Stiffener Effects on Torsional Buckling of Columns
Publication: Journal of Structural Engineering
Volume 109, Issue 3
Abstract
Torsional stability of centrally loaded columns, having doubly symmetric sections, often is critical. The torsional stability can be improved by locally placed plates connecting the different flanges of the column partially preventing the section to warp and thus, improving the contribution of warping to the stability resistance. The warping restraint stiffness is used in the determination of the transitional conditions at the stiffeners. These together with the boundary conditions and the linear, homogeneous differential equations formulates the eigenvalue problem. The eigenvalue problem is solved in two ways: (1) One locally placed stiffener and; (2) two locally placed stiffeners arranged symmetric with respect to the column mid span. The solutions are shown in graphs which may be used as design charts. From these graphs it can be seen that the optimal position of the stiffener is about 1/5 or 1/6 of the span for one or two stiffeners. The maximum obtainable increase of the buckling load depends of the proportion of the warping resistance to the torsional resistance. These are presented in graphs.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Goodier, J. N., “The Buckling of Compressed Bars by Torsion and Flexure,” Bulletin 27, Engineering Experiment Station, Cornell University, Ithaca, N.Y., Dec., 1941.
2.
Lenz, J., and Vielsack, P., “Eine Kritische Bemerkung zur Theorie des Drillknickens,” Der Stahlbau, No. 8, 1980, p. 245.
3.
Nylander, H., “Drehungsvorgänge und gebundene Kippung bei geraden dobbeltsymmetrischen I‐trägern. Ingenjörvetenskapsakademiens Handlinger,” nr. 174, Stockholm, Sweden, 1943.
4.
Ojalvo, M., “Wagner Hypotesis in Beams and Column Theory,” Journal of the Engineering Mechanics Division, Vol. 107, No. EM4, Aug., 1981, pp. 669–667.
5.
Timoshenko, S. P., and Gere, J. M., Theory of Elastic Stability, 2nd ed., Yogakusha Company, Ltd., Tokyo, Japan, 1961.
6.
Vacharajittiphan, P., and Trahair, N. S., “Warping and Distortion at I‐Section Joints,” Journal of the Structural Division, Vol. 100, No. ST3, Mar., 1974, pp. 547–564.
7.
Vlasov, V. Z., “Thin‐Walled Elastic Beams,” Israel Program for Scientific Translations, Jerusalem, Israel, 1961.
8.
Wagner, H., Nerdrehung und Knickung von offenen Profilen, 25th Anniversary Publication, Technische Hochschule, Danzig, Poland, 1936, pp. 1904–1929.
Information & Authors
Information
Published In
Copyright
Copyright © 1983 ASCE.
History
Published online: Mar 1, 1983
Published in print: Mar 1983
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.