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ARTICLE
Numerical investigation on train-induced environmental vibration in floating ladder tracks
1
Center of Excellence in Railway Transportation, Iran University of Science and Technology, Tehran, Iran
2
School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran
3
Acoustical and Mechanical Engineering Laboratory (LEAM), Universitat Polit`ecnica de Catalunya, Barcelona, Spain
4
Yazd University, Yazd, Iran
Submission date: 2019-08-24
Final revision date: 2019-12-29
Acceptance date: 2020-02-02
Online publication date: 2020-10-15
Publication date: 2020-10-15
Corresponding author
Jabbar Ali Zakeri
school of railway engineering, Iran university of science and technology, Tehran, Iran
school of railway engineering, Iran university of science and technology, Tehran, Iran
Journal of Theoretical and Applied Mechanics 2020;58(4):871-883
KEYWORDS
TOPICS
ABSTRACT
A floating ladder track is established in the present paper as a next-generation non-ballasted
track system. The three-dimensional model consists of a track (mass-spring-damping system)
and the underlying soil. Rectangular pulse loading with an amplitude of 60 kN is considered
as the wheel loading system. A time domain coupled finite element with a semi-infinite
absorbing boundary condition is employed using FEM software. Due to axial symmetry
of the model instead of the track axle, only half of the model is simulated. It is observed
that the performance of the floating ladder track is better in mitigating measured vibration
than that of the traditional ballasted track. Numerical results of the floating ladder track
reveal that the increase of damping and stiffness yields more vibration responses, which is a
straight nonlinear relationship. Although increasing density of the protective layer decreases
vibrations on the ground, it has no effect on structural components of the track except for
the protective layer. Furthermore, this kind of track is more effective at a closer distance to
the source of vibrations.
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