Mechanics and Novel Designs of Polymeric Railway Sleepers in Track Structure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F24%3A00376613" target="_blank" >RIV/68407700:21110/24:00376613 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.4203/ccc.7.20.6" target="_blank" >https://doi.org/10.4203/ccc.7.20.6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4203/ccc.7.20.6" target="_blank" >10.4203/ccc.7.20.6</a>

Result language

angličtina

Original language name

Mechanics and Novel Designs of Polymeric Railway Sleepers in Track Structure

Original language description

Polymer sleepers can combine a stiffness behaviour comparable to timber sleepers with the consistency and lifespan of concrete sleepers, but their specific characteristics and potential advantages should be considered: material viscoelasticity, bending stiffness range, and freedom of shape. Due to viscoelasticity, laboratory tests on polymer sleepers should be performed dynamically, at strain rates applicable to in-track conditions. Cyclic loading should be performed intermittently, introducing pauses between cycling to reduce heating, creep effects and to give track representative results. In analyses, polymer (and timber) sleepers should be considered a beam on an elastic foundation, because of their limited bending stiffness. To accommodate analytical calculations, a simplified calculation method was derived, using a sleeper flexibility factor to account for sleeper bending effects on track deflections. As a result of repeated train loads, a gap arises between the rail seat location and ballast, and the sleeper shapes according to this gap (i.e. beds-in) on every train passage, causing equalization of the contact stresses over the sleeper length and ballast. Optimisation show that balancing the sleeper (prevention of centre-bound) can reduce resilient rail seat displacements by up to 40% without increasing material usage but only utilizing moulding processes allowing the freedom of sleeper shape.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance

ISBN

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ISSN

2753-3239

e-ISSN

2753-3239

Number of pages

15

Pages from-to

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Publisher name

Civil-Comp Press

Place of publication

Edinburgh

Event location

Praha

Event date

Sep 1, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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