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Investigación de vangarda para o desenvolvemento sostible

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Investigación de vangarda para o desenvolvemento sostible

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2022

Castanheira-Pinto, Alexandre; Fernández-Ruíz, Jesús; Colaço, Aires; Costa, Pedro Alves; Connolly, David P.

A simplified approach for predicting the non-linear critical speed of railway tracks Journal Article

In: Transportation Geotechnics, vol. 37, pp. 100865, 2022, ISSN: 2214-3912.

Abstract | Links | BibTeX | Etiquetas: Non-dimensional dynamic amplification functions, Non-linear critical speed, Railroad geodynamics, Railway dispersion curve technique, Railway track dynamics, Simplified railway dynamics methodology

@article{castanheira-pinto_simplified_2022b,

title = {A simplified approach for predicting the non-linear critical speed of railway tracks},

author = {Alexandre Castanheira-Pinto and Jesús Fernández-Ruíz and Aires Colaço and Pedro Alves Costa and David P. Connolly},

url = {https://www.sciencedirect.com/science/article/pii/S2214391222001490},

doi = {10.1016/j.trgeo.2022.100865},

issn = {2214-3912},

year  = {2022},

date = {2022-11-01},

urldate = {2026-08-10},

journal = {Transportation Geotechnics},

volume = {37},

pages = {100865},

abstract = {When trains approach the railway track-ground critical speed ground deformations are amplified, potentially exceeding the linear-elastic strain range in the supporting earthworks. This leads to non-linear soil behavior which can be difficult to model due to high computational cost and the need for detailed characterization of soil properties. As a solution, for the first time this research presents a simplified methodology to calculate the non-linear critical speed of track-ground structures. The methodology uses a novel semi-analytical approach that combines dispersion curves with a simplified linear equivalent model. Using the approach, a track-ground static strain field is first calculated, and then converted into a dynamic one using a non-dimensional dynamic amplification function, independent of the elastic properties of the soil. The result allows the non-linear critical speed to be calculated using static simulation results which are relatively straightforward to generate. The methodology is validated using a 3D non-linear Hardening Soil-small (HSSmall) numerical model and then a parametric study is used to compare results for both concrete slab and ballasted tracks. The results show the proposed approach is a reliable tool for predicting the non-linear critical speed.},

keywords = {Non-dimensional dynamic amplification functions, Non-linear critical speed, Railroad geodynamics, Railway dispersion curve technique, Railway track dynamics, Simplified railway dynamics methodology},

pubstate = {published},

tppubtype = {article}

}