Buckling of Coped Steel Beams
Publication: Journal of Structural Engineering
Volume 110, Issue 9
Abstract
An approximate energy method for evaluating the buckling capacity of coped beams subjected to concentrated load at the mid‐span has been developed. The method consists of evaluating several trial buckling loads by varying a shape parameter 7. The lowest of the trial loads represents the buckling load. It is shown that the proposed method yields buckling loads which are close to those obtained experimentally. It was found that the reduction in buckling load due to coping can be quite significant depending upon the particular situation. This fact has been ignored by the AISC specification. The standard buckling equations are usually based upon the assumption that the load is acting through the shear center. It was found that the effect of load acting on the top flange (rather than the shear center) is very significant—even for uncoped beams. In coped beams, the effect of mismatched shear centers at the junction of the coped and uncoped part further adds to the same effect. These effects are also ignored by the AISC specification.
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References
1.
American Institute of Steel Construction, Specification for the Design, Fabrication and Erection of Structural Steel for Buildings, Nov., 1978.
2.
Trahair, N. S., and Kitipornchai, S., “Elastic Lateral Buckling of Stepped I‐Beams,” Journal of the Structural Division, ASCE, Vol. 97, No. ST10, Oct., 1971, pp. 2535–2548.
3.
du Plessis, D. P., “Lateral Torsional Buckling of End Notched Steel Beams,” Proceedings, International Colloquium on Stability of Structures under Static and Dynamic Loads, ASCE, Washington, D.C., May, 1977.
4.
Timoshenko, S. P., and Gere, J. M., Theory of Elastic Stability, 2nd ed., McGraw Hill Book Co., Inc., New York, N.Y., 1961.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 110 • Issue 9 • September 1984
Pages: 1977 - 1987
Copyright
Copyright © 1984 ASCE.
History
Published online: Sep 1, 1984
Published in print: Sep 1984
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