Buckling Properties of Monosymmetric I-Beams

by Sritawat Kitipornchai, (M.ASCE), Sr. Lect. in Civ. Engrg.; Univ. of Queensland, Queensland, Australia,
Nicholas S. Trahair, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Sydney, New South Wales, Australia,

Serial Information: Journal of the Structural Division, 1980, Vol. 106, Issue 5, Pg. 941-957

Document Type: Journal Paper


Approximations are derived for the section properties required for the calculation of the elastic critical loads of monosymmetric I-beams and are found to be related to the ratio of compression flange and section minor axis second moments of area. Approximations are obtained that are applicable to I-sections with unequal and lipped flanges and that are in close agreement with accurate calculations of the monosymmetry section properties made for a wide range of cross sections. An improved design rule is proposed for the elastic critical stress of a monosymmetric I-beam. A comparison is made of the results obtained using the proposed rule and the present rules of the AS 1250, BS 449, and AISC Specification.

Subject Headings: Buckling | I beams | Approximation methods | Elastic analysis | Flanges | Critical loads | Compression | Moment (mechanics)

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