Effect of axle load spreading and support stiffness on the dynamic response of short span railway bridges
2014 (English)In: Structural Engineering International, Vol. 4, 457-465 p.Article in journal (Refereed) Published
In dynamic analyses of railway bridges, the train axle loads are often modeled as moving point forces. However, one effect of the ballast is to spread these point forces. This can lead to large reductions of the bridge response, especially for short span bridges. For this reason, Eurocode prescribes to distribute the axle loads over three adjacent sleepers. In this paper, the axle load distribution is first studied using a plane finite element analysis and based on that, a triangular load distribution is proposed. Then, numerical simulations are performed to compare the effect of this load distribution with the Eurocode one. Both simply supported bridges and bridges with integrated backwalls, all with span lengths less than 10m, are studied. For the later bridges, the effect of the stiffness of the foundation has been studied by adding springs at the supports.
Place, publisher, year, edition, pages
2014. Vol. 4, 457-465 p.
Dynamic response, Finite element analysis, Load spread, Short span railway bridges, Support stiffness.
IdentifiersURN: urn:nbn:se:kth:diva-157638DOI: 10.2749/101686614X13854694314360ISI: 000350786300002ScopusID: 2-s2.0-84913541027OAI: oai:DiVA.org:kth-157638DiVA: diva2:770796
QC 201502022014-12-112014-12-112015-04-13Bibliographically approved