Plastic mechanism analysis of the resistance of ship longitudinal girders in grounding and collision

摘要: A theoretical model for ship bottom longitudinal girders being crushed during accidental raking process has been proposed and developed on the basis of nonlinear finite element analysis. Focus is placed establishing basic folding mechanism, identifying major energy dissipation pattern. Using plastic methods analysis, simplified analytical expression total dissipation, which composed bending membrane energy, formulated. Subsequently, mean horizontal resistance derived. It depends two free parameters, namely crushing distance wave angle. noted that optimality condition could not be achieved by minimising or force with respect to these parameters. Therefore, empirical expressions, agree reasonably results from simulations, have employed. Three series parametric/sensitivity studies carried out using LS-DYNA code. Comparisons between pro...