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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
Edited by: B.H.V. Topping and P. Iványi
Paper 127

Probabilistic Capacity Estimation of Cold-Formed Steel Channel Sections with Type-1 Imperfections

H.S.S. Ahmed, A. Sable and S. Ghosh

Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, India

Full Bibliographic Reference for this paper
H.S.S. Ahmed, A. Sable, S. Ghosh, "Probabilistic Capacity Estimation of Cold-Formed Steel Channel Sections with Type-1 Imperfections", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 127, 2014. doi:10.4203/ccp.106.127
Keywords: cold-formed steel, imperfection, statistics, unlipped, channel, strength curve..

The force carrying capacity of cold-formed steel (CFS) sections depends on the shape achieved through the cold-forming process. Slight deviations from the target shape may affect a CFS section's capacity in a significant way. Local geometric imperfections result in a reduction in the flexural capacity of a CFS member. The work, described in this paper, focuses on the effect of Type-1 local geometric imperfections on the elastic flexural buckling strength of an unlipped channel section. Data available for such imperfections are used to statistically characterise it. Using a Monte Carlo simulation based framework and nonlinear finite element analysis, the statistics of elastic flexural buckling strength of an imperfect member is obtained for a range of nondimensional slenderness ratios (0.75 to 2.0). The imperfection is observed to reduce the flexural strength of the member significantly. This reduction increases with the increasing slenderness. At the recommended design level, a 20.8% reduction is observed at a non-dimensional slenderness of 2.0.

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