# Calculation of Critical Load for Pure Distortional Buckling of Lipped Channel Columns

## Authors

• Imene Mahi
Affiliation

Department of Civil Engineering, Faculty of technology, University of Tlemcen

• Mohamed Djelil
Affiliation

Department of Civil Engineering, Faculty of Technology, RISAM Laboratory, University of Tlemcen

• Naoual Djafour
Affiliation

Department of Civil Engineering, Faculty of Technology, RISAM Laboratory, University of Tlemcen

• Mustapha Djafour
Affiliation

Department of Civil Engineering, Faculty of Technology, RISAM Laboratory, University of Tlemcen

## Abstract

This paper presents a method that allows calculating the elastic critical stress for the distortional buckling mode, based on the buckling mode classification of typical lipped channel columns. In our case, Cold-Formed Steel Lipped Channel Columns are subjected to compression. Moreover, in order to consolidate the important findings of this work, a comparative study was carried out to assess the reliability of various distortional buckling models that are provided by different design Standards. It was found that the American and Australian approaches, given in the codes of practice, are closer to the Finite Strip Method than to the European method. An analytical solution was proposed for the determination of the distortional buckling stress on the basis of a statistical method; it corresponds to lipped channel sections with a flange width to web width ratio b/h ranging from 0.1 to 1, and a lip width to web width ratio c/h between 0 and 0.5. After comparison with the results given by the finite strip method for pure distortional buckling, it turned out that the proposed approach provides a reasonable prediction for the elastic distortional buckling stress for lipped channel sections subjected to compression. In fact, this method gives better results than the American approach.

## Keywords:

distortional buckling; lipped channel; analytical solution; compression; finite strip method

2019-10-09

## How to Cite

Mahi, I., Djelil, M., Djafour, N., Djafour, M. “Calculation of Critical Load for Pure Distortional Buckling of Lipped Channel Columns”, Periodica Polytechnica Civil Engineering, 63(4), pp. 1016–1029, 2019. https://doi.org/10.3311/PPci.13244

Research Article