Dynamic response analysis of monopile CFDST wind turbine tower system under wind-wave-seismic coupling action

The dynamic response of monopile-supported offshore wind turbine tower (OWT) structures under seismic action in undrained conditions is analyzed using ABAQUS. A typical example is established by using the NREL5MW OC3 Monopile wind turbine tower as a prototype. The aim is to compare the seismic performance of concrete-filled double-skin steel tubes (CFDST) and steel structural wind turbine tower systems. The impact of seismic incidence angles on the dynamic response of both types of wind turbine towers is investigated. Combining OpenFAST, a sophisticated numerical model for the multi-hazard coupling is also established for both CFDST and steel structural offshore monopile wind turbine tower systems. The influence of various loads on the tower top acceleration, tower top displacement, base shear, and base moment for the aforementioned two types of wind turbine tower systems is studied. The results indicate that under the coupling effects of wind, waves, and seismic forces, the monopile CFDST wind turbine tower system exhibits superior seismic performance, operational stability, and safety compared to traditional steel wind turbine tower systems, and has better development prospects.