Nonlinear seismic dynamic response and critical value evaluation based on limit states of wind turbine tower structures

Based on an actual wind turbine tower on land with the hub height of 50.41 m, the seismic dynamic response of the structure under different seismic loads was studied by a finite element model and time history analysis method. Then the horizontal displacement and stress critical values of the structure were discussed under serviceable limit state, plastic limit state and residual displacement limit state, and the critical response peak values of ground motion were calculated. Based on the above work, the seismic behavior of the structure was evaluated. It is shown that plate boundary type ground motion has a greater influence on this kind of structure. It takes the main place on critical value evaluation and performance evaluation. The serviceable limit state of the tower is the first limit state.