000015763 001__ 15763
000015763 005__ 20161115135329.0
000015763 04107 $$aeng
000015763 046__ $$k2013-06-12
000015763 100__ $$aCoulier, P.
000015763 24500 $$aA Numerical Study of Subgrade Stiffening As a Mitigation Measure for Railway Induced Vibrations Through 2.5d and 3D Fe-Be Models

000015763 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015763 260__ $$bNational Technical University of Athens, 2013
000015763 506__ $$arestricted
000015763 520__ $$2eng$$aThis paper studies the efficiency of subgrade stiffening next to the track as a mitigation measure for railway induced vibrations. A computationally efficient two-and-a-halfdimensional (2.5D) methodology is first employed, assuming invariance of the geometry in the longitudinal direction. An analysis in the frequency–wavenumber domain reveals that an infinitely long block of stiffened soil next to the track can act as a wave impeding barrier. It is demonstrated that the wave impeding effect depends on the relation between the Rayleigh wavelength in the soil and the free bending wavelength in the block of stiffened soil, as the transmission of plane waves in the soil with a longitudinal wavelength smaller than the bending wavelength is hindered. This leads to a critical frequency from which this mitigation measure starts to be effective, depending on the stiffness contrast between the soil and the block of stiffened soil. The existence of a critical angle delimiting an area where vibration levels are reduced in case of harmonic excitation on the rail is also demonstrated. Fully three–dimensional (3D) calculations are finally performed to assess the vibration reduction efficiency if subgrade stiffening is only implemented along a finite length, indicating that the length of the block should be approximately two times the free bending wavelength of an infinitely long beam in order to ensure that a finite block can act as a wave impeding barrier.

000015763 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015763 653__ $$aRailway induced vibrations, dynamic soil–structure interaction, elastodynamic wave propgation, finite element–boundary element coupling.

000015763 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015763 720__ $$aCoulier, P.$$iFranCois, S.$$iDegrande, G.$$iLombaert, G.
000015763 8560_ $$ffischerc@itam.cas.cz
000015763 8564_ $$s6146758$$uhttps://invenio.itam.cas.cz/record/15763/files/1414.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 07 DYNAMIC EFFECTS ON HIGH-SPEED RAILWAY TRACKS
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000015763 962__ $$r15525
000015763 980__ $$aPAPER