000013697 001__ 13697
000013697 005__ 20161114170252.0
000013697 04107 $$aeng
000013697 046__ $$k2011-05-25
000013697 100__ $$aCosta P., Alves
000013697 24500 $$aExperimental Validation of a 2.5D FEM-BEM Model for the Assessment of Vibrations Induced by Traffic

000013697 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013697 260__ $$bNational Technical University of Athens, 2011
000013697 506__ $$arestricted
000013697 520__ $$2eng$$aThis paper presents two main parts, encompassing the experimental assessment and the numerical modelling of vibrations induced by railway traffic. Firstly, a global description of an experimental trial field developed in the Portuguese railway network is presented. In that trial field several tests were performed in order to obtain a reasonable mechanical characterization of the main elements involved in the process of generation and propagation of waves induced by traffic. So as to reach the proposed goal, a geotechnical characterization campaign was performed, including crosshole tests and specific tests to estimate the ground damping properties. Concerning the track properties, receptance tests and a campaign of measurement of irregularities were conducted. After the global characterization of the site and of the track, vibrations induced by the railway traffic were then measured both in the railway track and in the free-field. The results of the tests are used in the validation of a 2.5D FEM/BEM model developed by the authors. The model fully accounts for the dynamic interaction between the train, the track and the layered ground. The railway track and embankment, assumed to be invariant in the longitudinal direction, are modelled with 2.5D finite elements [1]. On the other hand, the layered ground below the embankment is simulated by a 2.5D boundary elements formulation. This formulation allows an efficient solution of the track-ground dynamic interaction problem in the frequency-wavenumber domain, as recently explained by François et al. [2]. Regarding the modelling of the rolling stock, a multi-body model is adopted, where the main masses and suspensions of the train are incorporated. The study, involving experimental and numerical techniques, revealed to be very useful, allowing not only the experimental validation of the numerical model proposed by the authors, but also a deep understanding of the influence of several aspects who determine the problem’s solution.

000013697 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013697 653__ $$aTrack-ground vibrations induced by railway traffic; numerical modeling; experimental validation

000013697 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013697 720__ $$aCosta P., Alves$$iCalcada, R.$$iCardoso A., Silva
000013697 8560_ $$ffischerc@itam.cas.cz
000013697 8564_ $$s1364520$$uhttps://invenio.itam.cas.cz/record/13697/files/535.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 09 Dynamic Effects On High-Speed Railway Tracks.
000013697 962__ $$r13401
000013697 980__ $$aPAPER