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Jain, A. (author), Marykovskiy, Yuriy (author), Metrikine, A. (author), van Dalen, K.N. (author)Railway transition zones (RTZs) are regions where abrupt track stiffness changes occur that may lead to dynamic amplifications and subsequent track deterioration. The design challenges for these zones arise due to variations in material properties in both the depth (trackbed layers composed of different materials) and longitudinal directions of...journal article 2024
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Jain, A. (author), Metrikine, A. (author), Steenbergen, M.J.M.M. (author), van Dalen, K.N. (author)Railway transition zones (RTZs) experience higher rates of degradation compared to open tracks, which leads to increased maintenance costs and reduced availability. Despite existing literature on railway track assessment and maintenance, effective design solutions for RTZs are still limited. Therefore, a robust design criterion is required to...journal article 2024
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Jain, A. (author), van Dalen, K.N. (author), Metrikine, A. (author), Faragau, Andrei B. (author), Steenbergen, M.J.M.M. (author)ransition zones in railway tracks experience strong amplification of stress and strain fields due to the passage of train over inhomogeneity. The inhomogeneity in these zones can be attributed to changes in mechanical properties of material along the longitudinal direction of the track, and to displacement/traction discontinuities at interfaces...conference paper 2023
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Jain, A. (author), Metrikine, A. (author), Steenbergen, M.J.M.M. (author), van Dalen, K.N. (author)This comprehensive study addresses the persistent issue of railway transition zone degradation, evaluating the efficacy of the most commonly used mitigation measures and proposing a novel Safe Hull-Inspired Energy Limiting Design (SHIELD) of a transition structure. Firstly, this work assesses the traditional transition structures, including...journal article 2023
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Faragau, Andrei B. (author), Jain, A. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)This paper studies the effectiveness of adding auxiliary rails as a mitigation measure for degradation in transition zones of railway tracks. More specifically, it investigates the settlement mechanisms counteracted by the additional rails. Results show that when the system’s response is in the quasi-static regime, adding auxiliary rails over...conference paper 2023
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Sulollari, E. (author), van Dalen, K.N. (author), Cabboi, A. (author)Applying an oscillatory load is one of the most efficient ways to alter friction forces. Several theoretical and experimental studies on the influence of oscillatory loads on friction have been conducted, investigating the effect of both in-plane and out-of-plane oscillations for different tribological pairings. However, in the literature, the...journal article 2023
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Zhao, M. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)This paper presents a semi-analytical solution for the 3D problem of a cylindrical tunnel embedded in an elastic half-space subject to plane harmonic compressional and shear waves. Both the tunnel and soil are modelled as an elastic continuum. Conformal mapping is employed to transform the original physical domain with boundary surfaces of two...journal article 2023
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Dostal, Leo (author), Hollm, Marten (author), Metrikine, A. (author), Tsouvalas, A. (author), van Dalen, K.N. (author)This paper aims at investigating the existence of localized stationary waves in the shallow subsurface whose constitutive behavior is governed by the hyperbolic model, implying non-polynomial nonlinearity and strain-dependent shear modulus. To this end, we derive a novel equation of motion for a nonlinear gradient elasticity model, where the...journal article 2022
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Faragau, Andrei B. (author), van Dalen, K.N. (author), Metrikine, A. (author)Transition zones in railway tracks are areas with considerable variation of track properties (i.e., foundation stiffness) encountered near structures such as bridges. Due to strong amplification of the railway track’s response, transition zones are prone to rapid degradation. To study this degradation, researchers and engineers have developed...abstract 2022
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Zhang, J. (author), Faragau, Andrei B. (author), van der Esch, I.A. (author), Metrikine, A. (author), van Dalen, K.N. (author)Under harmonic excitation, soil exhibits softening behaviour that can be captured through the so-called hyperbolic soil model. The response of systems with such a material model can elegantly be obtained using the classical Harmonic Balance Method (HBM). Soil also exhibits nonlinear hysteretic damping under harmonic excitation, feature which is...abstract 2022
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Faragau, Andrei B. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)The study of periodic systems under the action of moving loads is of high practical importance in railway, road, and bridge engineering, among others. Even though plenty of studies focus on periodic systems, few of them are dedicated to the influence of a local inhomogeneous region, a so-called transition zone, on the dynamic response. In...journal article 2022
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Faragau, Andrei B. (author), Metrikine, A. (author), van Dalen, K.N. (author)Hyperloop is an emerging high-speed transportation system in which air resistance is minimised by having the vehicle travel inside a de-pressurised tube supported by columns. This design leads to a strong periodic variation of the stiffness (among other parameters) experienced by the vehicle. Also, along its route, the Hyperloop will encounter...conference paper 2022
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Sun, Z. (author), Kasbergen, C. (author), van Dalen, K.N. (author), Anupam, K. (author), Scarpas, Athanasios (author), Erkens, S. (author)The structural evaluation of existing pavements forms the basis for formulating cost-effective maintenance and rehabilitation strategies. A promising tool for pavement structural evaluation at network level is the Traffic Speed Deflectometer (TSD) test. However, the application of the TSD test is hindered by the lack of a robust and efficient...journal article 2022
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de Oliveira Barbosa, J.M. (author), Faragau, Andrei B. (author), van Dalen, K.N. (author), Steenbergen, M.J.M.M. (author)Locations in railway tracks where significant variations of the track properties occur are subject to increased track deterioration. To successfully mitigate this, the mechanisms leading to the increased deterioration need to be understood. To this end, this work presents a non-linear constitutive law for a lattice model able to describe the...journal article 2022
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- Faragau, Andrei B. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author) poster 2021
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Faragau, Andrei B. (author), Keijdener, C. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)Transition zones in railway tracks are locations with a significant variation of track properties (i.e. foundation stiffness) encountered near structures such as bridges and tunnels. Due to strong amplification of the track’s response, transition zones are prone to rapid degradation. To investigate the degradation mechanisms in transition...journal article 2021
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Zhao, M. (author), de Oliveira Barbosa, J.M. (author), Yuan, Jun (author), Metrikine, A. (author), van Dalen, K.N. (author)This paper investigates the instability of vertical vibrations of an object moving uniformly through a tunnel embedded in soft soil. Using the indirect Boundary Element Method in the frequency domain, the equivalent dynamic stiffness of the tunnel-soil system at the point of contact with the moving object, modelled as a mass-spring system or...journal article 2021
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de Oliveira Barbosa, J.M. (author), Faragau, Andrei B. (author), van Dalen, K.N. (author)The procedure presented in this work aims at providing a framework for studying settlement of ballast in zones with stiffness variation of the railway track support. The proposed procedure results from expanding an existing infinite periodic model of a railway track to account for variations in the stiffness of the foundation. Ballast is...journal article 2021
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Faragau, Andrei B. (author), de Oliveira Barbosa, J.M. (author), Keijdener, C. (author), Metrikine, A. (author), van Dalen, K.N. (author)Transition radiation is emitted when a source moves along a straight line with constant velocity and acts on or near an inhomogeneous medium [1]. It occurs, for example, when trains cross areas with substantial variation of track properties (e.g., foundation stiffness) encountered near rigid structures such as bridges; these areas are called...abstract 2020
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Sun, Z. (author), Kasbergen, C. (author), van Dalen, K.N. (author), Anupam, K. (author), Erkens, S. (author), Scarpas, Athanasios (author)Maintenance and rehabilitation strategies of pavements are usually made based on the results of performance evaluation. An efficient tool for pavement structural evaluation at network level is the traffic speed deflectometer (TSD) test. In order to deal with TSD measurements, this paper proposes a parameter back-calculation technique. Firstly,...conference paper 2020