Mesoscale approach to modeling concrete subjected to thermomechanical loading / Peter Grassl in Journal of engineering mechanics, Vol. 136 N° 3 (Mars 2010)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 136 N° 3 (Mars 2010) . - pp. 322-328 Titre : Mesoscale approach to modeling concrete subjected to thermomechanical loading Type de document : texte imprimé Auteurs : Peter Grassl, Auteur ; Pearce, Chris, Auteur Article en page(s) : pp. 322-328 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Concrete Cracking Thermal analysis Plasticity Strains Load factors. Résumé : Concrete subjected to combined compressive stresses and temperature loading exhibits compressive strains, which are considerably greater than for concrete subjected to compressive stresses alone. This phenomenon is called transient thermal creep or load induced thermal strain and is usually modeled by macroscopic phenomenological constitutive laws which have only limited predictive capabilities. In the present study a mesoscale modeling approach is proposed in which the macroscopically observed transient thermal creep results from the mismatch of thermal expansions of the mesoscale constituents. The mesostructure of concrete is idealized as a two-dimensional three-phase material consisting of aggregates, matrix, and interfacial transition zones. The nonlinear material response of the phases is described by a plasticity interface model. The mesoscale approach was applied to analyze compressed concrete specimens subjected to uniform temperature histories and the analysis results were compared to experimental results reported in the literature. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Mesoscale approach to modeling concrete subjected to thermomechanical loading [texte imprimé] / Peter Grassl, Auteur ; Pearce, Chris, Auteur . - pp. 322-328. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 3 (Mars 2010) . - pp. 322-328 Mots-clés : Concrete Cracking Thermal analysis Plasticity Strains Load factors. Résumé : Concrete subjected to combined compressive stresses and temperature loading exhibits compressive strains, which are considerably greater than for concrete subjected to compressive stresses alone. This phenomenon is called transient thermal creep or load induced thermal strain and is usually modeled by macroscopic phenomenological constitutive laws which have only limited predictive capabilities. In the present study a mesoscale modeling approach is proposed in which the macroscopically observed transient thermal creep results from the mismatch of thermal expansions of the mesoscale constituents. The mesostructure of concrete is idealized as a two-dimensional three-phase material consisting of aggregates, matrix, and interfacial transition zones. The nonlinear material response of the phases is described by a plasticity interface model. The mesoscale approach was applied to analyze compressed concrete specimens subjected to uniform temperature histories and the analysis results were compared to experimental results reported in the literature. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

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