Design load and yielding strength analyses of the floating structure of a truss-type offshore cage

Abstract

Compared to traditional cages, a module-based offshore fish farming platform composed of truss-type cages adapts better to a harsh offshore environment. This study focuses on the structural yielding strength performance of the floating structure of a single cage without considering the dynamic effect of nets. The hydrodynamic coefficient of the grid structure calculated by the Morison equation and combined with computational fluid dynamics is used to calculate the wave load response of the floating frame structure of the truss-type offshore cage, determine the designed wave parameters, and derive the design load by calculation. Then, the finite element method is used to calculate the stress response of the floating frame structure under the design load, check the yield strength of the structure, and refine the spherical and tubular joint mesh to analyze the local strength. The results show that the yield strength of the designed floating structure of the truss-type offshore cage meets the specification requirements at the 6 m wave height.