Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners

Exact seismic evaluation of underground structures such as tunnels requires dynamic analysis, due to the complex dynamic behavior of soil and the interaction of soil and structure. Dynamic analysis in order to simulate the actual seismic response of a structure is possible only with the appropriate...

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Autores principales:	Reza Vahdani, Mohsen Gerami, Gholamreza Ghodrati Amiri, seyed amin razavian amrei
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2020
Materias:	correlations of seismic components near fault field circular tunnel unreinforced concrete liners seismic response Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/4665a38a3a3c43c0a30465729dbaa019
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spelling	oai:doaj.org-article:4665a38a3a3c43c0a30465729dbaa0192021-11-08T15:53:21ZCorrelation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners2476-39772538-261610.22065/jsce.2018.134719.1575https://doaj.org/article/4665a38a3a3c43c0a30465729dbaa0192020-09-01T00:00:00Zhttps://www.jsce.ir/article_73683_0352588429795e2c6871369ff28a61bb.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Exact seismic evaluation of underground structures such as tunnels requires dynamic analysis, due to the complex dynamic behavior of soil and the interaction of soil and structure. Dynamic analysis in order to simulate the actual seismic response of a structure is possible only with the appropriate acceleration time history (compatible with the local site soil conditions). Considering the vertical component of the earthquake on the site is one of the important factors for achieving the real responses of the structure (such as near fault earthquakes). In this paper, using ABAQUS finite element software, the soil and tunnel system was modeled using linear time histories analysis under four near field recordings of the earthquake, taking into account the various proportions of horizontal and vertical components in the twelve loading combinations, and the correlation effect Seismic components have been investigated by combining different loads on acceleration, stress and strain, axial force, bending moment and shear force maximum in tunnel lining. The studies showed that increasing the vertical to horizontal ratio has a very small effect on the maximum horizontal acceleration on the tunnel Liner. By examining the axial forces, bending moment and shear force, increasing the ratio of vertical components to horizontal has the greatest effect on the axial force response. Also, by comparing the maximum stress and strain under the twelve loading combinations for the selected records, the maximum strain in the tunnel liner is less than the allowable strain rate for the concrete and in the case of loading, the stress in the tunnel liner is greater than the permitted stress Concrete and in the opposite direction are confident.Reza VahdaniMohsen GeramiGholamreza Ghodrati Amiriseyed amin razavian amreiIranian Society of Structrual Engineering (ISSE)articlecorrelations of seismic componentsnear fault fieldcircular tunnelunreinforced concrete linersseismic responseBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 7, Iss 3, Pp 165-178 (2020)
institution	DOAJ
collection	DOAJ
language	FA
topic	correlations of seismic components near fault field circular tunnel unreinforced concrete liners seismic response Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	correlations of seismic components near fault field circular tunnel unreinforced concrete liners seismic response Bridge engineering TG1-470 Building construction TH1-9745 Reza Vahdani Mohsen Gerami Gholamreza Ghodrati Amiri seyed amin razavian amrei Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
description	Exact seismic evaluation of underground structures such as tunnels requires dynamic analysis, due to the complex dynamic behavior of soil and the interaction of soil and structure. Dynamic analysis in order to simulate the actual seismic response of a structure is possible only with the appropriate acceleration time history (compatible with the local site soil conditions). Considering the vertical component of the earthquake on the site is one of the important factors for achieving the real responses of the structure (such as near fault earthquakes). In this paper, using ABAQUS finite element software, the soil and tunnel system was modeled using linear time histories analysis under four near field recordings of the earthquake, taking into account the various proportions of horizontal and vertical components in the twelve loading combinations, and the correlation effect Seismic components have been investigated by combining different loads on acceleration, stress and strain, axial force, bending moment and shear force maximum in tunnel lining. The studies showed that increasing the vertical to horizontal ratio has a very small effect on the maximum horizontal acceleration on the tunnel Liner. By examining the axial forces, bending moment and shear force, increasing the ratio of vertical components to horizontal has the greatest effect on the axial force response. Also, by comparing the maximum stress and strain under the twelve loading combinations for the selected records, the maximum strain in the tunnel liner is less than the allowable strain rate for the concrete and in the case of loading, the stress in the tunnel liner is greater than the permitted stress Concrete and in the opposite direction are confident.
format	article
author	Reza Vahdani Mohsen Gerami Gholamreza Ghodrati Amiri seyed amin razavian amrei
author_facet	Reza Vahdani Mohsen Gerami Gholamreza Ghodrati Amiri seyed amin razavian amrei
author_sort	Reza Vahdani
title	Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
title_short	Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
title_full	Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
title_fullStr	Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
title_full_unstemmed	Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
title_sort	correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2020
url	https://doaj.org/article/4665a38a3a3c43c0a30465729dbaa019
work_keys_str_mv	AT rezavahdani correlationeffectsofseismiccomponentsnearfieldinurbancirculartunnelswithunreinforcedconcreteliners AT mohsengerami correlationeffectsofseismiccomponentsnearfieldinurbancirculartunnelswithunreinforcedconcreteliners AT gholamrezaghodratiamiri correlationeffectsofseismiccomponentsnearfieldinurbancirculartunnelswithunreinforcedconcreteliners AT seyedaminrazavianamrei correlationeffectsofseismiccomponentsnearfieldinurbancirculartunnelswithunreinforcedconcreteliners
_version_	1718441561862176768

Correlation effects of seismic components near field in urban circular tunnels with unreinforced concrete liners

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