000021520 001__ 21520
000021520 005__ 20170622131250.0
000021520 04107 $$aeng
000021520 046__ $$k2017-06-15
000021520 100__ $$aSanches, R.
000021520 24500 $$aPHYSICAL AND GEOMETRICAL NONLINEAR DYNAMIC ANALYSIS OF BEAMS ON FOUNDATIONS UNDER MOVING LOADS

000021520 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021520 260__ $$bNational Technical University of Athens, 2017
000021520 506__ $$arestricted
000021520 520__ $$2eng$$aThe vibration of beams on foundations subjected to moving loads is an important engineering problem, namely in high-speed railway track design; for some (critical) velocities of the load, the beam’s oscillation amplitudes may become very large thus endangering the structural and passengers safety. This presentation is dedicated to the finite element analysis of the behavior of Euler-Bernoulli beams on foundations under moving loads. The goal of this study is to generalize, for more realistic foundation behaviors, the analyses performed by other authors so that it could be useful in railway track design. Thus, the foundations are considered to be tensionless (null tensile stiffness) while under compression their reaction force depends on the transverse displacement of the beam according to a cubic law. The consideration of tensionless foundations leads to large deflections of the beam. Consequently, the finite element formulation of the problem is derived taking into account the geometrical nonlinear behavior of the beam and the semi-discrete system of dynamic governing equations is solved by the HHT-alpha method. Critical velocities of the moving loads are computed and the effect of the physical and geometrical nonlinear behavior of the system on their values is analyzed.

000021520 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021520 653__ $$a

000021520 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021520 720__ $$aSanches, R.$$iCosta, A. Pinto Da$$iSimões, F.M.F.
000021520 8560_ $$ffischerc@itam.cas.cz
000021520 8564_ $$s116650$$uhttps://invenio.itam.cas.cz/record/21520/files/16836.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS01] Advances in Computational Structural Vibrations
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000021520 962__ $$r21500
000021520 980__ $$aPAPER