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Kotelko M.,Technical University of Dz | Ungureanu V.,Polytechnic University of Timisoara | Ungureanu V.,Romanian Academy of Sciences | Dubina D.,Polytechnic University of Timisoara | And 2 more authors.
Thin-Walled Structures | Year: 2011

The paper presents results of the comparative theoretical study into plastic strength of thin-walled plated structures (plates and columns) using two different approaches: energy method and equilibrium strip method. Two types of members, a thin plate and a channel section column subjected to compression, were under investigation. Numerical results obtained using both methods, together with FE simulation are presented in load-deformation diagrams. Experimental verification of theoretical analysis (using two methods under investigation together with standards strength predictions) focused on stub columns (lipped channel sections) is presented. © 2010 Elsevier Ltd. All rights reserved.

Jedrysiak J.,Technical University of Dz | Michalak B.,Technical University of Dz
Thin-Walled Structures | Year: 2011

A conjunction of local apparent properties with a global design of structural elements is motivation for applying composites, which have space varying effective properties. This contribution deals with analysis of dynamics and stability problems for thin composite plates with a smooth and a slow gradation of macroscopic properties. The formulation of two mathematical models of these plates, based on a tolerance averaging technique, cf. Woźniak et al. [18], is the aim of the paper. The general results are applied to the analysis of some special problems. © 2010 Elsevier Ltd. All rights reserved.

Ungureanu V.,Polytechnic University of Timisoara | Koteko M.,Technical University of Dz | Mania R.J.,Technical University of Dz | Dubina D.,Polytechnic University of Timisoara
Thin-Walled Structures | Year: 2010

Short members of thin-walled cold-formed (TWCF) steel sections, in compression and bending, fail by forming local plastic mechanisms. Taking into account the localised buckling pattern, the collapse of slender members, due to the interaction between local and overall buckling modes, is always characterised by local plastic mechanism failure mode. Based on these two observations, the ultimate strength in interactive buckling of these members can be regarded as an interaction between localised plastic mode and overall elastic one.The yield line mechanism method has been widely used to predict the sectional strength (e.g. local) of thin-walled cold-formed steel members that involve failure mode characterized by local collapse mechanisms. This method can be also used to study post-collapse behaviour and to evaluate the load-carrying capacity, ductility and energy absorption.This paper is based on previous studies and some latest investigations of authors, as well as the literature collected data. It represents an attempt to make an inventory, classify and range geometrical and analytical models for the local-plastic mechanisms aiming to characterize the ultimate capacity of some of the most used cold-formed steel sections in structural applications. © 2010 Elsevier B.V. All rights reserved.

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