Shear Lag in Stiffened Box Girders

by David J. Malcolm, Grad. Asst.; Univ. of Calgary, Calgary, Alberta, Canada,
Richard G. Redwood, Assoc. Prof.; McGill Univ., Montreal, Canada,


Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 7, Pg. 1403-1419


Document Type: Journal Paper

Abstract:

Methods for the analysis of shear lag in wide flanges are reviewed and a treatment is presented which incorporates the effect of the web upon the stress distribution in the stiffened flange of a box girder by replacing the web with an edge stiffener on the flange. Attention is drawn to the effect of severe shear lag on the curvature and displaced shape of a cantilevered box girder. A series of tests on model girders is described and the results are compared with an approximate stiffener-sheet analysis, a more rigorous orthotropic plate analysis, and a plane stress finite element analysis; the latter is used to analyze flanges under more complex conditions. A three-dimensional finite element analysis confirmed the observed curvatures at the section of high shear lag.

Subject Headings: Stress analysis | Finite element method | Flanges | Stiffening | Shear lag | Box girders | Webs (structure) | Stress distribution

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