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This slide demonstrates that the greatest sensitivity to imperfections of the load-carrying capability of an axially compressed stiffened plate (or column that is comprised of thin-walled segments) occurs in the neighborhood of the design for which local and general buckling of the perfect plate or column occur simultaneously.
The imperfect stiffened plate or column bends as soon as any axial load is applied to it. This overall bending leads to early local buckling of the skin where the maximum axial compression occurs in the skin. The locally buckled skin in that region thereby has a reduced average effective axial stiffness.
This significant reduction in effective average axial stiffness of the skin significantly affects the load at which the stiffened plate or column subsequently buckles in a general (Euler-type) mode.
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