Elastic Instability of Unbraced Space Frames

by Zia Razzaq, (M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., Univ. of Notre Dame, Notre Dame, Ind.,
Moossa M. Naim, Formerly, Graduate Student; Dept. of Civ. Engrg., Arizona State Univ., Tempe, Ariz.,

Serial Information: Journal of the Structural Division, 1980, Vol. 106, Issue 7, Pg. 1389-1400

Document Type: Journal Paper


Elastic instability of rigid-jointed, unbraced, single-story single-bay, orthogonal space frames subjected to static loads at the column tops is studied. The columns are assumed to be fixed at the base. The influence on the frame behavior of the relative magnitude of the load-multiplication factors for the four columns and the orientation of the principal axes of the column cross-sections is investigated. The instability loads are also compared with those obtained approximately using the effective-length approach. Interesting conclusions are drawn based on the results of 12 numerical examples.

Subject Headings: Space frames | Load factors | Columns | Elastic analysis | Static loads | Low-rise buildings | Rigid frames | Structural behavior

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