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Analysis on dynamic performance of different track transition forms using the discrete element/finite difference hybrid method
(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China)
(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China)
(School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, PR China)
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2020 (English)In: Computers & structures, ISSN 0045-7949, E-ISSN 1879-2243, Vol. 230, article id 106187Article in journal (Refereed) Published
Abstract [en]

To analyze the mesodynamic and macrodynamic performance of the track transitions more precisely, a bridge-embankment transition model has been established by combining the discrete element method (DEM) with the finite difference method (FDM). In this model, the DEM is utilized to model sleepers and ballast particles with complex shape, and the FDM is applied to simulate the abutment, transition section and embankment. The DEM/FDM coupled model is then achieved by exchanging displacements, velocities, and contact forces at the interface. Afterwards, the influence of the transition section parameters and transition forms on dynamic behaviour of the track-substructure system is studied under measured rail seat load. The numerical simulations indicate that the increase of the transition section elastic modulus, decrease of the backfill slope values and the transition form of trapezoid backfill following by inverted trapezoid backfill can provide a better displacement gradient between the abutment and the embankment. Additionally, the results show that the inverted trapezoid transition form can provide a better transition of the track dynamic performance than the trapezoid transition form and the embankment soil over the wedge-shape backfill has the tendency to propagate along the slope toward the embankment section under the moving train load for the trapezoid transition form.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 230, article id 106187
Keywords [en]
Discrete-continuum, Combined simulation, Track transition forms, Track-substructure system, Dynamic performance
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering, Structural Engineering and Bridges
Identifiers
URN: urn:nbn:se:kth:diva-266807DOI: 10.1016/j.compstruc.2019.106187ISI: 000518666100001Scopus ID: 2-s2.0-85077735737OAI: oai:DiVA.org:kth-266807DiVA, id: diva2:1388177
Note

QC 20200427

Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-04-27Bibliographically approved

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