Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines

One of the most important issues in operation of high-speed railway tracks is avoiding to sudden variation of the track stiffness. Culverts and bridges are common areas which this problem is occurred along the railway lines. One of the method for applying the gradual variation of the track stiffness...

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Autores principales:	Morteza Esmaeili, Mehdi Kamali, Hamidreza Heydari-Noghabi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2016
Materias:	transition zone approach slabs box culvert high speed railway lines numerical modeling Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/fc61a2185d134bd7becfd39cb0f377c4
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spelling	oai:doaj.org-article:fc61a2185d134bd7becfd39cb0f377c42021-11-08T15:45:49ZNumerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines2476-39772538-2616https://doaj.org/article/fc61a2185d134bd7becfd39cb0f377c42016-06-01T00:00:00Zhttps://www.jsce.ir/article_38591_276060c97f387c52d08d3c555bad77eb.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616One of the most important issues in operation of high-speed railway tracks is avoiding to sudden variation of the track stiffness. Culverts and bridges are common areas which this problem is occurred along the railway lines. One of the method for applying the gradual variation of the track stiffness in these areas is using the approach slabs in transition zone. Therefore, in this research it has attempted to study this problem using numerical simulation. In this regard, a typical culvert of Tehran-Qom-Esfahan high-speed railway line with 6.6 m length was simulated. Then for studying the effect of transition zones, an approach slab includes of three parts with 6m length and various thicknesses simulated by FE model. In this model the ballasted track and its components such as railpads, sleepers, ballast and subgrade were modeled as lumped mass-dashpot-spring systems and the rails, approach slabs and culvert were modeled by Euler-Bernoulli beam elements. Then the dynamic behavior of the transition zone investigated under the passing of the moving loads same as the axle loads of the ICE high speed train. In this matter a series of sensitivity analyses were carried out on some parameters such as vehicle speed, approach slab thickness as well as damping and stiffness of track. Consequently, the achieved results show that the increasing of damping and stiffness of the track cause to the ballast forces increased and in other side it causes to the acceleration and settlement of the ballasted track and the approach slabs decreased. These aforementioned effects are more obvious in damping values higher than 200 kN.sec/m and the track stiffness values in the range of 120 MN/m to 180 MN/m. Moreover, it was understood that increasing the approach slabs thickness has remarkable effect on improving the dynamic behavior of the transition zone especially in speeds more than 340 km/hr.Morteza EsmaeiliMehdi KamaliHamidreza Heydari-NoghabiIranian Society of Structrual Engineering (ISSE)articletransition zoneapproach slabsbox culverthigh speed railway linesnumerical modelingBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 3, Iss 1, Pp 112-128 (2016)
institution	DOAJ
collection	DOAJ
language	FA
topic	transition zone approach slabs box culvert high speed railway lines numerical modeling Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	transition zone approach slabs box culvert high speed railway lines numerical modeling Bridge engineering TG1-470 Building construction TH1-9745 Morteza Esmaeili Mehdi Kamali Hamidreza Heydari-Noghabi Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
description	One of the most important issues in operation of high-speed railway tracks is avoiding to sudden variation of the track stiffness. Culverts and bridges are common areas which this problem is occurred along the railway lines. One of the method for applying the gradual variation of the track stiffness in these areas is using the approach slabs in transition zone. Therefore, in this research it has attempted to study this problem using numerical simulation. In this regard, a typical culvert of Tehran-Qom-Esfahan high-speed railway line with 6.6 m length was simulated. Then for studying the effect of transition zones, an approach slab includes of three parts with 6m length and various thicknesses simulated by FE model. In this model the ballasted track and its components such as railpads, sleepers, ballast and subgrade were modeled as lumped mass-dashpot-spring systems and the rails, approach slabs and culvert were modeled by Euler-Bernoulli beam elements. Then the dynamic behavior of the transition zone investigated under the passing of the moving loads same as the axle loads of the ICE high speed train. In this matter a series of sensitivity analyses were carried out on some parameters such as vehicle speed, approach slab thickness as well as damping and stiffness of track. Consequently, the achieved results show that the increasing of damping and stiffness of the track cause to the ballast forces increased and in other side it causes to the acceleration and settlement of the ballasted track and the approach slabs decreased. These aforementioned effects are more obvious in damping values higher than 200 kN.sec/m and the track stiffness values in the range of 120 MN/m to 180 MN/m. Moreover, it was understood that increasing the approach slabs thickness has remarkable effect on improving the dynamic behavior of the transition zone especially in speeds more than 340 km/hr.
format	article
author	Morteza Esmaeili Mehdi Kamali Hamidreza Heydari-Noghabi
author_facet	Morteza Esmaeili Mehdi Kamali Hamidreza Heydari-Noghabi
author_sort	Morteza Esmaeili
title	Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
title_short	Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
title_full	Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
title_fullStr	Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
title_full_unstemmed	Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
title_sort	numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2016
url	https://doaj.org/article/fc61a2185d134bd7becfd39cb0f377c4
work_keys_str_mv	AT mortezaesmaeili numericalinvestigationofthebehaviorofapproachslabsintransitionzoneofballastedtracktoboxculvertinhighspeedrailwaylines AT mehdikamali numericalinvestigationofthebehaviorofapproachslabsintransitionzoneofballastedtracktoboxculvertinhighspeedrailwaylines AT hamidrezaheydarinoghabi numericalinvestigationofthebehaviorofapproachslabsintransitionzoneofballastedtracktoboxculvertinhighspeedrailwaylines
_version_	1718441719058399232

Numerical investigation of the behavior of approach slabs in transition zone of ballasted track to box culvert in high-speed railway lines

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