Dynamic load-response characteristics analysis of deep-water jacket-type turbine-fishery integrated platform

Integrating fish cages with offshore wind turbine foundations reduces costs and is expected to become the dominant model for wind-fishery systems. However, research and engineering implementations remain limited, especially regarding dynamic amplification and fatigue damage under biofouling and rough sea states. This study proposes a hydrodynamic equivalent method for biofouled net panels and develops a finite-element model of a Chinese 18 MW jacket-type turbine-fishery integrated platform (TFIP). Dynamic responses under extreme conditions and fatigue accumulation under long-term cyclic loading are investigated. Results show that cages improve foundation dynamic responses, increasing base shear and overturning moment. The dynamic amplification factor rises by up to 12%, which must be considered in design. Moreover, the cage enhances responses within specific wave periods, leading to more concentrated fatigue damage in certain stress ranges and increased contributions from various wave directions to fatigue damage, highlighting its critical influence on the TFIP's overall fatigue performance.