Modeling of Railway Track Operation as a System of Quasi-Elastic Orthotropic Layers

Sycheva, Anna; Sychev, Vyacheslav; Buchkin, Vitaliy; Bykov, Yu. V.

doi:10.22227/1997-0935.2016.3.37-46

Cited by 3 publications

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“…Составим решение в виде отрезка ряда с пятью степенями [8,17]. Подставим в выражения (3), ( 4) k = -1, 0, 1, 2, 3, коэффициенты для фронта продольной волны:…”

Section: материалы и методыunclassified

“…3) или промышленных зданий, в реальности необходимо учитывать особенности железнодорожного пути, связанные с точечным приложением нагрузки от подвижного состава, большим количеством колесных пар, различным режимом движения (скорость следования экипажей, торможение, особенности поведения пути в прямых и кривых участках и т.д.) [8,9].…”

Section: Introductionunclassified

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Modeling of anisotropic base plate of a ballastless railway track under dynamic influences

Illarionova

Loktev

2020

Vestnik MGSU

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Introduction. Due to dynamic loading, the upper structure of the railway track is subject to deformation over the entire construction and operation period. This paper focuses on the development of a mathematical model of the base plate of a general-type ballastless railway track structure without relying on specific existing technological solutions used for such elements. The effect of the actually given vertical component of the rolling stock velocity arising from the deviation from the design position of the long-welded rails on the dynamic deflection of the plate and the contact force of cylindrical anisotropy and the initial rate of dynamic interaction is studied. The proposed model makes it possible to take into account the effect of elastic waves originating in the contact area between the wheel and the rail that move at their final speeds after contact. The actual issue researched in this paper is the reinforcement of the ballastless railway base plate for the prevention of severe damage in the base plate. Materials and methods. A mathematical model has been developed to describe the dynamic behavior of a reinforced concrete plate of a ballastless railway track taking into account the specifics of load application from rolling stock wheel sets. Results. Detailed presentation of the research results in the form of analytical expressions and dependence diagrams of dynamic and kinematic parameters of the structure behavior can have practical application when designing rapid transit and high-speed railway lines both in Russia and abroad. Conclusions. The obtained results can be used for carrying out full-fledged research of dynamic behavior of the track bed under mobile loading, for checking the local durability of plates under shock impact, for researching and selecting optimal rigidity parameters for the track bed.

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Section: материалы и методыunclassified

Section: Introductionunclassified

Modeling of anisotropic base plate of a ballastless railway track under dynamic influences

Illarionova

Loktev

2020

Vestnik MGSU

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The influence of wave processes on the reinforcement of the base plate of a ballast-free railway track

Illarionova

Loktev

2020

Vestnik MGSU

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Introduction. Since nowadays ballast-free track structures are most often used in combination with continuous welded track solutions for organizing a rail string, it should be emphasized that stresses arising in the rail string affect the stress-strain state of the entire construction of the track superstructure; therefore, it is necessary to monitor the current state of the continuous welded track. Nevertheless, kinks are formed and assembled rails and sleepers lose stability during the operational period of a continuous welded track, and methods are needed to determine the pre-failure conditions related to the temperature range of operation of a continuous track. Materials and methods. In this study, we propose a model of a flat structure made of a material having anisotropic properties, which makes it possible to take account of initiation and propagation of wave processes under the action of an external dynamic load. Results. The considered methods of simulating the propagation of elastic waves in a plate will make it possible to identify the points where direct and reflected waves of various orders converge; these waves can both increase and reduce the overall intensity of wave processes, leading to an increase or reduction in stresses and deformations in the characteristic points of a structure. Conclusions. The proposed solutions are most relevant for the structural elements of transport infrastructure facilities, since they are the ones that are exposed to alternating dynamic loads having varying intensity and time distribution of characteristic values.

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Mathematical Modeling of Sections of Variable Rigidity in Front of Artificial Structures

Vinogradov¹,

Loktev²,

Fazilova³

2018

Mir transp.

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For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version).ABSTRACT The article deals with the features of the transition zone from the ballast under-sleeper base to the bridge structure with various types of span structures, as well as the sections of the ballastless track, conjugated with the transient zone. An analytical model is proposed for describing the dynamic behavior of a railway track in the form of a transversely isotropic plate with variable rigidity parameters. Examples of the use of the proposed model for calculating the dynamic depression of a roadbed under the influence of a rolling stock with different freight and speed characteristics are given. Keywords: railway, bridge, roadbed, residual deformation, variable rigidity section, track depression, slope, elastic wave, track profile, transversal-isotropic plate.

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Modeling of Railway Track Operation as a System of Quasi-Elastic Orthotropic Layers

Cited by 3 publications

References 0 publications

Modeling of anisotropic base plate of a ballastless railway track under dynamic influences

Modeling of anisotropic base plate of a ballastless railway track under dynamic influences

The influence of wave processes on the reinforcement of the base plate of a ballast-free railway track

Mathematical Modeling of Sections of Variable Rigidity in Front of Artificial Structures

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