000013327 001__ 13327
000013327 005__ 20161114160336.0
000013327 04107 $$aeng
000013327 046__ $$k2009-06-22
000013327 100__ $$aCosta P., A.
000013327 24500 $$aInfluence of soil non linearity in the dynamic response of high speed railway track

000013327 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013327 260__ $$bNational Technical University of Athens, 2009
000013327 506__ $$arestricted
000013327 520__ $$2eng$$aThe main objectives of the paper are to evaluate the relevance of the non-linear soil behavior on the track response and to validate the proposed methodology which includes these effects through an equivalent linear analysis. The proposed numerical model is based on 2.5D finite/infinite elements method that is coupled to an iterative procedure in order to fulfill the agreement between strain level and dynamic properties of the materials. To validate the model, the case study of Ledsgard is simulated, and the experimental and numerical results of displacements of the track are compared for several speeds of circulation of the train X2000. It is identified that the stiffness degradation, function of the strain level, plays a relevant role when dealing with high speed lines on soft ground. Moreover, the simulations developed with the proposed methodology reveal results very close to those observed, independently of the train speed, contrary to what was verified when the elastic linear model is used.

000013327 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013327 653__ $$ahigh speed railway track, soft soil, equivalent linear analysis, finite element method, frequency domain analysis. Abstract. The main objectives of the paper are to evaluate the relevance of the non-linear soil behavior on the track response and to validate the proposed methodology which includes these effects through an equivalent linear analysis. The proposed numerical model is based on 2.5D finite/infinite elements method that is coupled to an iterative procedure in order to fulfill the agreement between strain level and dynamic properties of the materials. To validate the model, the case study of Ledsgard is simulated, and the experimental and numerical results of displacements of the track are compared for several speeds of circulation of the train X2000. It is identified that the stiffness degradation, function of the strain level, plays a relevant role when dealing with high speed lines on soft ground. Moreover, the simulations developed with the proposed methodology reveal results very close to those observed, independently of the train speed, contrary to what was verified when the elastic linear model is used.

000013327 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013327 720__ $$aCosta P., A.$$iCalcada, R.$$iCardoso A., S.$$iBodare, A.
000013327 8560_ $$ffischerc@itam.cas.cz
000013327 8564_ $$s620763$$uhttps://invenio.itam.cas.cz/record/13327/files/CD480.pdf$$yOriginal version of the author's contribution as presented on CD, section: Dynamic effects on high-speed railway tracks - iii (MS).
000013327 962__ $$r13074
000013327 980__ $$aPAPER