Study On Rapid Strength Assessment Method Of Enhanced Side Structure Under Ice Load

Arctic sea ice extent is declining due to the gradually rising of the global temperature, which largely increases human’s interest in exploring for oil and gas in the Arctic and the potentials of commercial shipping using the Arctic routes.However, the sea ice in the Arctic routes poses a great threat to the safety of the commercial ships. As a result, the ice load has been taken into consideration in designing ice-going ships. In ABS ice class guidance note, it requires nonlinear finite element analysis(NLFEA) to evaluate the structural strength of the ice-going ships, which is usually time consuming. In order to reduce the time and work when carrying out the structural strength assessment, this thesis focus on finding a simplified method to evaluate the ice-going ship’s structural strength rapidly. The thesis has 4 parts as follows.1. The background of this research and advance research in Arctic ship designing are introduced, and the procedure of the direct calculating method required in ABS ice class guidance note is elaborated.2. The plastic formulation of clamped rectangular plating subjected to ice load is being studied. And a revise formulation based on NLFEA is proposed, with its application validated.3. A rapid strength assessment method is proposed using the revise plastic design formulation and the elastic formulation of the rectangular plating, which validated when the ice load patch is smaller than the grid.4. Three different simplified modeling methods are put forward, which reduce NLFEA calculation time by reducing the extent of the ship structural modeling according to the length and width of load patch...