A Shear Lag Anomaly

by Douglas A. Foutch, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Univ. of Illinois at Urbana-Champaign, 3108 NCEL, 208 N. Romine, Urbana, Ill. 61801,
P. C. Chang, Research Asst.; Univ. of Illinois at Urbana-Champaign, 3108 NCEL, 208 N. Romine, Urbana, Ill. 61801,


Serial Information: Journal of the Structural Division, 1982, Vol. 108, Issue 7, Pg. 1653-1658


Document Type: Journal Paper

Discussion: Coull Alexander (See full record)
Discussion: Davis Raymond E. (See full record)
Closure: (See full record)

Abstract: This technical note reports an interesting phenomenon associated with shear lag in the flanges of box girders that is quite contrary to well established ideas concerning this subject. A brief description of a beam model and solution technique are given. It is shown that if a cantilever tube is loaded laterally under non-uniform shear, a reversal of the shear lag distribution may occur at some point in the beam; the centerline stress may exceed the edge stress. Although the practical significance is not clear, further study is encouraged to explain the phenomenon and explore its significance.

Subject Headings: Shear lag | Lateral loads | Shear stress | Flanges | Box girders | Structural models | Cantilevers

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