An integrated analytical tool is introduced in this paper, which can be used to predict the structural responses, including resistance, energy dissipation and structural damage, for the ships under accidental collision and grounding scenarios. On purpose of preventing the disastrous consequences due to ship collision and grounding from happening, it is necessary to predict the structural responses and the event consequences during the structure design stage, and mostly important, in a cost-effective and conveniently using way, that can be accepted by ship structure designers. Analytical prediction method has the advantages of cost-effective and fast-calculation. Therefore, an integrated analytical tool is built to predict ship structural response under collision and grounding accident scenarios.
This analytical tool contains two modules, one is ship collision module and the other is ship grounding module. In ship collision module, the scenario of head on striking in a right angle is adopted as the most critical scenario. The major structural properties of the striking vessel and those of the struck vessel can be defined, including ship hull scantling, plate thickness, scantling of stiffeners, striking positions, striking velocity and material property. The shape of the striking ship’s bow can be defined as bulbous bow or raked bow. In ship grounding module, powered grounding is defined as the critical grounding scenario. Scantling of ship bottom structure, plate thickness, scantling of stiffeners, material property, ship grounding velocity, shape of the indenter and the grounding positions are the mandatory input parameters.
With the application of the analytical tool, structural resistance, energy dissipation and structural damage can be calculated by a series of analytical equations. These analytical expressions on resistance and energy dissipation come from the related work conducted in SJTU within the past few years.
Furthermore, numerical simulations were also conducted with code LS_DYNA, to prove the feasibility of the analytical tool. This integrated analytical tool can tell the structural designer the crashworthiness of the ship under collision and grounding scenario during the structural design stage.