectiveness of this method is verified by simulating two typical ocean-bottom and land ground motions.Finally,the application of this method in regional non-stationary ground motion field simulation is discussed.The results show that the average acceleration response spectrum of the simulated ground motion recorded by this method is consistent with the original recorded acceleration response spectrum.In addition,the non-stationary characteristics of the earthquake can be well reproduced.