Investigation on structural performance predictions of double-bottom tankers during shoal grounding accidents |
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| Institution: | 1. State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Marine Technology, NTNU, Trondheim, Norway;1. College of Electronic Engineering, Heilongjiang University, Harbin 150080, China;2. State Key Laboratory Breeding Base of Dielectric Engineering, Harbin University of Science and Technology, Harbin 150080, China;3. Harbin Research Institute of Electrical Instruments, Harbin 150028, China;1. Marine Technology Research Group, Department of Mechanical Engineering, Aalto University, Tietotie 1C, 02150 Espoo, Finland;2. Engineering Modeling and Applied Social Sciences (CECS), Federal University of ABC, Av. Dos Estados, 5001, Santo André - SP 09210-580, Brazil;3. Advanced Manufacturing and Materials Research Group, Department of Mechanical Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland;1. Aalto University School of Engineering, Department of Applied Mechanics, Marine Technology, Research Group on Maritime Risk and Safety, Puumiehenkuja 5 A, 02150, Espoo, Finland;2. Aalto University School of Engineering, Department of Applied Mechanics, Marine Technology, Research Group on Advanced Marine Structures, Finland;3. Department of Mechanics, Faculty of Civil Engineering, Tallinn University of Technology, Estonia |
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| Abstract: | An investigation is carried out in this paper for the predictions of structural performance of double-bottom tankers during ship grounding over the “shoal” type seabed obstacles. Hong and Amdahl developed a simplified analytical model for the unstiffened double bottom. This method is carefully studied, verified and then used as the first stage of our prediction. The second stage is concerned with stiffeners since stiffeners are indispensable components for double-bottom tankers. A prevailing way to handle is to smear stiffeners onto their attached plating known as the smeared thickness method. However, the effective ratio in this method is dubious in such shoal grounding accidents. Proper values of this parameter are determined in stage two, and then together with the method in stage one, constitute a reliable and efficient tool for structural performance predictions of double-bottom structures in shoal grounding accidents.A double-bottom tanker is chosen as object for the case study. Finite element models of the hold both stiffened and unstiffened are created for numerical simulations using the LS_DYNA software. Simulation cases cover a wide range of slope angles of the indenter and indentations. Numerical results show that Hong and Amdahl's model in stage one is capable of predicting energy dissipation with high precision but poor accuracy for grounding resistances, and a possible reason may be the neglect of vertical resistance. The updated smeared method proposed in stage two is also proved to be capable of grasping major characteristics of stiffeners. Results and conclusions drawn from this paper can be conveniently applied for assessments of the performance of ship double-bottom structures during shoal sliding grounding scenarios, and will benefit the application of accidental limit state design concept in the ship design stage. |
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| Keywords: | Shoal grounding Analytical analysis Smeared thickness method Numerical simulation Distortion energy Resistance |
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