000021683 001__ 21683
000021683 005__ 20170622131259.0
000021683 04107 $$aeng
000021683 046__ $$k2017-06-15
000021683 100__ $$aSwesi, Alaa
000021683 24500 $$aMODELLING COCNCRETE MATERIAL BEHAVIOUR UNDER HIGH LOADING RATES

000021683 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021683 260__ $$bNational Technical University of Athens, 2017
000021683 506__ $$arestricted
000021683 520__ $$2eng$$aThe present work sets out to investigate numerically, by means of dynamic Nonlinear Finite-Element Analysis (NLFEA), the effect of the strain-rate exhibited under high loading rates (associated usually with blast and impact problems) on the material properties of structural concrete and the ensuing cracking process it undergoes. The numerical predictions obtained were initially validated against relevant published data obtained from tests on plain concrete prismatic and cylindrical specimens under increasing loading rates under direct or indirect tension, uniaxial compression and flexure. The numerical studies reveal that the responses under impact loading differ significantly from those under static loading once certain thresholds of loading rates are exceeded. The study builds on previous work [1-3], which has shown that the commonly observed stress-strain relationship of plain concrete specimens under high rates of loading actually describes dynamic structural response rather than material behaviour. A couple of finite element packages were used, in the present study, which adopt different approaches for modelling concrete material behaviour. The comparative analysis of the predictions obtained reveals that when realistically accounting for the brittle nature and the triaxiality which characterise concrete material behavior, the experi-

000021683 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021683 653__ $$aConcrete, Material Properties, Cracking, Loading Rate, Finite-Element Analysis, Software Packages, Nonlinear Dynamic Analysis, Brittle Behaviour

000021683 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021683 720__ $$aSwesi, Alaa$$iCotsovos, Demetris$$iAbbas, Ali
000021683 8560_ $$ffischerc@itam.cas.cz
000021683 8564_ $$s985354$$uhttps://invenio.itam.cas.cz/record/21683/files/17500.pdf$$yOriginal version of the author's contribution as presented on CD, section: [RS11] Nonlinear dynamics
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000021683 962__ $$r21500
000021683 980__ $$aPAPER