Abstract
Abstract It has been found that elementary structural theory cannot be applied with accuracy to problems concerning beams and columns having thin deep webs and thin wide flanges, because of nonuniform stress distribution which exists in the flanges. In this paper the problems of nonuniform axial flange stress are treated by means of efficiency factors which apply to the flange material. These basic factors are evaluated from theoretical considerations. Then, given a particular section and the manner of loading, it is necessary only to apply the proper flange efficiency factor to calculate reduced or effective section properties, which can be used in place of the geometrical properties in the elementary formulas for lateral bending or lateral column buckling. The results are substantiated by empirical data. Practical usage is illustrated with examples. The tangentmodulus column curve is shown to apply to stiffened-skin panels when based on a “true slenderness ratio” which allows for shear lag effects. Conclusions are drawn indicating design for best efficiency.
Published Version
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