Design of Cold-Formed Steel Built-Up Closed Sections with Intermediate Stiffeners
Publication: Journal of Structural Engineering
Volume 134, Issue 5
Abstract
A series of column tests on cold-formed steel built-up closed sections with intermediate stiffeners is presented in this paper. The test specimens were first brake pressed from structural steel sheets to form open sections with intermediate web stiffeners, then two of the open sections were connected at their flanges using self-tapping screws to form the built-up closed sections. The high strength structural steel sheets had the measured 0.2% proof stress up to . Initial and overall geometric imperfections as well as material properties and residual stresses of the test specimens were measured. Tests were performed over a range of lengths such that column curves could be obtained. The test strengths are compared with the design strengths calculated using the direct strength method in the North American Specification and Australian/New Zealand Standard for cold-formed steel structures. Three different methods were used to obtain the local and distortional buckling stresses for the calculation of the direct strength method. Reliability analysis was performed to assess the reliability of the direct strength method on cold-formed steel built-up closed section columns. It is shown that the direct strength method using single section to obtain the buckling stresses is generally conservative.
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Acknowledgments
The writers are grateful to BlueScope Lysaght (Singapore) Pte. Ltd. for supplying the test specimens. The research work described in this paper was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. UNSPECIFIEDHKU6106/04E).
References
AS/NZS. (2005). “Cold-formed steel structures.” AS/NZS No. 4600:2005, Australian/New Zealand Standard, Standards Australia, Sydney, Australia.
ASCE. (2006). “Minimum design loads for buildings and other structures.” ASCE/SEI 7-05, Reston, Va.
Australian Standard (AS). (1991). “Methods for tensile testing of metals.” AS 1391, Standards Association of Australia, Sydney, Australia.
Australian Standard (AS). (1993). “Steel sheet and strip—Hot-dipped zinc-coated or aluminium/zinc-coated.” AS 1397, Standards Association of Australia, Sydney, Australia.
Batista, E., Rondal, J., and Maquoi, R. (1987). “Column stability of cold-formed U and C sections.” Proc., Int. Conf. on Steel and Aluminium Structures, Cardiff, U.K., 419–427.
Denston, R. J., and White, J. D. (1977). “An electrical demountable extensometer.” CUED Technical Report No. CUED/C-Struct/TR.61.
DeWolf, J. T., Peköz, T., and Winter, G. (1974). “Local and overall buckling of cold-formed members.” J. Struct. Div., 100(10), 2017–2036.
Hancock, G. J. (1998). Design of cold-formed steel structures (To Australian/New Zealand Standard AS/NZS 4600:1996), 3rd Ed., Australian Institute of Steel Construction, Sydney, Australia.
Klöppel, K., and Bilstein, W. (1976). “Untersuchungen zur linearen und nichtlinearen Beultheorie mit Beulwerttafeln fur dunnwandige U, C- und Hut-Profile und Tafeln fur mitwirkende Breiten und Tragspannungen von dreiseitig und vierseitig gelenkig gelagerten Reckteckplatten nach der nichtlinearen Beultheorie.” Stahlbau, 45(2), 33–38.
Kwon, Y. B., and Hancock, G. J. (1992). “Tests of cold-formed channels with local and distortional buckling.” J. Struct. Eng., 118(7), 1786–1803.
Lau, S. C.W., and Hancock, G. J. (1988). “Strength tests and design methods for cold-formed channel columns undergoing distortional buckling.” Research Rep. No. R579, School of Civil and Mining Engineering, Univ. of Sydney, Australia.
Mulligan, G. P., and Peköz, T. (1984). “Locally buckled thin-walled columns.” J. Struct. Eng., 110(11), 2635–2654.
NAS. (2001). North American specification for the design of cold-formed steel structural members, American Iron and Steel Institute, Washington, D.C.
NAS. (2004). Supplement 2004 to the North American specification for the design of cold-formed steel structural members, American Iron and Steel Institute, Washington, D.C.
Papangelis, J. P., and Hancock, G. J. (1995). “Computer analysis of thin-walled structural members.” Comput. Struct., 56(1), 157–176.
Peköz, T. B., and Hall, W. B. (1988). “Probabilistic evaluation of test results.” Proc., 9th Int. Specialty Conf. on Cold-Formed Steel Structures, Univ. of Missouri-Rolla, Rolla, Mo.
Rhodes, J., and Harvey, J. M. (1977). “Interaction behaviour of plain channel columns under concentric or eccentric loading.” Proc. 2nd Int. Colloquium on the Stability of Steel Structures, ECCS, Liege, Belgium, 439–444.
Rhodes, J., and Loughlan, J. (1980). “Simple design analysis of lipped channel columns.” Proc., 5th Int. Specialty Conf. on Cold-formed Steel Structures, St. Louis, 241–262.
Schafer, B. W. (2002). “Local, distortional, and Euler buckling of thin-walled columns.” J. Struct. Eng., 128(3), 289–299.
Schafer, B. W., and Peköz, T. (1998). “Direct strength prediction of cold-formed steel members using numerical elastic buckling solutions.” Proc., 14th Int. Specialty Conf. on Cold-Formed Steel Structures, Univ. of Missouri-Rolla, Rolla, Mo., 69–76.
Thomasson, P. O. (1978). “Thin-walled C-shaped panels in axial compression.” Document D1:1978, Swedish Council for Building Research, Stockholm, Sweden.
Weng, C. C., and Peköz, T. (1990). “Compression tests of cold-formed steel columns.” J. Struct. Eng., 116(5), 1230–1246.
Yan, J., and Young, B. (2002). “Column tests of cold-formed steel channels with complex stiffeners.” J. Struct. Eng., 128(6), 737–745.
Young, B. (2005). “Experimental investigation of cold-formed steel lipped angle concentrically loaded compression members.” J. Struct. Eng., 131(9), 1390–1396.
Young, B., and Rasmussen, K. J. R. (1998). “Design of lipped channel columns.” J. Struct. Eng., 124(2), 140–148.
Yu, W. W. (2000). Cold-formed steel design, 3rd Ed., Wiley, New York.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 5 • May 2008
Pages: 727 - 737
Copyright
© 2008 ASCE.
History
Received: Dec 29, 2006
Accepted: Nov 5, 2007
Published online: May 1, 2008
Published in print: May 2008
Notes
Note. Associate Editor: Benjamin W. Schafer
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