Numerical Investigation on the Interaction of Local and Global Buckling in Cold Formed Steel Lipped Channel Columns
M. Anbarasu1, R. Padmavijayan2
1Asst. Prof. M. Anbarasu, Department of Civil Engineering, Government College of Engineering, Salem, Tamilnadu, India.
2Asst. Prof. R. Padmavijayan, Department of Civil Engineering, The Kavery Engineering College, Mecheri, Tamilnadu, India.
Manuscript received on May 28, 2015. | Revised Manuscript received on June 10, 2015. | Manuscript published on June 15, 2015. | PP: 38-42 | Volume-3 Issue-7, June 2015. | Retrieval Number: G0895063715/2015©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This paper reports a numerical investigation concerning the post-buckling behaviour of cold-formed steel lipped channel columns under axial compression affected by the interaction of local and global buckling. Three types of lipped channel cross section profile have been chosen for the study, using CUFSM software by trial and error method to obtain local/global interaction. A non-linear finite element model is developed and verified against the experimental data available in literature on cold-formed steel lipped channel columns. Geometric and material non-linearities are included in the finite element model. Static buckling analysis is carried out and buckling modes such as local and distortional are extracted to incorporate the initial imperfections. After the verification of the finite element model extensive parametric study have been carried out by varying the length and thickness. The finite Element Software ABAQUS is used for the study. The column strengths predicted by the finite element analysis are compared with the design column strengths predicted by DSM – AS100:2007, AS/NZ: 4600- 2005. Based on this study the influence of local/global interaction on ultimate strength are discussed and presented.
Keywords: Columns, Buckling, Local/Global Interaction, Axial compression member etc.