Stiffened plates and cylindrical shells under interactive buckling

Cylindrical shells are often reinforced with stiffeners in the form of stringers or rings depending upon whether they are subject to axial or hoop compression. The presence of stiffeners not only enhances the buckling capacity but also reduces the imperfection-sensitivity of the shells. Because of the resistance offered by the stiffeners to radial movement, ‘local’ buckling modes whose nodal lines do not coincide with the location of the stiffeners are simply eliminated. This has the effect of minimizing the nonlinear modal interactions which are the source of imperfection-sensitivity in unstiffened shells.

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