[Objectives]In order to accurately assess the ultimate load-bearing capacity of a hull structure under cyclic loading,it is necessary to consider the effects of the cyclic properties of the load on the ultimate strength of hull stiffened plates.[Methods]Finite element software ANSYS is used to carry out the numer-ical simulation of ultimate strength based on the elastic shakedown limit state under in-plane cyclic loading for 200 T-bar stiffened plates and flat-bar stiffened plates.The material Bauschinger effect,welding initial de-formation and residual stresses of the hull stiffened plates under in-plane cyclic loading are considered in de-tail.Based on the stiffened plate nonlinear finite element numerical simulation results of the elastic shake-down limit state,the dimensionless ultimate strength of the stiffened plates is taken as the objective function,the flexibility coefficients of the plates and stiffeners are taken as the independent variables,and a formula for predicting the ultimate strength of hull stiffened plates under in-plane cyclic loading based on the elastic shakedown limit state is proposed.[Results]The accuracy of the formula is verified through comparison with the nonlinear finite element simulation results.[Conclusions]This study has positive theoretical and engineering significance for the ultimate strength assessment of hull stiffened plates under cyclic loading.
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