The Structure Strength And Redundancy Analysis Of Bulk Carriers Based On CSR

For international shipbuilding industry nowadays, Common Structural Rules (CSR)contains Common Structural Rules for Bulk Carriers (which is short for CSR-BC in the thesis)and Common Structural Rules for Double Hull Oil Tankers (which is short for CSR-OT in thethesis). CSR makes crucial effects on safety and economy of shipbuilding engineeringworldwide. However, in spite of advantages of CSR, a host of inconveniences are induced bydifferences between CSR-BC and CSR-OT. Thus, in order to unify CSR-BC and CSR-OT,HCSR is established by International Association of Classification Societies. In the future, byHCSR, revolutionary changes will be introduced to shipbuilding industry, which is morescientific and reliable than CSR. Besides that, HCSR also plays an important role in thedevelopment of ship safety rule. Firstly, this paper presents comparison between direct yieldstrength assessment methods of both CSR-BC and HCSR. Then, the hull structure redundancyis studied and a method of structure redundancy analysis is proposed. The main contents aredescribed as below:（1）Direct yield strength assessment methods and procedures of both CSR-BC andHCSR are systematically summarized.（2）Yield strength assessment methods of both CSR-BC and HCSR are compared.Including: finite element modeling, loads and loading conditions, loads calculations methods,boundary conditions and yield assessment criteria.（3）Direct yield strength of a bulk carrier is calculated by CSR-BC and HCSRrespectively, and the calculating results are compared. It is concluded that HCSR is morescientific and reliable, which is worth implementating and promoting.（4）The concept of hull structure redundancy is described in this paper. A method ofstructure redundancy analysis is proposed. And then, the structure redundancy of a bulkcarrier is calculated. To sum up, a solid foundation is established for further research on hullstructure redundancy.