Research Article
Aug 1968
Inelastic Buckling of Unbraced Space Frames
Publication: Journal of the Structural Division
Volume 94, Issue 8
Abstract
Inelastic lateral buckling of an unbraced orthogonal space frame is studied analytically. The frame consists of four simply-supported columns and four beams, with two beams framing into each column top. All members are of hollow, rectangular cross section of elastic-plastic material. Uniform load is applied to each beam along with concentrated loads at the column tops to simulate multistory frames. Both the frame and loading have two planes of symmetry. The collapse load, assuming the frame to remain stable, and the lateral buckling load are determined. Single-story frames carried loads of at least 90% of the collapse load before buckling occurred. Many simulated three-story frames buckled laterally at loads considerably less than the collapse load. Comparison of results with the AISC requirements for columns in unbraced plane frames indicates that the requirements are conservative when the columns are subjected to biaxial moments. Equations for estimating the lateral buckling load for the frames studied are given.
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Published In
Journal of the Structural Division
Volume 94 • Issue 8 • August 1968
Pages: 1863 - 1885
Copyright
© 1968 American Society of Civil Engineers.
History
Published in print: Aug 1968
Published online: Feb 1, 2021
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Authors
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William W. McVinnie, AM.ASCE
Asst. Prof., Dept. of Civ. Engrg., Univ. of Windsor, Windsor, Ont., Canada
Edwin H. Gaylord, F.ASCE
Prof., Dept. of Civil Engrg., Univ. of Illinois, Urbana, Ill.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
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.