Bending and Torsion of Cold-Formed Channel Beams
Publication: Journal of Structural Engineering
Volume 125, Issue 5
Abstract
This paper reports the results of 34 bending and torsion tests on unbraced simply supported cold-formed steel channel beams loaded eccentrically at midspan. These results and those of 10 concentrically loaded beams are compared with analytical predictions and with simple design approximations. The tests show that the beam strengths decrease as the load eccentricity increases and that the strength is higher when the load acts on the centroid side of the shear center than when it acts on the side away from the shear center. Good agreement is demonstrated between the test results and analytical predictions of the strengths. An extended series of analytical predictions is used to develop simple interaction equations that can be used in the design of eccentrically loaded cold-formed channel beams.
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References
1.
Baigent, A. H., and Hancock, G. J. ( 1980). “The behaviour of portal frames composed of cold-formed members.” Thin-Walled Structures, J. R. Rhodes and A. C. Walker, eds., Granada Publishing, London, 209–222.
2.
Baigent, A. H., and Hancock, G. J. ( 1982). “Structural analysis of assemblages of thin-walled members.” Engrg. Struct., 4(3), 207–216.
3.
Celebi, N., Winter, G., and Pekoz, T. ( 1971). “Diaphragm braced channel and z-section beams.” Rep. No. 344, Dept. of Struct. Engrg., Cornell University, Ithaca, N.Y.
4.
Ellifritt, D. S., Sputo, T., and Haynes, J. R. ( 1991). “Flexural strength and deflections of discretely braced cold formed steel channel and Zee sections.” Rep. Prepared for American Iron and Steel Institute, University of Florida.
5.
Ellifritt, D. S., Sputo, T., and Haynes, J. R. ( 1992). “Flexural capacity of discretely braced C's and Z's.” Proc., 11th Int. Spec. Conf. on Cold-Formed Steel Struct., University of Missouri-Rolla, 102–129.
6.
Hancock, G. J., and Papangelis, J. P. ( 1997). THIN-WALL user's manual. Ctr. for Advanced Struct. Engrg., University of Sydney, Sydney, Australia.
7.
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.
8.
Linder, J., and Kurth, W. ( 1979). “Beigedrillknickversuche an Querbelasteten Walz tragern.” Bauingenieur, Germany, 53(10), 373–377 (in German).
9.
Pi, Y.-L., Put, B. M., and Trahair, N. S. ( 1997). “Lateral buckling strengths of cold-formed channel section beams.” Res. Rep. R748, Dept. of Civ. Engrg., University of Sydney, Sydney, Australia.
10.
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.
11.
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.
12.
Pi, Y.-L., and Trahair, N. S. (1994c). “Inelastic bending and torsion of steel I-beams.”J. Struct. Engrg., ASCE, 120(12), 3397–3417.
13.
Pi, Y.-L., and Trahair, N. S. (1995). “Plastic collapse analysis of torsion.”J. Struct. Engrg., ASCE, 121(10), 1389–1395.
14.
Put, B. M., Pi, Y.-L., and Trahair, N. S. ( 1998). “Lateral-buckling tests on cold-formed channel beams.” Res. Rep. 767, Dept. of Civ. Engrg., University of Sydney, Sydney, Australia.
15.
Trahair, N. S. (1999). “Plastic torsion analysis of mono- and point-symmetric beams.”J. Struct. Engrg., ASCE, 125(2), 175–182.
16.
Trahair, N. S., and Bradford, M. A. ( 1998). The behaviour and design of steel structures to AS4100, 3rd Australian Ed., E and FN Spon, London.
17.
Trahair, N. S., and Pi, Y.-L. ( 1996). “Simplified torsion design of compact I-beams.” Steel Constr., Sydney, Australia, 30(1), 2–19.
18.
Winter, G., Lansing, W., and McCalley Jr., R. B. ( 1949). “Performance of laterally loaded channel beams.” Proc., Symp. on Engrg. Struct., Colston Research Society, U.K., 49–60.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 125 • Issue 5 • May 1999
Pages: 540 - 546
History
Received: Aug 14, 1998
Published online: May 1, 1999
Published in print: May 1999
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