On the effect of the local overall interaction on the postbuckling of uniformly compressed channels

Marcello Pignataro (1) , Angelo Luongo (2) , Nicola Rizzi (3)

1 DISG - Dipartimento di Ingegneria Strutturale e Geotecnica
2 DICEAA - Dipartimento di Ingegneria Civile, Edile-Architettura, Ambientale
3 Dipartimento di Architettura

On the basis of the general theory of elastic stability due to Koiter, postbuckling analysis of simply supported channels under uniform compression is performed. Attention is essentially focused on local/eularian and local/flexural-torsional simultaneous bucklin modes interaction. The column is treated as a plate assemblage. Linearized expressions for the displacement field are employed while assuming strain-displacements relationships that are linear for the curvatures and up to second order terms for the in-plane strains. The total potential energy is hence written up to third order terms in order to investigate asymmetric buckling phenomena. A discrete model is developed through an automatic procedure of algebraic manipulation, and an extensive parametric analysis is performed. After determining the range of geometric parameters which characterize different types of interaction, it is found that in the postbuckling range the local/eulerian interaction is more dangerous than the local/flexural-torsional one, due to the column higher imperfection sensitivity.

Domaines: Autre

Marcello Pignataro, Angelo Luongo, Nicola Rizzi. On the effect of the local overall interaction on the postbuckling of uniformly compressed channels. Thin-Walled Structures, 1985, 3 (4), pp.293-321. ⟨hal-00788743⟩