|
|
||
|
|
|
|
This slide demonstrates that the greatest sensitivity to imperfections of the load-carrying capability of an axially compressed stiffened plate (or column the cross section of which consists of thin-walled segments) occurs in the neighborhood of the design for which local and general buckling of the perfect structure occur simultaneously.
The variable, b, is the stiffener spacing.
The imperfect column or stiffened plate 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 because it is in its locally post-buckled state.
This significant reduction in average effective axial stiffness of the locally buckled skin significantly affects the load at which the stiffened plate or column subsequently buckles in a general mode.
Page 60 / 67