This study analyzes the dynamic behavior of three offshore wind turbine models with different megawatt classes. This study focuses on detailed modeling of wind turbine systems, including components such as blades, nacelle, tower, substructure, and monopile foundation, while also incorporating soil-structure interaction (SSI). The behavior of wind turbine structures under three loads, wind-wave and seismic forces, is emphatically analyzed. The results show that the nonlinear distribution pile-soil model is used to accurately evaluate the importance of the dynamics of large-capacity offshore wind turbines under three loads. The above research is essential to ensure its safety and reliability. Additionally, the study underscores the need to enhance design measures for structures with substantial substructure mass. Recommendations include increasing wall thickness and adding reinforcing elements to reduce seismic impacts and maintain structural integrity.