海上风电钢管混凝土导管架荷载-结构耦合动力响应分析OA

Jacket support structures are a predominant foundation form for offshore wind power development in transitional water depths(30-60 m).Although they provide superior structural stiffness compared to monopile foundations,their construction costs remain relatively high.This study proposes an optimized concrete-filled steel tube(CFST)composite structural solution.By implementing full-section concrete filling in the jacket corner columns,the material synergy effect of steel-concrete composite structures is fully exploited,achieving optimized steel wall thickness(17.3%reduction in steel consumption)while maintaining structural stiffness.Firstly,finite element numerical analysis models with and without concrete-filled corner columns were established to verify the bearing capacity of KK joints after concrete filling.The results show that the bearing capacity is greatly improved compared with traditional pure steel structures after concrete filling in the corner columns.Subsequently,a coupled load-structure numerical model for jacket-supported offshore wind turbines was developed to conduct time-domain coupled dynamic response simulations under both normal operation and extreme shutdown conditions.The results show that under normal operating conditions,the CFST jacket support structure exhibits reduced tower top displacement,foundation surge,and pitch motions compared to conventional steel structures,albeit with a slight increase in nacelle acceleration.The overall load response fluctuation amplitude decreases significantly,indicating improved fatigue resistance.Under extreme conditions,both dynamic responses and loads of the CFST structure are notably lower than those of the pure steel structure,indicating higher structural safety.