Pages 115-121
It is important to know longitudinal strength of ship structures. Collapse of hull girder under the longitudinal bending moment is the most serious ship collapse mechanism. In this paper, ultimate longitudinal bending moment is calculated using Smith method. Stress-strain curves of rectangular plates, which are used in Smith method, are obtained from numerical database of F.E.M considering large deflection and elasto-plastic behavior. This method is applied to reliability analysis and statistical values such as standard deviations and reliability indexes are investigated by Monte Carlo simulation and sensitivity analysis. It is found from this study that the values of COVs of ultimate longitudinal bending moments are less than half of ones of yield stresses.
