TECHNICAL NOTES
Mar 1, 1991
Practical Significance of LRFD Beam Buckling Factors
Publication: Journal of Structural Engineering
Volume 117, Issue 3
Abstract
The load and resistance factor design (LRFD) specification introduces two parameters, denoted , and , which are a confusing conglomeration of material and section properties. These two parameters can be approximated by a simple function of flange thickness and section depth, which allows for a clearer interpretation of these two terms. It is shown that these two yerms describe the relative bending efficiency of a W-shape; as decreases and increases, bending efficiency increases. The approximations for and lead to a simplifying approximation for the rather complicated LRFD equation for the elastic lateral-torsional buckling moment of a standard W-shape. A family of curves based on approximate equations for nominal bending stress as a function of is plotted. These curves can be used to compute an approximation for nominal bending moment for a given W-shape.
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References
1.
Specifications for structural steel buildings, load and resistance factor design. (1986). American Institute of Steel Construction, Inc., Chicago, Ill.
2.
Salmon, C. G., and Johnson, J. E. (1980). Steel structures: Design and behavior, Second Ed., Harper & Row Publishers, New York, N.Y.
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Copyright © 1991 ASCE.
History
Published online: Mar 1, 1991
Published in print: Mar 1991
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Peter W. Hoadley, Associate Member, ASCE
Asst. Prof., Dept. of Civ. Engrg., The Virginia Military Inst., Lexington, VA, 24450
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.