Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios

Past studies have shown that aftershocks can increase structural damage, especially for structures damaged in the mainshock and experienced nonlinear behavior. This damage is generally the result of increased lateral displacement of the structure and thus, it is necessary to estimate the lateral dis...

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Autores principales:	Vahid Vahedian, Gholamreza Abdollahzadeh, Hamed Hamidi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	inelastic displacement ratio mainshock-aftershock seismic sequences sdof systems nonlinear dynamic analysis Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/658f2572a0dc4c5d8f89ba29957ce22c
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id	oai:doaj.org-article:658f2572a0dc4c5d8f89ba29957ce22c
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spelling	oai:doaj.org-article:658f2572a0dc4c5d8f89ba29957ce22c2021-11-08T15:54:55ZEffect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios2476-39772538-261610.22065/jsce.2019.200979.1944https://doaj.org/article/658f2572a0dc4c5d8f89ba29957ce22c2021-07-01T00:00:00Zhttps://www.jsce.ir/article_99202_7fab970390c2b4709b0ebb08b4acd0d0.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Past studies have shown that aftershocks can increase structural damage, especially for structures damaged in the mainshock and experienced nonlinear behavior. This damage is generally the result of increased lateral displacement of the structure and thus, it is necessary to estimate the lateral displacement of the structure under seismic evaluation accurately. Although the target displacement in the nonlinear static analysis method is calculated by means of relationships presented in performance-based design codes, the effect of the aftershock is not taken into account. In this study, the impact of aftershock on inelastic displacement ratio is considered as the most effective factor in determining the target displacement. The results showed that this ratio increases significantly due to aftershocks. The dispersion of the results led to the investigation of the hazard levels of the input earthquakes and subsequently using the scaling method of the accelerograms. For this purpose, a target aftershock spectrum was generated by a statistical study on the maximum acceleration ratio of the mainshock and its corresponding aftershocks, thereby the aftershocks scale to an independent target acceleration spectrum. Comparison of the responses from scaling revealed that dispersion in results are an inherent issue and cannot be resolved. Finally, by modifying in the current relationship of the code, a new formula has been proposed for the inelastic displacement ratio such that the mean error values were reduced as much as possible.Vahid VahedianGholamreza AbdollahzadehHamed HamidiIranian Society of Structrual Engineering (ISSE)articleinelastic displacement ratiomainshock-aftershockseismic sequencessdof systemsnonlinear dynamic analysisBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 5, Pp 279-295 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	inelastic displacement ratio mainshock-aftershock seismic sequences sdof systems nonlinear dynamic analysis Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	inelastic displacement ratio mainshock-aftershock seismic sequences sdof systems nonlinear dynamic analysis Bridge engineering TG1-470 Building construction TH1-9745 Vahid Vahedian Gholamreza Abdollahzadeh Hamed Hamidi Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
description	Past studies have shown that aftershocks can increase structural damage, especially for structures damaged in the mainshock and experienced nonlinear behavior. This damage is generally the result of increased lateral displacement of the structure and thus, it is necessary to estimate the lateral displacement of the structure under seismic evaluation accurately. Although the target displacement in the nonlinear static analysis method is calculated by means of relationships presented in performance-based design codes, the effect of the aftershock is not taken into account. In this study, the impact of aftershock on inelastic displacement ratio is considered as the most effective factor in determining the target displacement. The results showed that this ratio increases significantly due to aftershocks. The dispersion of the results led to the investigation of the hazard levels of the input earthquakes and subsequently using the scaling method of the accelerograms. For this purpose, a target aftershock spectrum was generated by a statistical study on the maximum acceleration ratio of the mainshock and its corresponding aftershocks, thereby the aftershocks scale to an independent target acceleration spectrum. Comparison of the responses from scaling revealed that dispersion in results are an inherent issue and cannot be resolved. Finally, by modifying in the current relationship of the code, a new formula has been proposed for the inelastic displacement ratio such that the mean error values were reduced as much as possible.
format	article
author	Vahid Vahedian Gholamreza Abdollahzadeh Hamed Hamidi
author_facet	Vahid Vahedian Gholamreza Abdollahzadeh Hamed Hamidi
author_sort	Vahid Vahedian
title	Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
title_short	Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
title_full	Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
title_fullStr	Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
title_full_unstemmed	Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios
title_sort	effect of mainshock-aftershock sequences on the inelastic displacement ratios
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/658f2572a0dc4c5d8f89ba29957ce22c
work_keys_str_mv	AT vahidvahedian effectofmainshockaftershocksequencesontheinelasticdisplacementratios AT gholamrezaabdollahzadeh effectofmainshockaftershocksequencesontheinelasticdisplacementratios AT hamedhamidi effectofmainshockaftershocksequencesontheinelasticdisplacementratios
_version_	1718441569777876992

Effect of Mainshock-Aftershock Sequences on the Inelastic Displacement Ratios

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