Dynamic Response and Fatigue Analysis of Jacket Structure Under Wind and Wave Loads.

In order to study the dynamic response of offshore platforms in complex marine environments (combined action of wind, wave and current loads), the offshore jacket platform model was established by using finite element software, the strength of its ultimate load structure was checked, and different working conditions were simulated and analyzed to grasp its dynamic response characteristics and rules, and finally its fatigue life was predicted by combining with S-N curve. The results show that the natural vibration period of the jacket structure is much smaller than the wave period, and the resonance basically does not occur. Under the extreme storm, the strength and stiffness of the jacket structure meet the requirements, and with the increase of wave height and wave velocity, the maximum equivalent stress and maximum displacement are significantly improved, the maximum stress increases by more than 182.76%, and the displacement increases by more than 182.72%, and the maximum stress area occurs at the intersection of the diagonal brace support. The fatigue life of the jacket structure is predicted to be 44.19 years, which meets the design requirements. [ABSTRACT FROM AUTHOR]