Lateral Buckling Strengths of Cold-Formed Channel Section Beams
Publication: Journal of Structural Engineering
Volume 124, Issue 10
Abstract
This paper is concerned with the inelastic lateral buckling strengths of cold-formed channel section (CFC) beams. Code rules for designing steel beams against lateral buckling that are based on data for hot-rolled I-section beams may be unsuitable for CFC beams because they have different stress-strain curves, residual stresses, and initial imperfections. Distortion may reduce the resistance of a CFC beam to lateral buckling. In addition, due to the monosymmetry of the cross section, the effective shear center moves toward the web and the effective section becomes asymmetrical after yielding, so that a CFC beam under major axis bending is subjected to minor axis bending and twisting. Also, the minor axis bending and warping strain distributions and therefore the strengths of CFC beams are related to the twist rotation and minor axis deflection directions. This paper deals with these problems by developing an advanced finite-element model to investigate the elastic lateral-distortional buckling, inelastic behavior, and strengths of CFC beams with residual stresses and initial imperfections. The results are used to develop improved design rules for CFC beams. The effects of moment distribution and load height on the strengths are also studied.
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References
1.
Bradford, M. A. (1992). “Lateral-distortional buckling of steel I-section members.”J. Constructional Steel Res., 23(1–3), 97–116.
2.
“Cold-formed steel structures.” (1996). AS/NZS4600-1996, Standards Australia, Homebush, Australia, and Wellington, New Zealand.
3.
Djugash, A. C. R., and Kalyanaraman, V. (1990). “Experimental study on the lateral buckling behaviour of cold-formed beams.”Proc., 10th Int. Spec. Conf. on Cold-Formed Steel Struct., University of Missouri at Rolla, Mo., 363–380.
4.
Djugash, A. C. R., and Kalyanaraman, V. (1994). “Nonlinear analysis of thin-walled member under biaxial bending.”J. Constructional Steel Res., 31(2–3), 289–304.
5.
Ellifritt, D. S., Sputo, T., and Haynes, J. R. (1992). “Flexural strength and deflections of discretely braced cold formed steel channel and Zee sections.”Proc., 11th Int. Spec. Conf. on Cold-Formed Steel Struct., University of Missouri at Rolla, Mo., 109–129.
6.
Galambos, T. V., ed. (1988). Guide to stability design criteria for metal structures, 4th Ed., John Wiley & Sons, Inc., New York.
7.
Hancock, G. J.(1997). “Design for distortional buckling of flexural members.”Thin-Walled Struct., 27(1), 3–12.
8.
Hancock, G. J., and Papangelis, J. P. (1997). THIN-WALL user's manual. Centre for Advanced Structural Engineering, University of Sydney, Sydney, Australia.
9.
Hill, H. N.(1954). “Lateral buckling of channels and Z-beams.”Trans. ASCE, 119, 829–841.
10.
Kavanagh, K. T., and Ellifritt, D. S.(1994). “Design strengths of cold-formed channels in bending and torsion.”J. Struct. Engrg., ASCE, 120(5), 1599–1607.
11.
Key, P. W., and Hancock, G. J.(1993). “A theoretical investigation of the column behaviour of cold-formed square hollow sections.”Thin-Walled Struct., 16(1), 31–64.
12.
Kwon, Y. B. (1992). “Post-buckling behaviour of thin-walled channel sections,” PhD thesis, University of Sydney, Sydney, Australia.
13.
Lindner, J., and Aschinger, R. (1994). “Load-carrying capacity of cold-formed beams subjected to overall lateral-torsional buckling and local plate buckling.”J. Constructional Steel Res., 31(2–3), 267–287.
14.
Pi, Y.-L., Put, B. M., and Trahair, N. S. (1997). “Lateral buckling strengths of cold-formed channel section beams.”Res. Rep. No. R748, Ctr. for Advanced Struct. Engrg., Dept. of Civ. Engrg., University of Sydney, Sydney, Australia.
15.
Pi, Y.-L., and Trahair, N. S.(1992a). “Prebuckling deflections and lateral buckling. I: Theory.”J. Struct. Engrg., ASCE, 118(11), 2949–2966.
16.
Pi, Y.-L., and Trahair, N. S.(1992b). “Prebuckling deflections and lateral buckling. II: Applications.”J. Struct. Engrg., ASCE, 118(11), 2967–2985.
17.
Pi, Y.-L., and Trahair, N. S.(1994a). “Nonlinear inelastic analysis of steel beam-columns. I: Theory.”J. Struct. Engrg., ASCE, 120(7), 2041–2061.
18.
Pi, Y.-L., and Trahair, N. S.(1994b). “Nonlinear inelastic analysis of steel beam-columns. II: Applications.”J. Struct. Engrg., ASCE, 120(7), 2062–2085.
19.
Pi, Y.-L., and Trahair, N. S.(1995). “Lateral buckling strengths of cold-formed rectangular hollow sections.”Thin-Walled Struct., 22(2), 71–95.
20.
Pi, Y.-L., and Trahair, N. S.(1997). “Lateral-distortional buckling strengths of cold-formed HFBs.”J. Struct. Engrg., ASCE, 123(6), 695–702.
21.
Put, B. M., Pi, Y.-L., and Trahair, N. S. (1998). “Lateral buckling tests on cold-formed channel section beams.”Res. Rep., Ctr. for Advanced Struct. Engrg., Dept. of Civ. Engrg., University of Sydney, Sydney, Australia.
22.
Rogers, C. A., and Schuster, R. M.(1997). “Flange/web distortional buckling of cold-formed sections in bending.”Thin-Walled Struct., 27(1), 13–29.
23.
Rousch, C. J., Rasmussen, K. J. R., and Hancock, G. J. (1993). “Bending strengths of cold-formed channel and Z-sections restrained by sheeting.”Proc., Int. Workshop on Cold-Formed Steel Struct., Ctr. for Advanced Struct. Engrg., University of Sydney, Sydney, Australia.
24.
Schafer, B., Grigoriu, M., and Peköz, T. (1996). “A probabilistic examination of the ultimate strength of cold-formed steel elements.”Proc., 13th Int. Spec. Conf. on the Cold-Formed Steel Struct., University of Missouri at Rolla, Mo., 65–80. Specification for the design of cold-formed steel structural members. (1996). American Iron and Steel Institute, Washington, D.C.
25.
“Steel structures.” (1990). AS4100-1990, Standards Australia, Homebush, Australia.
26.
Trahair, N. S. (1993). Flexural-torsional buckling of structures. E & FN Spon, London, U.K.
27.
Trahair, N. S.(1994). “Lateral buckling strengths of unsheeted cold-formed beams.”Engrg. Struct., 16(5), 324–331.
28.
Trahair, N. S., and Bradford, M. A. (1998). The behavior and design of steel structures. 3rd Australian Ed., E & FN Spon, London, U.K.
29.
Vlasov, V. Z. (1961). Thin-walled elastic beams, 2nd Ed., Israel Program for Scientific Translation, Jerusalem, Israel.
30.
Weng, C. C., and Peköz, T.(1988). “Residual stresses in cold-formed steel members.”J. Struct. Engrg., ASCE, 116(6), 1611–1625.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 10 • October 1998
Pages: 1182 - 1191
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Oct 1, 1998
Published in print: Oct 1998
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