Analytical formulations and comparison of collapse models for risk analysis of axisymmetrically imperfect ring-stiffened cylinders under hydrostatic pressure

Risk-based design of marine pressure hulls require computationally efficient and precise models predicting collapse pressures ring stiffened cylindrical shells as a function realistic geometrical imperfections. However, the empirical interframe commonly implemented in codes do not explicitly depend on imperfections, existing analytical are only valid for axisymmetrically imperfect shells. The goal is to derive an model that depends axisymmetric asymmetric In order such model, first stress development investigated using nonlinear Finite Element Analysis (FEA) twelve having imperfections only. knowledge gained from these investigations used qualify three models. One them, integral introduced by authors, accurate sufficiently precise. It uses new definition collapse, which also allows