Influence of net on structural response of jack-up truss net cage

Jack-up truss net cage provides a choice for better responding to the extreme environment of deep-sea aquaculture due to its structural characteristics of easily submerging the breeding net cage into the water. As a key component of the breeding net cage, net has an impact on the strength of the main structure of the net cage under environmental loads. This paper focuses on a jack-up truss net cage and establishes its finite element analysis model by using SESAM/GeniE to analyze the main structural response of net cage under the conditions of presence or absence of net and different net parameters. The results indicate that net has a significant impact on the evaluation of main structure response of net cage, especially under high current velocity conditions. Presence of net will increase the stress on the legs of net cage and utilization factor (UF) value of truss significantly, proving that the effect of net cannot be ignored when checking the strength of net cage's main structure. With different mesh grouping ratios, net has little effect on the evaluation result of jack-up truss net cage. In the simulation calculation of the main structure response of net cage, a larger mesh grouping ratio can be considered to improve the calculation efficiency. The change in the number of tie ropes for net has little effect on the evaluation of the main structure response of net cage, but adding more tie ropes can reduce the stress on tie points effectively.