Scale model test is an effective means to verify the design of stiffened cylindrical shells. However, there are problems of similarity distortion when traditional dimensional analysis is adopted to design scale models. In this study, an equivalent similarity method has been proposed to solve the problem. The method is applied to study the similarity of global bending mode of stiffened cylindrical shells. The equivalent criterion and scaling laws are derived and verified by numerical examples. The result of similar deviations shows that the scaling laws are highly accurate. The problem of similarity distortion can be resolved, and the parameters of scale model can be designed more freely with the proposed equivalent similarity method.
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