In order to explore the nonlinear behavior characteristics of dry-connected prefabricated wind turbine hybrid towers under complex coupled loads, this paper uses ANSYS and ABAQUS software to establish integrated finite element models, covering wind turbine foundation, concrete tower, steel adapter, steel tower, and wind turbine. Static loading analysis is conducted using cross-sectional loads provided by the wind turbine manufacturer to verify the correctness of the calculation results of two finite element models. On this basis, systematic research was conducted on the boundary nonlinearity, material nonlinearity, and geometric nonlinearity behavior characteristics of tower structures. The effects of joint connection status, concrete elastic-plastic damage model, and geometric large deformation on the bearing capacity and deformation capacity of the tower were analyzed. Research results show that： under the action of extreme large bending moments, the horizontal joint on the windward side of the tower may detach, allowing space for tangential sliding of the vertical joints, resulting in squeeze each other of the upper and lower concrete segments, and a large range of stress concentration in the concrete segments. The squeeze phenomenon is more obvious after opening the geometric deformation; When the principal tensile stress of concrete segment exceeds the tensile strength, the concrete will crack, and the steel reinforcements work together to bear the force, the concrete undergoes stress redistribution, that ensuring the overall bearing capacity and stability of the tower under ultimate load.
Key words
onshore wind power /
prefabricated /
hybrid tower /
connecting joint /
nonlinear behavior
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