Experimentation Rotation Capacity of Steel Beams-Columns

by Giuliano Augusti,

Serial Information: Journal of the Structural Division, 1964, Vol. 90, Issue 6, Pg. 171-188

Document Type: Journal Paper


The results of 31 tests on small scale mild-steel I-section stanchions are presented. The specimens were loaded by a constant axial load and bending moment acting at one end in the plane of the web. Minor axis and longitudinal rotations were prevented at both ends; the minor axis slenderness ratio varied between 75 and 195. Two sections were used, both rather thick-walled, so that there was no danger of local buckling. Consequently, failure occurred by either excessive (in-plane) bending or lateral-torsional buckling, mostly in the plastic range. A stiff bending device allowed the moment-rotation curve to be followed in the falling part of the curve. The experimental rotation capacity, defined as the angle of plastic rotation at nine-tenths of the maximum (collapse) moment has thus been obtained for each specimen. These rotation capacities, plotted versus the axial load and the slenderness ratio, suggest a regular pattern, irrespective of the type of failure which is similar to the theoretical pattern obtained by other authors. No theoretical analysis of the results is developed.

Subject Headings: Axial loads | Moment (mechanics) | Rotation | Steel beams | Cross sections | Buckling | Material failures | Failure analysis

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