In the above equations, k is the plate buckling coefficient, d, w, and D are the dimensions shown in Figure 6.15, ds is the reduced effective width of the stiffener, d's is the effective width of the stiffener calculated as unstiffened element under uniform compression, and b1 and b2 are the effective widths shown in Figure 6.15, As is the reduced area of the stiffener, Ia is the adequate moment of inertia of the

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