STATIC AND FATIGUE ANALYSIS OF A SINGLE POINT MOORING JACKET

摘要

StruCAD~*3D program is used to perform the static and fatigue analysis of a Single Point Mooring (SPM) jacket in the present paper. The static analysis is conducted for members and joints under operating, extreme, and ice conditions, respectively. Nominal stress for members and punching shear stress for critical joints are checked according to the allowable stress. Deterministic approach is used for the detailed fatigue analysis of this jacket, in which the direct wave loading and high frequency mooring force are linearly combined in one load case, while the low frequency mooring force is treated as separate load case. The fatigue damage is analyzed separately and added to obtain the total damage. In the damage calculation API-X' curve and Airy wave theory is used and the fatigue life of critical tubular joints is evaluated by using appropriate safety factors. This paper can be a reference for the design and in-place safety assessment of jackets and platforms.