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Effects of modeling strategies for a slab track on predicted ground vibrations

Malmborg, J. LU ; Persson, P. LU and Persson, K. LU (2020) In Soil Dynamics and Earthquake Engineering 136.
Abstract

In the paper, the effect of modeling strategies regarding the dynamic behavior of a railway slab track on a layered half-space is studied. The track is modeled with various degrees of accuracy through the use of either beam theory, shell finite elements or solid finite elements. The underlying soil response is included through a dynamic stiffness, obtained via the Green's function for a horizontally layered visco-elastic half-space in the frequency–wavenumber domain. The effect of different assumptions regarding the track cross-section behavior and the track–soil interface conditions on the resulting free-field vibrations are studied for a harmonic load moving along the track. First, only the out-of-plane displacements of the slab–soil... (More)

In the paper, the effect of modeling strategies regarding the dynamic behavior of a railway slab track on a layered half-space is studied. The track is modeled with various degrees of accuracy through the use of either beam theory, shell finite elements or solid finite elements. The underlying soil response is included through a dynamic stiffness, obtained via the Green's function for a horizontally layered visco-elastic half-space in the frequency–wavenumber domain. The effect of different assumptions regarding the track cross-section behavior and the track–soil interface conditions on the resulting free-field vibrations are studied for a harmonic load moving along the track. First, only the out-of-plane displacements of the slab–soil interface are coupled, i.e. only the vertical contact pressure is accounted for. Secondly, the effect of coupling the slab–soil in-plane displacements on the free-field vibrations is studied. It is found that the in-plane slab–soil coupling significantly affects the vertical vibration in the free-field. It is also found that a beam model of the track yields accurate response levels compared to a solid continuum model in the case of a thick slab, whereas considerable differences are obtained for a thin slab.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Finite element, Green's function, Moving frame of reference, Slab track, Train-induced ground vibration
in
Soil Dynamics and Earthquake Engineering
volume
136
article number
106254
publisher
Elsevier
external identifiers
  • scopus:85086456299
ISSN
0267-7261
DOI
10.1016/j.soildyn.2020.106254
language
English
LU publication?
yes
id
0a34728e-5bf5-4011-8106-14ff07193a69
date added to LUP
2020-06-21 12:36:40
date last changed
2020-07-01 05:34:15
@article{0a34728e-5bf5-4011-8106-14ff07193a69,
  abstract     = {<p>In the paper, the effect of modeling strategies regarding the dynamic behavior of a railway slab track on a layered half-space is studied. The track is modeled with various degrees of accuracy through the use of either beam theory, shell finite elements or solid finite elements. The underlying soil response is included through a dynamic stiffness, obtained via the Green's function for a horizontally layered visco-elastic half-space in the frequency–wavenumber domain. The effect of different assumptions regarding the track cross-section behavior and the track–soil interface conditions on the resulting free-field vibrations are studied for a harmonic load moving along the track. First, only the out-of-plane displacements of the slab–soil interface are coupled, i.e. only the vertical contact pressure is accounted for. Secondly, the effect of coupling the slab–soil in-plane displacements on the free-field vibrations is studied. It is found that the in-plane slab–soil coupling significantly affects the vertical vibration in the free-field. It is also found that a beam model of the track yields accurate response levels compared to a solid continuum model in the case of a thick slab, whereas considerable differences are obtained for a thin slab.</p>},
  author       = {Malmborg, J. and Persson, P. and Persson, K.},
  issn         = {0267-7261},
  language     = {eng},
  month        = {09},
  publisher    = {Elsevier},
  series       = {Soil Dynamics and Earthquake Engineering},
  title        = {Effects of modeling strategies for a slab track on predicted ground vibrations},
  url          = {http://dx.doi.org/10.1016/j.soildyn.2020.106254},
  doi          = {10.1016/j.soildyn.2020.106254},
  volume       = {136},
  year         = {2020},
}