Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Lombaert, Geert; Galvín, P.; François, Stijn; Degrande, Geert

doi:10.1016/j.jsv.2014.04.052

Cited by 41 publications

(25 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was found that 96.45% of the results were within this confidence region, and that most of the results from the scoping model were higher in magnitude than those obtained from the detailed model. The uncertainty of the predictions from the scoping model were within a range between −3 dB to 11 dB and thus similar to the 5 dB -20 dB values found in previous research [43][44][45]. The sensitivity analysis showed that soil material properties were a relevant parameter that could affect the accuracy of the vibration level prediction, due to the deviation shown in Figure 10.…”

Section: Remarks Of the Sensitivity Analysissupporting

confidence: 84%

Scoping assessment of building vibration induced by railway traffic

López-Mendoza

Romero

Connolly

et al. 2017

Soil Dynamics and Earthquake Engineering

Self Cite

View full text Add to dashboard Cite

This work presents a scoping model to predict ground-borne railway vibration levels within buildings considering soil-structure interaction (SSI). It can predict the response of arbitrarily complex buildings in a fraction of the time typically required to analyse a complex SSI problem, and thus provides a practical tool to rapidly analyse the vibration response of numerous structures near railway lines. The tool is designed for use in cases where the ground-borne vibration is known, and thus can be used as model input. Therefore in practice, for the case of a new line, the ground motion can be computed numerically, or alternatively, for the case of new buildings to be constructed near an existing line, it can be recorded directly (e.g. using accelerometers) and used as model input. To achieve these large reductions in computational time, the model discretises the ground-borne vibration in the free field into a frequency range corresponding to the modes that characterize the dynamic building response. After the ground-borne response spectra that corresponds with the incident wave field is estimated, structural vibration levels are computed using modal superposition, thus avoiding intensive soil-structure interaction computations. The model is validated using a SSI problem and by comparing results against a more complex finite element-boundary element model. Finally, the new scoping model is then used to analyse the effect of soil properties, building height, train speed and distance between the building and the track on structural-borne vibration. The results show that the scoping model provides a powerful tool for use during the early design stages of a railway system when a large number of structures require analysis.

show abstract

Section: Remarks Of the Sensitivity Analysissupporting

confidence: 84%

Scoping assessment of building vibration induced by railway traffic

López-Mendoza

Romero

Connolly

et al. 2017

Soil Dynamics and Earthquake Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…A good agreement is found with differences mainly found between −4.8 dB to 5.6 dB. Therefore the accuracy is similar to the uncertainty range between 5 dB to 20 dB as found in previous research [54,64,65].…”

Section: Discussionsupporting

confidence: 90%

“…The following describes the evaluation of train-track interaction forces (Figure 1 step 2.2). Both quasi-static excitation and dynamic excitation due to random track unevenness are taken into account [54], and the dynamic contributions depend upon the rail displacementsũ r (k y , ω) obtained using Equation (12).…”

Section: 5d Fem Formulationmentioning

confidence: 99%

Scoping assessment of free-field vibrations due to railway traffic

Galvín

Mendoza

Connolly

et al. 2018

Soil Dynamics and Earthquake Engineering

Self Cite

View full text Add to dashboard Cite

The number of railway lines both operational and under construction is growing rapidly, leading to an increase in the number of buildings adversely affected by ground-borne vibration (e.g. shaking and indoor noise). Post-construction mitigation measures are expensive, thus driving the need for early stage prediction, during project planning/development phases. To achieve this, scoping models (i.e. desktop studies) are used to assess long stretches of track quickly, in absence of detailed design information. This paper presents a new, highly customisable scoping model, which can analyse the effect of detailed changes to train, track and soil on ground vibration levels. The methodology considers soil stiffness and the combination of both the dynamic and static forces generated due to train passage. It has low computational cost and can predict free-field vibration levels in accordance with the most common international standards. The model uses the direct stiffness method to compute the soil Green's function, and a novel two-and-a-half dimensional (2.5D) finite element strategy for train-track interaction. The soil Green's function is modulated using a neural network (NN) procedure to remove the need for the time consuming computation of track-soil coupling. This modulation factor combined with the new train-track approach results in a large reduction in computational time. The proposed model is validated by comparing track receptance, free-field mobility and soil vibration with both field experiments and a more comprehensive 2.5D combined finite element-boundary element (FEM-BEM) model. A sensitivity analysis is undertaken and it is shown that track type, soil properties and train speed have a dominant effect on ground vibration levels. Finally, the possibility of using average shear wave velocity introduced for seismic site response analysis to predict vibration levels is investigated and shown to be reasonable for certain smooth stratigraphy's.

show abstract

“…The model of a load moving along a periodic (varying in space variable) Faculty of Civil Engineering, Cracow University of Technology, Chair of Rail & Air Transport Infrastructure, Poland structure has been analyzed by, for example, Auersch (2015), Bogacz et al (1998), Croft et al (2009), Hussein and Hunt (2009), Lombaert et al (2014) and Shenga et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Analytical evaluation of track response in the vertical direction due to a moving load

Czyczuła

Koziol

Kudła

et al. 2016

Journal of Vibration and Control

View full text Add to dashboard Cite

In the literature, typical analytical track response models are composed of beams (which represent the rail) on viscoelastic or elastic foundations. The load is usually considered as a single concentrated force (constant or varying in time) moving with constant speed. Concentrated or distributed loads or multilayer track models have rarely been considered. One can find some interesting results concerning analysis of distributed loads and multilayer track structures that include both analytical and numerical approaches. However, there is a noticeable lack of sufficient comparison between track responses under concentrated or distributed load and between one and multilayer track models. One of the unique features of the present paper is a comparison of data obtained for a series of concentrated and distributed loads, which takes into account a wide range of track parameters and train speeds. One of the fundamental questions associated with the multilayer track model is the level of coupling between the rail and the vibrations of the sleepers. In this paper, it is proved that sleepers are weakly coupled with the rail if the track is without significant imperfections, and the steady-state response is analyzed for this case. In other words, sleeper vibrations do not influence the rail vibrations significantly. Therefore the track is analyzed by means of a two-stage model. The first step of this model determines rail vibration under a moving load, and then the sleeper vibration is calculated from previously obtained kinematic excitation. The model is verified by comparison of the obtained results with experimental data. Techniques based on Fourier series are applied to the solution of the steady-state track response. Another important problem associated with track response under moving loads arises from the analysis of the effect of longitudinal forces in rails on vertical displacement. It is shown that, in the case of the steady-state response, longitudinal forces do not influence rail displacements significantly and this observation remains correct for a wide range of track parameters and train speeds. The paper also analyzes the legitimacy of the statement that additional rail deflection between sleepers, compared to the continuous rail support, can be considered as a track imperfection.

show abstract

Quantification of uncertainty in the prediction of railway induced ground vibration due to the use of statistical track unevenness data

Cited by 41 publications

References 28 publications

Scoping assessment of building vibration induced by railway traffic

Scoping assessment of building vibration induced by railway traffic

Scoping assessment of free-field vibrations due to railway traffic

Analytical evaluation of track response in the vertical direction due to a moving load

Contact Info

Product

Resources

About