Research On Direct Calculation Of Yielding And Buckling Strength Based On CSR For Oil Tanker

To satisfy the requirement of maritime organization and ship owner, IACS established the Common Structural Rules for Oil Tanker (CSR), which has gone into effect at 1^st April 2006. The CSR is based on the concept of target ship, it has contained the experience and the newest research results of members of IACS. The yielding and buckling, which are usually defined two main failure modes for ship structures, are especially defined in CSR. This paper mainly researches the assessment of yielding strength by FEM and advanced buckling analysis according to the CSR. The main contents are as follows:1) Introduce the technology of FEM in CSR, including modeling ,loading , definition of Load cases and the adjustment of shear force and bending moment. Research the theoretical background of FEM according to the CSR by use of basic mechanics principle and the equal design wave approach (EDW)2) Research on the advanced buckling analysis in CSR, discuss the main impactions and the theoretical background of the advanced buckling analysis .Give a brief review of the theoretical background , design principles and purpose of PULS, which is a procedure recommended by IACS to assess the buckling strength.3) Research on the buckling assessment method in software of PULS, including a simplified method for elastic large deflection analysis of plates and stiffened panels due to local buckling, a semi-analytical model for global buckling and post buckling analysis of stiffened panels.4) Compile a PCL-based automatic loading program for wave pressures and inertial cargo pressures, An automatic extraction of stresses and the adjustment of shear force and bending moment program are written.5) The yielding strength, buckling strength assessment and fine mesh analysis of two 110 000t oil tanker were done according to the CSR. According to the conclusion of results, the different impactions of load cases are suggested.