Cargando…

Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer

This paper examines the effect of structural deformation on the unit slab-type ballastless track structure of high-speed railway. The principle of stationary potential energy was used to map the relation between girder vertical deformation and rail deformation considering the effect of subgrade boun...

Descripción completa

Detalles Bibliográficos
Autores principales: Nie, Leixin, Jiang, Lizhong, Zhou, Wangbao, Feng, Yulin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588476/
https://www.ncbi.nlm.nih.gov/pubmed/34772187
http://dx.doi.org/10.3390/ma14216653
_version_ 1784598470231851008
author Nie, Leixin
Jiang, Lizhong
Zhou, Wangbao
Feng, Yulin
author_facet Nie, Leixin
Jiang, Lizhong
Zhou, Wangbao
Feng, Yulin
author_sort Nie, Leixin
collection PubMed
description This paper examines the effect of structural deformation on the unit slab-type ballastless track structure of high-speed railway. The principle of stationary potential energy was used to map the relation between girder vertical deformation and rail deformation considering the effect of subgrade boundary conditions and the nonlinear contact of interlayer. The theoretical model was verified by comparing with the finite element analysis and experimental results. The theoretical model was used to analyze the effects of several key parameters on the rail deformation, such as vertical deformation amplitude, elastic modulus of the mortar layer, and vertical stiffness of the fasteners. The results show that the track slabs suffered significant disengagement, which makes the deformation of the track structure at the position of the beam joint tend to be gentle when nonlinear contact between the mortar layer and the track slabs was considered. The track slabs disengagement mainly occurs near the beam joints (the side of the deformed beam). As the deflection amplitude of the girder increases, the track deformation, the fastener forces and the disengagement length of the track slabs are obviously nonlinear. When the vertical stiffness of the fastener and/or the elastic modulus of the mortar layer increase, the fastener force and the track plate disengagement length increase monotonically and nonlinearly, which will adversely affect the life and safety of the track structure.
format Online
Article
Text
id pubmed-8588476
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-85884762021-11-13 Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer Nie, Leixin Jiang, Lizhong Zhou, Wangbao Feng, Yulin Materials (Basel) Article This paper examines the effect of structural deformation on the unit slab-type ballastless track structure of high-speed railway. The principle of stationary potential energy was used to map the relation between girder vertical deformation and rail deformation considering the effect of subgrade boundary conditions and the nonlinear contact of interlayer. The theoretical model was verified by comparing with the finite element analysis and experimental results. The theoretical model was used to analyze the effects of several key parameters on the rail deformation, such as vertical deformation amplitude, elastic modulus of the mortar layer, and vertical stiffness of the fasteners. The results show that the track slabs suffered significant disengagement, which makes the deformation of the track structure at the position of the beam joint tend to be gentle when nonlinear contact between the mortar layer and the track slabs was considered. The track slabs disengagement mainly occurs near the beam joints (the side of the deformed beam). As the deflection amplitude of the girder increases, the track deformation, the fastener forces and the disengagement length of the track slabs are obviously nonlinear. When the vertical stiffness of the fastener and/or the elastic modulus of the mortar layer increase, the fastener force and the track plate disengagement length increase monotonically and nonlinearly, which will adversely affect the life and safety of the track structure. MDPI 2021-11-04 /pmc/articles/PMC8588476/ /pubmed/34772187 http://dx.doi.org/10.3390/ma14216653 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Nie, Leixin
Jiang, Lizhong
Zhou, Wangbao
Feng, Yulin
Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title_full Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title_fullStr Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title_full_unstemmed Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title_short Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer
title_sort mapping relation between rail and bridge deformation considering nonlinear contact of interlayer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588476/
https://www.ncbi.nlm.nih.gov/pubmed/34772187
http://dx.doi.org/10.3390/ma14216653
work_keys_str_mv AT nieleixin mappingrelationbetweenrailandbridgedeformationconsideringnonlinearcontactofinterlayer
AT jianglizhong mappingrelationbetweenrailandbridgedeformationconsideringnonlinearcontactofinterlayer
AT zhouwangbao mappingrelationbetweenrailandbridgedeformationconsideringnonlinearcontactofinterlayer
AT fengyulin mappingrelationbetweenrailandbridgedeformationconsideringnonlinearcontactofinterlayer