不同场地下土-结相互作用对风机结构地震响应影响研究OA

Earthquake disasters are significant factors affecting the normal operation of wind turbines,and soil-structure interaction(SSI)can influence the dynamic response of wind turbines.Focusing on onshore wind turbines in different site conditions(hard soil and soft soil),a refined finite element model of the turbine-foundation-soil system was established using ABAQUS,and a viscoelastic boundary was applied around the soil.Three seismic motions were selected from the PEER earthquake database for both hard and soft soil sites to perform dynamic time-history analysis of the entire structure under different seismic intensities,and examine the impact of site category and SSI effects on the seismic response of wind turbines.The results indicate that SSI effects amplify the seismic response of wind turbine structures.In hard soil sites,compared to scenarios without considering SSI effects,the maximum change rate of tower stress reaches up to 65.31%,and the maximum change rate of tower top displacement reaches up to 18.75%;in soft soil sites,the amplification effect of SSI on the dynamic response of wind turbines is more significant,with the maximum change rate of tower stress reaching up to 151.40%,and the maximum change rate of tower top displacement reaching up to 67.65%.Under seismic actions,the maximum tower top displacement of the wind turbine structure reaches 0.72 m,which is close to 1%of the total height of the tower;the maximum tower stress reaches 249.97 MPa,indicating a significant structural response and a risk of damage to wind turbine structures on soft soil foundations.This study provides a reference for the design of wind turbine structures,emphasizing the importance of considering SSI effects in wind turbine design,especially in soft soil areas,where the amplification effect of SSI on the dynamic response of wind turbines should be given particular attention.