Strength of Steel Frames under Gravity Loads

by Francois Cheong-Siat-Moy, (A.M.ASCE), Post-Doct. Research Assoc.; Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
Le-Wu Lu, (M.ASCE), Prof. of Civ. Engrg.; Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
Erkan Ozer, Assoc. Prof. of Civ. Engrg.; Istanbul Technical Univ., Istanbul, Turkey; formerly, Research Assoc., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,

Serial Information: Journal of the Structural Division, 1977, Vol. 103, Issue 6, Pg. 1223-1235

Document Type: Journal Paper


The stability of tall, rigidly-jointed, unbraced, steel frames under pure gravity loads is ensured when proportioned by the current allowable-stress concept provided they meet certain specified constraints. These requirements, in fact, govern the individual story stiffnesses and the maximum axial stresses in the columns. A study on seven building frames confirms that for a class of inherently stiff frames, all instability effects may be ignored in design without affecting structural safety under gravity loads.

Subject Headings: Steel frames | Gravity loads | Structural strength | Strength of materials | Rigid frames | Axial forces | Building design | Structural safety

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