Research On The Yielding Strength Criterion Of HCSR Based On Reliability Analysis

Common Structural Rules had been implemented by IACS on April 1, 2006.Although CSR has effectively prevented vicious competition among classification societies and promoted new ship design concept of more safer, durable, and firm, it does bring a lot of inconvenience owing to different roadmap and technical background of two rules. Therefore,the coordination project teams have been formed to compile Harmonized Common Structural Rules (HCSR) which resolves the disputes caused by uncoordinated CSR.Chinese shipbuilding industry should promptly conduct researches for technical background and key technical content of HCSR and then timely supply comments and suggestions on unreasonable regulation through openly public consultation to improve the technical strength of China's shipbuilding industry and our country's influence in the international shipbuilding industry.Based on HCSR revision, the direct calculation methods of yielding strength and strength criterion have been researched in this paper. The main contents are as follows:(1) The direct calculation method of HCSR finite element yielding strength has been studied. The implementation methods of the key problems including model foundation, load case determination, design load, bending and shear force adjustment, boundary conditions and strength criterion are discussed, the key technology is analyzed.(2) Based on HCSR corresponding regulation, the program about load applying and stress extraction has been complied by Patran Command Language. The automation of applying load and extracting stress has been achieved. The workload of calculating structure stress response have been greatly reduced.(3) The time history of stress are obtained by using linear superposition method. The long term distribution of stress are obtained through statistical analysis of the time history of stress. A reliability analysis method is proposed to verify the criterion of yielding strength.