INVESTIGATION OF CONTAINER SHIP STRUCTURAL DYNAMIC ULTIMATE STRENGTH UNDER COMBINED BENDING, TORSION AND LATERAL PRESSURE

The dynamic ultimate strength of ship structure has been paid more and more attention by researchers as an important parameter to evaluate ship maximum capacity. Due to the influence of inertia effect and stress wave effect and so on, the dynamic ultimate strength is more complicated than the static ultimate strength, whose determination needs to consider all aspects to get more accurate results. Therefore, this research takes the hull girder model of container ship as the research object, and mainly studies the dynamic ultimate strength of the hull girder based on the nonlinear finite element method. Firstly, the dynamic ultimate strength of the hull girder under the slamming moment load is studied, and it is found that the dynamic ultimate strength of the hull girder decreases with the increase of the slamming duration. Considering the load of the ship within actual sea states, the dynamic strength of the hull girder under the combined influence of lateral pressure on the bottom of the ship, the torsion of the hull girder and the slamming load are explored. Finally, it is found that the lateral pressure and the torsion of the hull girder are two unfavorable factors, which will reduce the dynamic ultimate strength of the hull girder to a certain extent.