Elastic Buckling of Laterally Continuous I-Beams

by Peter F. Dux, Lect. in Civ. Engrg.; Capriconia Inst. of Advanced Education, Rockhampton, Qld., Australia,
Sritawat Kitipornchai, (M.ASCE), Sr. Lect. in Civ. Engrg.; Univ. of Queensland, Qld., Australia,

Serial Information: Journal of the Structural Division, 1982, Vol. 108, Issue 9, Pg. 2099-2116

Document Type: Journal Paper


An approximate method for determining the elastic flexural-torsional buckling loads of laterally continuous structures is developed. The method can be applied to structures loaded at braced points. The braces and supports are assumed to prevent lateral deflection and twisting. The procedure locates a critical segment and adjacent restraining segments which together form a subassemblage. The elastic critical load is obtained by determining the effective length of the critical segment. Charts of effective length factors are presented and the factors are shown to depend on the amount of end restraint and on the critical segment beam parameter and end moment ratio. The proposed method is applied to a worked example. The result, along with other results presented in the paper, is in close agreement with accurate numerical solutions.

Subject Headings: Critical loads | Continuous structures | Elastic analysis | Buckling | I beams | Lateral loads | Bracing | Effective length

Services: Buy this book/Buy this article


Return to search