Comptes Rendus
Une approche de plasticité au gradient en construction métallique
[A gradient plasticity approach for steel structures]
Comptes Rendus. Mécanique, Volume 331 (2003) no. 9, pp. 647-654.

Local buckling of steel structural members has to be well understood in order to design accurately steel structures in seismic areas. Induced softening moment-curvature law leads to a well known ill-posedness elastoplastic evolution problem. Localization is chosen to be controlled with a gradient plasticity approach. The concept of cross-section behavioural classes, classically adopted in modern rule design, should be substituted by the concept of member behavioural classes.

Le comportement au voilement d'éléments poutres en acier est important à comprendre dans le dimensionnement des ossatures métalliques soumises à un séisme. Le radoucissement induit au niveau de la loi moment-courbure conduit à un problème d'évolution élastoplastique mal posé. Un modèle de plasticité au gradient est proposé pour contrôler la localisation. La classification des sections classiquement proposée par les règlements en est remise en cause. Une classification par éléments serait probablement plus adaptée.

Received:
Accepted:
Published online:
DOI: 10.1016/S1631-0721(03)00141-4
Mot clés : Solides et structures, Structures en acier, Voilement, Plasticité au gradient, Comportement au séisme, Localisation
Keywords: Solids and structures, Steel structures, Local buckling, Gradient plasticity, Seismic behavior, Localization

Noël Challamel 1

1 Laboratoire de mécanique des structures et matériaux, INSA de Rennes, 20, avenue des Buttes de Coësmes, 35043 Rennes cedex, France
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Noël Challamel. Une approche de plasticité au gradient en construction métallique. Comptes Rendus. Mécanique, Volume 331 (2003) no. 9, pp. 647-654. doi : 10.1016/S1631-0721(03)00141-4. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(03)00141-4/

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