LRFD Criteria for Steel Beam-Columns

by Reidar Bjorhovde, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Alberta, Edmonton, Alberta, Canada,
Mayasandra K. Ravindra, (M.ASCE), Supervisor; Probabilistic Analysis Section, Sargent & Lundy Engrs., Chicago, Ill.,
Theodore V. Galambos, (F.ASCE), Prof. and Chmn.; Dept. of Civ. Engrg., Washington Univ., St. Louis, Mo.,

Serial Information: Journal of the Structural Division, 1978, Vol. 104, Issue 9, Pg. 1371-1387

Document Type: Journal Paper


An intensive investigation of the strength and behavior of steel beam-columns has been carried out with a view towards the development of load and resistance factor design (LRFD) criteria for such members. Since the solution for general beam-column is a very complex problem, thee first part of the paper gives an outline of the deterministic bases for the analysis of beam-columns, considering laterally supported and laterally unsupported members. Major attention is paid to the development of resistance factors for beam-columns, whereby the random nature of their strength is accounted for. Utilizing theoretical and experimental results, it is shown that a beam-column resistance factor of 0.86 may be used for uniaxially loaded members. For biaxially loaded beam-columns the resistance factor may be set at the conservative figure of 0.80, which reflects the scarcity of test results for such members.

Subject Headings: Biaxial loads | Load and resistance factor design | Steel beams | Beam columns | Load tests | Structural strength | Strength of materials

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