Finite element modelling of geotechnical structures subjected to moving loads

Brinkgreve, Rbj; Galavi, Vahid

doi:10.1201/b17017-44

Cited by 25 publications

(16 citation statements)

References 1 publication

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“…1a) were modelled using nonlinear materials in which the nonlinearity was taken into account via an equivalent linear material in accordance with the approach described by Madshus and Kaynia (1999). The properties of all materials considered for this model are summarized in Table 1. In any dynamic analysis, the finite element size, model boundaries and time step have to be selected carefully to ensure the accuracy of results (Galavi and Brinkgreve, 2014). In general, the element size of the FE model was estimated based on the smallest wavelength that allows the high-frequency motion to be simulated correctly.…”

Section: Track Geometry and Materialsmentioning

confidence: 99%

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Three-dimensional numerical modelling of ballasted railway track foundations for high-speed trains with special reference to critical speed

Sayeed

Shahin

2016

Transportation Geotechnics

103

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Due to recent congestion of highways in many countries around the world, railways have become the most popular means of public transportation, which has increased the demand for heavier and faster trains. High speeds and heavy loads of trains are usually accompanied with large vibrations in the train-track-ground system, especially when train speed reaches its critical value, leading to possible train derailment and track damages. This unwanted scenario makes it important for railway geotechnical engineers to investigate the behaviour of ballasted railway track foundations for high-speed trains, with special reference to critical speed. In the current paper, a sophisticated three-dimensional (3D) finite element (FE) modelling was developed to simulate the dynamic response of ballasted railway tracks subjected to train moving loads, and the critical speed was investigated for various traintrack-ground system conditions. The results were presented in terms of the evolution of the coefficient of dynamic amplification of sleeper deflection versus train speed, which have been synthesized into simple sensitivity charts that can be used to determine the critical speed corresponding to the conditions of a particular train-track-ground system.

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Section: Track Geometry and Materialsmentioning

confidence: 99%

“…In this fashion, a series of train wheels was considered to be moving along the track. During the simulation of moving loads, the time step was chosen based on the well-known Courant-Friedrichs-Lewy condition which is mathematically represented as follows (Galavi and Brinkgreve, 2014):…”

Section: Simulation Of Train Moving Loadsmentioning

confidence: 99%

Three-dimensional numerical modelling of ballasted railway track foundations for high-speed trains with special reference to critical speed

Sayeed

Shahin

2016

Transportation Geotechnics

103

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“…While using ARIMA, the imposing restriction such as serious issues of endogeneity, heterogeneity and identification can be ignored with their consequences. Although it is sometimes difficult on empirical ground to make choice on appropriate modelling techniques to represent the real world situations, the performance of forecasting accuracy proven in past literature in such influential studies as (Lal, Jain, and Sinha, 1987;Carter & Narasimhan, 1996;Galavi & Brinkgreve, 2014) informed the adoption of Autoregressive Moving Average (ARMA) or Autoregressive Integrated Moving Average (ARIMA) for this study. This technique is based on Box-Jenkins timeseries procedure proposed by Bartholomew (1971) that combines Autoregressive (AR) and Moving Average (MA).…”

Section: Methodsmentioning

confidence: 99%

Re-Evaluation of World Population Figures: Politics and Forecasting Mechanics

Shobande

Shodipe

2020

Economics and Business

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This paper forecasts the world population using the Autoregressive Integration Moving Average (ARIMA) for estimation and projection for short-range and long-term population sizes of the world, regions and sub-regions. The study provides evidence that growth and population explosion will continue in Sub-Saharan Africa, tending the need to aggressively promote pragmatic programmes that will balance population growth and sustainable economic growth in the region. The study argued that early projections took for granted the positive and negative implications of population growth on the social structure and offset the natural process, which might have implication(s) on survival rate. Given the obvious imbalance in population growth across continents and regions of the world, a more purposeful inter-regional and economic co-operation that supports and enhances population balancing and economic expansion among nations is highly recommended. In this regard, the United Nations should compel member states to vigorously and effectively implement domestic and international support programmes with this objective in view.

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“…sleeper, ballast and subgrade) were characterized using 3D solid elements. A total of 133 sleepers were placed along the rail at spacing of 0.6 m. In the FE dynamic analyses, the finite element size, model boundaries and time step have to be selected carefully to ensure the accuracy of the results [17]. In general, the element size of the FE model is usually estimated based on the smallest wave-length that allows the high-frequency motion to be simulated correctly.…”

Section: Numerical Modelling Approachmentioning

confidence: 99%

“…In this fashion, a series of train wheels was considered to be moving along the track. During simulation of the train moving loads, the time step was selected based on the well-known Courant-Friedrichs-Lewy condition [17]. All FE analyses were performed in the time domain, which is more natural to reproduce the transient phenomenon of wave propagation [22].…”

Section: Numerical Modelling Approachmentioning

confidence: 99%

Investigation into Some Design Aspects of Ballasted Railway Track Foundations using Numerical Modelling

Sayeed¹,

Shahin²

2018

World Congress on Civil, Structural, and Environmental Engineering

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Railways have become the most popular means of public transportation in many countries around the world. Therefore, an investigation into the impact of design parameters affecting the overall behaviour of railway track foundations under train dynamic loading is necessary for optimum and reliable design. Railway track foundations consist of a graded layer of granular media of ballast and subballast, which is laid on a naturally deposited subgrade soil. Most available methods for design of ballasted railway track foundations assume linear elastic behaviour for track geomaterials. However, the resilient behaviour of track geomaterials, especially the ballast layer, is mostly non-linear and may incur plasticity, depending on the level of applied stress. In this paper, a sophisticated three-dimensional finite element modelling is developed to investigate the track response subjected to train moving loads, by considering actual characteristics of track geomaterials including non-linearity and plasticity. The results are compared with the simpler elastic modelling response, and the practical implications are discussed.

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Finite element modelling of geotechnical structures subjected to moving loads

Cited by 25 publications

References 1 publication

Three-dimensional numerical modelling of ballasted railway track foundations for high-speed trains with special reference to critical speed

Three-dimensional numerical modelling of ballasted railway track foundations for high-speed trains with special reference to critical speed

Re-Evaluation of World Population Figures: Politics and Forecasting Mechanics

Investigation into Some Design Aspects of Ballasted Railway Track Foundations using Numerical Modelling

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