Analytic Expression of the Buckling Loads for Stiffened Plates with Bulb-Flat Flanges

摘要

The subject of this research is the buckling behavior of a simply supported rectangular plate, with a bulb-flat stiffener attached to one side of the plate The plate structure is subjected to axial compression that increases to the buckling load, The stiffener cross-section has a thin web and a bulb-flat flange that extends to one side of the web, Results of the investigation include planar property formulas% for the asymmetric flange geometry, an analytic expression for the Saint Venant torsional constant of the flange cross-section, and an analytic expression for the buckling load corresponding to a tripping mode of the structure, The torsional constant for the bulb-flat stiffener is 15% - 23% higher than understood previously, The analytic expression for the buckling load of the bulb-flat stiffened plates considered in this investigation yields values that are 2% - 6% higher than finite element results, It is also shown that the buckling load of a plate with a bulb-flat stiffener is 3% - 4% less than that of a plate with a T-flange stiffener with the same cross- sectional area, At the onset of stiffener tripping, the torsionally superior bulb-flat tends to bend laterally, while the flexurally superior T-flange tends to twist.