Cold-Formed Steel Lipped Channel Columns Influenced by Local-Distortional Interaction: Strength and DSM Design
Publication: Journal of Structural Engineering
Volume 139, Issue 6
Abstract
This paper deals with the ultimate strength and design of fixed-ended lipped channel columns experiencing local-distortional buckling mode interaction. First, the paper reports the results of an experimental investigation involving a set of 26 columns with several cross-section dimensions and yield stresses that were tested to determine their failure loads and also to provide experimental evidence of the occurrence of local-distortional mode interaction. These results consist of the column geometries, material properties, initial geometric imperfections, nonlinear equilibrium paths, and ultimate strength values. Then, after comparing the experimental column ultimate loads with the estimates provided by the current direct strength method (DSM) design curves against local and distortional failures, which clearly show that they lead to inaccurate and often very unsafe ultimate strength estimates, the paper presents and assesses the quality of DSM-based design procedures based on approaches providing nominal strengths against local-distortional and distortional-local interactive failures. Next, an in-depth comparison is made between all the experimental ultimate strength results available in the literature and their estimates provided by the preceding DSM design procedures. Finally, the paper closes with design considerations and recommendations, motivated by the conclusions drawn from this investigation.
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Acknowledgments
The writers are indebted to BlueScope Lysaght (Singapore) Pte. Ltd., for having supplied the cold-formed steel test specimens and thank Mr. Chi-Wai Choy and Mr. Tsz-Kai So for their assistance in the performance of the experimental program at the University of Hong Kong. B. Young gratefully acknowledges the financial support by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. HKU719711E). N. Silvestre and D. Camotim gratefully acknowledge the financial support of FCT (Portuguese Foundation for Science and Technology) through the research project “Generalised Beam Theory (GBT)—Development, Application and Dissemination” (PTDC/ECM/108146/2008).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 6 • June 2013
Pages: 1059 - 1074
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 12, 2012
Accepted: Jul 26, 2012
Published online: Aug 11, 2012
Published in print: Jun 1, 2013
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