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Hysteretic energy prediction method for mainshock-aftershock sequences

Earthquake Engineering and Engineering Vibration 2018年第2期17卷 277-291页

作者： Zhai Changhai Ji Duofa Wen Weiping Li Cuihua Lei Weidong Xie Lili Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHeilongjiangHarbin 150090China School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

Structures located in seismically active regions may be subjected to mainshock-aftershock（MSAS）*** study selected two kinds of MSAS sequences,with one aftershock and two aftershocks,*** aftershocksThe MSAS sequence with one aftershock exhibited a 10%to 30%hysteretic energy increase,whereas the MSAS sequence with two aftershocks presented a 20%to 40%hysteretic energy ***,a hysteretic energy prediction equation is proposed as a function of the vibration period,ductility value,and damping ratio to estimate hysteretic energy for mainshockaftershock sequences.

关键词： hysteretic energy mainshock-aftershock sequences SDOF system relative intensity prediction equation

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Normalized residual displacement spectra for post-mains

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 403-421页

作者： Saeed Amiri Alireza Garakaninezhad Edén Bojórquez Structural Engineering Research Center International Institute of Earthquake Engineering and Seismology(IIEES)TehranIran Department of Civil Engineering Faculty of EngineeringUniversity of JiroftJiroftKermanIran Facultad de Ingeniería Universidad Autónoma de SinaloaCalz.de las Américas y Boulevard UniversitariosCd.Universitaria80040 CuliacánMexico

Residual displacement,as a significant measure of structural inelasticity,is effectively used in post-earthquake seismic assessment of *** demand can be considered for seismic evaluation of structures under multiple *** study introduces a simple and novel index to predict the residual displacement of mainshock-damaged structures against subsequent *** proposed index is defined as a ratio between residual displacement of damaged structures against aftershock and peak inelastic displacement of intact structures under *** this study,constantstrength spectra based on the index are developed considering the effects of important structural characteristics and also significant seismic ***,analytical equations are presented to predict the proposed index for bi-linear single-degree-of-freedom(SDOF)systems considering both the effects of positive and negative polarities of ***,an equation is suggested to estimate the peak inelastic displacement of intact systems under mainshock,which is required to compute the index.

关键词： residual displacement demand mainshock-aftershock sequences peak inelastic displacement constantstrength spectra

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