Abstract
Pushover method is applied to analyze the behavior of a 53 m high wind turbine tower with the maximum diameter-to-thickness ratio of 184. The shell element is adapted to model the behavior of tower tube. In the analysis, the nonlinear behavior and local buckling of tower tube are both considered. The influence of initial geometry imperfection is studied. The results show that local buckling of tower tube appears when it reaches its peak load, which results in sudden decrease of bearing capacity. This kind wind turbine tower has little ductility. The initial geometric deflection has little influence on the bearing capacity and ductility. Meanwhile, the failure position is also checked based on the AISC Specification design code, which coincides well with the results based on pushover analysis. The deformation shape based on pushover results is compared with the deformation shape under earthquake excitation and they are similar with each other, which illustrates that the pushover results can be used to evaluate the response of tower under earthquake excitation.
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