Cold-Formed-Steel Oval Hollow Sections under Axial Compression
Publication: Journal of Structural Engineering
Volume 137, Issue 7
Abstract
A test program was performed on cold-formed-steel oval hollow sections under axial compression. The test specimens were cold-rolled into oval hollow sections with flat web plates and semicircular flanges. The test program included a total of 28 column specimens that were separated into four series of different cross-sectional dimensions. Each series involved at least six specimens of different lengths to obtain a column curve. The columns were compressed between fixed ends. The overall geometric imperfections of the column specimens were measured prior to testing. The failure modes of the specimens included flexural buckling, local buckling, material yielding, and interaction between local and overall buckling. Material properties of each series at the flat and curved portions were determined from tensile coupon tests. The current design specifications for cold-formed-steel structures do not cover the design of oval hollow sections. Hence, certain assumptions on the calculation of effective width have been made in this study. The test strengths were compared with the design strengths predicted by the North American, Australian/New Zealand, and European specifications for cold-formed-steel structures. The test strengths were also compared with the design strengths predicted by the American Iron and Steel Institute Specification for automotive steel that includes design rules for local instability of sections with curved and straight elements. A reliability analysis was also performed. It is shown that the design strengths predicted by the three specifications are generally conservative.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The research work described in this paper was supported by the Chinese National Natural Science Foundation (Project No. NNSFC50808126 and NNSFC51078237). The tests were conducted at the Structural Engineering Laboratory, University of Hong Kong. The authors are grateful to Mr. Chun-Fai Leung for his assistance in the experimental program as part of his final-year undergraduate research project at the University of Hong Kong.
References
American Iron and Steel Institute (AISI). (2002). “Automotive steel design manual—Revision 6.1.” Automotive Applications Committee, Southfield, MI.
American Iron and Steel Institute (AISI). (2007a). Commentary on North American specification for the design of cold-formed steel structural members. Washington, DC.
American Iron and Steel Institute (AISI). (2007b). North American specification for the design of cold-formed steel structural members. Washington, DC.
ASTM. (1997). “Standard test methods for tension testing of metallic materials.” E8M-97, West Conshohocken, PA.
Australian and New Zealand Standard (AS/NZS). (2005). “Cold-formed steel structures.” AS/NZS No. 4600:2005, Sydney, Australia.
Bortolotti, E., Jaspart, J. P., Pietrapertosa, C., Nicaud, G., Petitjean, P. D., and Grimault, J. P. (2003). “Testing and modelling of welded joints between elliptical hollow sections.” Tubular structures X: Proc., 10th Int. Symp. on Tubular Structures, Taylor and Francis, Oxford, UK, 259–266.
Chan, T. M., and Gardner, L. (2008). “Bending strength of hot-rolled elliptical hollow sections.” J. Constr. Steel Res., 64(9), 971–986.
Chan, T. M., and Gardner, L. (2009). “Flexural buckling of elliptical hollow section columns.” J. Struct. Eng., 135(5), 546–557.
European Committee for Standardization (CEN). (2005). “Design of steel structures, part 1.1: General rules and rules for buildings.” EN 1993-1-1:2005, Eurocode 3, Brussels, Belgium.
European Committee for Standardization (CEN). (2006a). “Design of steel structures, part 1.3: General rules—Supplementary rules for cold-formed members and sheeting.” EN 1993-1-3:2006, Eurocode 3, Brussels, Belgium.
European Committee for Standardization (CEN). (2006b). “Design of steel structures, part 1.5: Plated structural elements.” EN 1993-1-5:2006, Eurocode 3, Brussels, Belgium.
Gardner, L., and Chan, T. M. (2007). “Cross-section classification of elliptical hollow sections.” Steel Compos. Struct., 7(3), 185–200.
Gardner, L., and Ministro, A. (2005). “Structural steel oval hollow sections.” Structural Eng., 83(21), 32–36.
Standards Association of Australia (SAA). (1991). “Methods for tensile testing of metals.” AS 1391-1991, North Sydney, Australia.
Theofanous, M., Chan, T. M., and Gardner, L. (2009). “Structural response of stainless steel oval hollow section compression members.” Eng. Struct., 31(4), 922–934.
Yang, H., Lam, D., and Gardner, L. (2008). “Testing and analysis of concrete-filled elliptical hollow sections.” Eng. Struct., 30(12), 3771–3781.
Young, B., and Rasmussen, K. J. R. (1998). “Design of lipped channel columns.” J. Struct. Eng., 124(2), 140–148.
Zhao, X. L., and Packer, J. A. (2009). “Tests and design of concrete-filled elliptical hollow section stub columns.” Thin-Walled Struct., 47(6), 617–628.
Zhu, J. H., and Young, B. (2006). “Tests and design of aluminum alloy compression members.” J. Struct. Eng., 132(7), 1096–1107.
Zhu, J. H., and Young, B. (2009). “Design of aluminum alloy flexural members using direct strength method.” J. Struct. Eng., 135(5), 558–566.
Information & Authors
Information
Published In
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 7, 2010
Accepted: Sep 24, 2010
Published online: Oct 21, 2010
Published in print: Jul 1, 2011
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.