Experimental study and finite element analysis on impact resistance of wind turbine steel truss foundation

In recent years, steel truss structures have been widely used in civil engineering and wind turbines. In addition to bearing vertical loads, they are also vulnerable to impact accidental loads. If the foundation structure undergoes large deformation, it will lead to the overall instability and collapse of the structure. In this paper, the impact load resistance of steel truss foundation of wind turbine under eccentric mass is taken as the research object, and the combination of pendulum impact test and finite element simulation is adopted. The impact resistance of steel truss foundation was analyzed from the parameters of failure characteristics, impact response and energy dissipation capacity through multiple pendulum impact tests. The results show that after two impacts the stiffness of the impact leg is significantly reduced and even fracture at its root. The branch tube near the point of impact are squeezed and bent, and the deformation and acceleration peak of the impact position are the largest. The denting of the impact leg is the main energy dissipation mechanism. These data provide an experimental basis for improving the impact resistance of full-scale wind turbine structures.