Torsional Stiffening of I-Girder Webs

by Conrad P. Heins, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Maryland, College Park, Md.,
Robert A. Potocko, Grad. Research Asst.; Civ. Engrg. Dept., Univ. of Maryland, College Park, Md.,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 8, Pg. 1689-1698

Document Type: Journal Paper


The torsional response of box stiffened I-sections has been predicted by two analytical procedures. These methods utilize basic torsion theory and compatibility relationships. One method (approximate) is only applicable for L/a≤1.0 The other method (exact) is valid for all ranges of L/a. The analytical results for a cantilever stiffened beam are compared to experiments test giving excellent correlation. The results indicate that one stiffener can reduce rotations by 44% and two stiffeners by 55%. The induced warping stress is reduced by 20% and 30% for one and two stiffeners, respectively. A study of a fixed-fixed beam in uniform torsion with one stiffener, has shown that rotations are reduced by 50% and warping stress by 25%. The pinned-pinned beam response to uniform load and one stiffener gave a reduction of 25% in rotation and 50% in warping.

Subject Headings: Rotation | Warpage | Torsion | Stiffening | Girders | Webs (structure) | Cantilevers | Correlation

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