Local plastic mechanisms in thin steel plates under in-plane compression

Mahendran, M. (1997) Local plastic mechanisms in thin steel plates under in-plane compression. Thin-Walled Structures, 27(3), pp. 245-261.

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Abstract

Thin-walled steel plates subjected to in-plane compression develop two types of local plastic mechanism, namely the roof-shaped mechanism and the so-called flip-disc mechanism, but the intriguing question of why two mechanisms should develop was not answered until recently. It was considered that the location of first yield point shifted from the centre of the plate to the midpoint of the longitudinal edge depending on the b/t ratio, imperfection level, and yield stress of steel, which then decided the type of mechanism. This paper has verified this hypothesis using analysis and laboratory experiments. An elastic analysis using Galerkin's method to solve Marguerre's equations was first used to determine the first yield point, based on which the local plastic mechanism/imperfection tolerance tables have been developed which give the type of mechanism as a function of b/t ratio, imperfection level and yield stress of steel. Laboratory experiments of thin-walled columns verified the imperfection tolerance tables and thus indirectly the hypothesis. Elastic and rigid-plastic curves were them used to predict the effect on the ultimate load due to the change of mechanism. A finite element analysis of selected cases also confirmed the results from simple analyses and experiments.

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ID Code: 64384
Item Type: Journal Article
Refereed: Yes
Additional Information: Compilation and indexing terms, Copyright 2013 Elsevier Inc.
1997383750355
Galerkin method
Imperfection tolerance tables
In plane compression
Marguerre equations
Plastic mechanisms
Thin steel plate
Yield point
Keywords: Plates (structural components), Columns (structural), Defects, Elasticity, Finite element method, Functions, Loads (forces), Numerical methods, Plasticity, Steel structures, Structural analysis, Yield stress
DOI: 10.1016/S0263-8231(96)00040-7
ISSN: 0263-8231
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 1997 Elsevier Science Ltd
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Thin-Walled Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thin-Walled Structures, Volume 27, Issue 3, (March 1997), DOI: 10.1016/S0263-8231(96)00040-7
Deposited On: 21 Nov 2013 02:15
Last Modified: 11 Feb 2015 02:28

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