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The non-linear influence of ballast on the vibrations of railway bridges
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0003-2104-382X
2012 (English)In: Proceedings of the Eleventh International Conference on Computational Structures Technology, 2012Conference paper (Refereed)
Abstract [en]

In numerical dynamic analyses of railway bridges, the ballast is either considered as an additional mass or modeled using a mass-spring-damper system between the bridge deck and the sleepers. In both cases, the influence of the ballast on the natural frequencies of the bridge is neglected. However, a research project at the Division of Structural Engineering and Bridges at KTH has shown that the ballast may influence significantly the first natural frequency of bridges. To consider that aspect, a new finite beam element model has been developed. The main feature of the element is that the effect of the ballast is introduced through a non-linear longitudinal stiffness associated to the slip at the interface between the bridge and the ballast. This simple element can be used to model accurately the vertical vibrations in bridges, which allows a better prediction of the fatigue life.

Place, publisher, year, edition, pages
, Civil-Comp Proceedings, ISSN 1759-3433 ; 99
Keyword [en]
Ballast, Dynamic analyses, Finite elements, Railway bridges
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-104626ScopusID: 2-s2.0-84893930328ISBN: 978-190508854-6OAI: diva2:565525
11th International Conference on Computational Structures Technology, CST 2012; Dubrovnik; Croatia; 4 September 2012 through 7 September 2012

QC 20140512

Available from: 2012-11-07 Created: 2012-11-07 Last updated: 2014-05-12Bibliographically approved

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