Vol. 5, No. 1, pp. 49-71 (2009)
DIRECT STRENGTH PREDICTION OF LIPPED CHANNEL COLUMNS
EXPERIENCING LOCAL-PLATE/DISTORTIONAL INTERACTION
N. Silvestre, D. Camotim * and P.B. Dinis
Department of Civil Engineering and Architecture, ICIST/IST, Technical University of Lisbon, Portugal
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 9 November 2007; Revised: 3 January 2008; Accepted: 7 January 2008
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ABSTRACT
This paper reports an ongoing investigation intended to assess the performance of the Direct Strength Method (DSM) to estimate the ultimate strength of lipped channel columns affected by local-plate/distortional mode interaction. First, the DSM approaches to safety check columns against local-plate and distortional failures are briefly reviewed, with special attention devoted to a recently proposed extension that takes into account the above buckling mode interaction. Next, one presents and discusses the results of a parametric study, carried out by means of the code ABAQUS and involving the evaluation of the “exact” ultimate loads of 63 lipped channel columns with various geometries, all exhibiting local-plate/distortional interaction. Then, these ultimate strength data are compared with the estimates provided by the available DSM formulae and, on the basis of this comparison, one identifies several features that a DSM approach successfully accounting for local-plate/distortional interaction must incorporate.
KEYWORDS
Direct Strength Method (DSM), cold-formed steel, lipped channel columns, strength, local-plate buckling, distortional buckling, local-plate/distortional interaction.
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