Local-distortional interaction in cold-formed steel columns: Non-linear behaviour, ultimate strength and DSM design

D. Camotim, P. B. Dinis, B. Young, N. Silvestre

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

6 Citations (Scopus)

Abstract

This paper provides an overview of the most recent research activity concerning the (i) nonlinear behaviour (elastic and elastic-plastic), (ii) ultimate strength and (iii) Direct Strength Method (DSM) design of cold-formed steel columns experiencing local-distortional (L-D) interaction. After briefly introducing and illustrating this mode coupling phenomenon, both numerical (Abaqus 4-node shell finite element analysis) and experimental results are presented, compared and discussed. The numerical investigation make it possible to characterise the L-D interactive behaviour and failure of columns with different cross-section shapes (lipped channels, hats, zeds and racks) and includes fairly extensive parametric studies, carried out in order to (i) assess how the relevance of the L-D interaction effects varies with the ratios between the competing (local and distortional) critical buckling stresses and the steel yield stress, and (ii) gather a substantial ultimate strength data bank. Then, the experimental tests, dealing with lipped-channel and rack-section columns, provides experimental (i) evidence of the occurrence of clear L-D interaction and (ii) failure loads and collapse mechanisms. Next, after showing the inadequacy of the current DSM local and distortional column strength curves to predict L-D interactive failures, the paper presents and assesses the merits of recently developed DSM-based design procedures against such interactive column failures. Finally, the paper closes with some concluding remarks and a few comments on developments planned for the near-to-intermediate future.

Original languageEnglish
Title of host publicationResearch and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
Pages17-22
Number of pages6
Publication statusPublished - 9 Dec 2013
Externally publishedYes
Event5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013 - Cape Town, South Africa
Duration: 2 Sep 20134 Sep 2013

Publication series

NameResearch and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013

Conference

Conference5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
CountrySouth Africa
CityCape Town
Period2/09/134/09/13

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering

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