Reliability-based method for optimal structural design of stiffened panels

Abstract A methodology for structural optimization of stiffened panels based on reliability is developed. The stiffened panels are typical of those found in the deck or bottom of longitudinally stiffened ships. They are assumed to be under stillwater and wave induced loads, resulting in predominantly compressive loads. Both serviceability and collapse limit states are considered. The design problem is formulated as a nonlinear programming problem that aims at minimizing weight with behaviour constraints on reliability and physical constraints on the dimensions. The safety index is calculated using a first order reliability method (FORM). The PNET method is then employed to determine the representative failure modes and the system safety index. Finally, a numerical example is carried out to demonstrate the applicability of the design methodology and the results are presented and discussed.

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