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Quantifying the impact of stiffness distributions on the dynamic behaviour of railway transition zones

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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Design of railway transition zones: A novel energy-based criterion

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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Railway transition zones: evaluation of existing transition structures and a newly proposed transition structure

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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Vibration-induced friction modulation for a general frequency of excitation

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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Semi-analytical solution for the 3D response of a tunnel embedded in an elastic half-space subject to seismic waves

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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Localized stationary seismic waves predicted using a nonlinear gradient elasticity model

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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Dynamic amplification in a periodic structure with a transition zone subject to a moving load: Three different phenomena

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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A parameter identification technique for traffic speed deflectometer tests of pavements

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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Modelling ballast via a non-linear lattice to assess its compaction behaviour at railway transition zones

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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Transition radiation in a nonlinear and infinite one-dimensional structure: a comparison of solution methods

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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Instability of vibrations of an oscillator moving at high speed through a tunnel embedded in soft soil

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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A lattice model for transition zones in ballasted railway tracks

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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A nonlinear spectral element model for the simulation of traffic speed deflectometer tests of asphalt pavements

Sun, Z. (author), Kasbergen, C. (author), Scarpas, Athanasios (author), van Dalen, K.N. (author), Anupam, K. (author), Erkens, S. (author)

A non-destructive testing method suitable for network-level pavement structural evaluation is the traffic speed deflectometer (TSD) test. However, the analysis of TSD measurements still needs a proper parameter back-calculation procedure, which requires an accurate and efficient forward calculation model. As a first step to solving this issue...

journal article 2020

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Tower shadow excitation of a downwind rotor blade of a turbine with a tubular tower

van der Male, P. (author), van Schaik, R. (author), Vergassola, M. (author), van Dalen, K.N. (author)

The downwind configuration of wind turbines offers benefits regarding the blade-tower clearance, as during operation the blade primarily bends away from the tower. Consequently, the blades can be designed with lower stiffness. For tubular towers, however, a significant deficit of the wind speed in the tower wake occurs, resulting in fatigue...

journal article 2020

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Transition radiation in an infinite one-dimensional structure interacting with a moving oscillator—the Green's function method

Faragau, Andrei B. (author), Mazilu, Traian (author), Metrikine, A. (author), Lu, T. (author), van Dalen, K.N. (author)

Transition zones in railway tracks are areas with considerable variation of track properties (e.g., foundation stiffness) which may cause strong amplification of the response, leading to rapid degradation of the track geometry. Two possible indicators of degradation in the supporting structure are identified, namely the wheel-rail contact...

journal article 2020

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Seismic inversion of soil damping and stiffness using multichannel analysis of surface wave measurements in the marine environment

Armstrong, Michael (author), Ravasio, Matteo (author), Versteijlen, W.G. (author), Verschuur, D.J. (author), Metrikine, A. (author), van Dalen, K.N. (author)

Determination of soil material damping is known to be difficult and uncertain, especially in the offshore environment. Using an advanced inversion methodology based on multichannel spectral analysis, Scholte and Love wave measurements are used to characterize subsea soil from a North Sea site. After normalization, a determinant-based objective...

journal article 2020

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Transition radiation in a piecewise-linear and infinite one-dimensional structure–a Laplace transform method

Faragau, Andrei B. (author), Metrikine, A. (author), van Dalen, K.N. (author)

Transition zones in railway tracks are areas with considerable variation of track properties (i.e., foundation stiffness) encountered near structures such as bridges and tunnels. Due to strong amplification of the response, transition zones require frequent maintenance. To better understand the underlying degradation mechanisms, a one...

journal article 2019

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Dynamic analysis of layered systems under a moving harmonic rectangular load based on the spectral element method

Sun, Z. (author), Kasbergen, C. (author), Scarpas, Athanasios (author), Anupam, K. (author), van Dalen, K.N. (author), Erkens, S. (author)

In order to design high-performance roadways, a robust tool which can compute the structural response caused by moving vehicles is necessary. Therefore, this paper proposes a spectral element method-based model to accurately and effectively predict the 3D dynamic response of layered systems under a moving load. A layer spectral element and a...

journal article 2019

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Dynamic response of an infinite beam periodically supported by sleepers resting on a regular and infinite lattice: Semi-analytical solution

de Oliveira Barbosa, J.M. (author), van Dalen, K.N. (author)

In this work we propose a model for the analysis of the dynamic behaviour of a ballasted track that combines discrete and continuous elements. The rail is modelled via an Euler-Bernoulli beam, the periodically spaced sleepers are represented with lumped masses, and the ballast is simulated using a lattice (regular network of elastically...

journal article 2019

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Dynamic soil stiffness for foundation piles: Capturing 3D continuum effects in an effective, non-local 1D model

Versteijlen, W.G. (author), de Oliveira Barbosa, J.M. (author), van Dalen, K.N. (author), Metrikine, A. (author)

A method is presented to accurately capture the 3D interaction phenomena of a foundation pile embedded in soil, in a computationally efficient non-local 1D model. It is shown how to extract the global stiffness kernels from simulations with the 3D inhomogeneous continuum, and implement them in a 1D non-local Winkler-type model that can...

journal article 2018