Research on the Lateral Compression Post-Buckling Similitude Model of Stiffened Cylindrical Shells with Dimple Imperfections

The new type of dry gas holder is a large thin-walled longitudinal-ring cylindrical shell with external reinforcement.The buckling characteristics of this kind of structure are relatively significant and sensitive to dimple imperfections.Due to limitations in test equipment，site conditions，materials，and funds，the buckling characteristics of large thin-walled longitudinal-ring stiffened cylindrical shells with dimple imperfections are generally studied by scaled model test.Generalized similitude condition and scaling laws were derived based on the smear stiffened method and energy method.Based on the dimple imperfection function，using static analysis，dimple imperfections were introduced into ideal stiffened cylindrical shells.An incomplete similarity analysis for the post-buckling of longitudinal-ring rectangular stiffened cylindrical shells with dimple imperfections was carried out under lateral compression.The results showed that combined with the corresponding buckling scaled principle formula， the post-buckling of rectangular stiffened cylindrical shells with dimple imperfections under lateral compression based on the incomplete similarity model could better predict the post-buckling characteristics of the prototype.Furthermore，the closer the Poisson's ratio of the incomplete similarity models was to that of the prototype， the more accurate the post-buckling similarity prediction became.