Identification of acceleration pulses in near-fault ground motion using the EMD method

作     者：张郁山 胡聿贤 赵凤新 梁建文 杨彩红 

作者机构：Department of Civil EngineeringTianjin UniversityTianjin 300072China Ph.D.student Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China Professor Department of Civil EngineeringTianjin UniversityTianjin 300072China Professor Department of Civil EngineeringTianjin UniversityTianjin 300072China GraduateStudent 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2005年第4卷第2期

页      面：201-212页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0813[工学-建筑学] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Natural Science Foundation of China Under Grant No. 50278090 

主　　题：acceleration pulse velocity pulse near-fault pulse-like ground motion empirical mode decomposition(EMD) response spectrum 

摘      要：In this paper, response spectral characteristics of one-, two-, and three-lobe sinusoidal acceleration pulses are investigated, and some of their basic properties are derived. Furthermore, the empirical mode decomposition （EMD） method is utilized as an adaptive filter to decompose the near-fault pulse-like ground motions, which were recorded during the September 20, 1999, Chi-Chi earthquake. These ground motions contain distinct velocity pulses, and were decomposed into high-frequency （HF） and low-frequency （LF） components, from which the corresponding HF acceleration pulse （if existing） and LF acceleration pulse could be easily identified and detected. Finally, the identified acceleration pulses are modeled by simplified sinusoidal approximations, whose dynamic behaviors are compared to those of the original acceleration pulses as well as to those of the original HF and LF acceleration components in the context of elastic response spectra. It was demonstrated that it is just the acceleration pulses contained in the near-fault pulse-like ground motion that fundamentally dominate the special impulsive dynamic behaviors of such motion in an engineering sense. The motion thus has a greater potential to cause severe damage than the far-field ground motions, i.e. they impose high base shear demands on engineering structures as well as placing very high deformation demands on long-period structures.