Lateral Stability of Beams on Seats
Publication: Journal of Structural Engineering
Volume 109, Issue 9
Abstract
The effect of web distortion on the lateral buckling of I-beams whose top flanges are unrestrained at seat supports is studied by using a finite element method. The theoretical predictions are shown to agree well with available experimental results. The results of the study are used to evaluate present design code approximations, which are found to be unconservative for short length beams, and over-safe for long length beams. An improved approximation is suggested for beams in uniform bending which buckle in a symmetric mode.
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References
1.
AS1250‐1981 Steel Structures Code, Standards Association of Australia, Sydney, Australia, 1981.
2.
B/20 Draft Specification for the Use of Structural Steel in Buidlings, British Standards Institution, London, England, 1977.
3.
Bartels, D., and Bos, C. A. M., “Investigation of the Boundary Conditions on the Lateral Buckling Phenomenon, Taking Account of Cross‐Sectional Deformation,” Heron, Vol. 19, No. 1, 1973, p. 1.
4.
Bradford, M. A., and Trahair, N. S., “Distortional Buckling of I‐Beams,” Journal of the Structural Division, ASCE, Vol. 107, No. ST2, Proc. Paper 16057, Feb., 1981, pp. 355–370.
5.
BS449: 1969 Specification for the Use of Structural Steel in Buildings, British Standards Institution, London, England, 1969.
6.
Hancock, G. J., Bradford, M. A., and Trahair, N. S., “Web Distortion and Flexural‐Torsional Buckling,” Journal of the Structural Division, ASCE, Vol. 106, No. ST7, Proc. Paper 15539, July, 1980, pp. 1557–1571.
7.
Holmes, M., Astill, A. W., and Martin, L. H., “Web Buckling of Rolled Steel Beams,” Technical Note 102, Construction Industry Research and Information Association, Nov., 1980, p. 1.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 109 • Issue 9 • September 1983
Pages: 2212 - 2215
Copyright
Copyright © 1983 ASCE.
History
Published online: Sep 1, 1983
Published in print: Sep 1983
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