The researchers studied the strength of stiffened cylindrical shells with initial deformation. They found that the buckling loads of the stiffeners were almost the same as the panel loads, and the arrangement of rings had little effect. The experiments showed that the buckling loads of the stiffeners decreased by about 25% in compression and 19% in pure bending due to initial and torsional deformation. Overall, stiffened cylindrical shells with similar configurations have good buckling strength if the allowable load is set equal to the panel's buckling load.