基于Pushover方法的风电混合塔筒失效过程分析OA

To investigate the failure process of the concrete tower segment in prefabricated steel-concrete hybrid wind turbine towers under extreme loading conditions and to identify the governing influencing factors,a refined finite element model is developed and a series of pushover analyses are performed.The results indicate that the failure evolution of the tower exhibits pronounced stage characteristics.When the applied displacement reaches 32%of the total displacement,horizontal joint separation initiates at 59.5%of the hybrid tower height,and as the displacement increases to 68.6%of the total displacement and the separation area at this location expands to 50%,the tower reaches its maximum load-bearing capacity.When the displacement further increases to 94.4%of the total displacement,the structure enters an overturning stage triggered by tensile stiffness degradation,and once the volume of tensile stiffness with significant degradation reaches 0.35%of the segmental volume at the corresponding level,global instability of the tower occurs.Throughout the entire failure process,the staged development of tensile damage plays a dominant role.The results demonstrate that joint separation behavior and the accumulation of tensile damage are the key mechanisms governing the performance degradation of steel-concrete hybrid wind turbine towers,and optimizing joint configuration and enhancing tensile resistance design are therefore effective measures for improving the anti-overturning capacity of such structures.