• Shaking table test and numerical simulation reveal the static and dynamic characteristics of the hybrid tower. • Evaluated different joint schemes’ impacts on the hybrid tower operation state. • Carified joint damage states’ effects on hybrid tower static and dynamic performance. To clarify the effect of damage on the dynamic response of the wind tower and verify the FE method, shaking table tests of the simplified model are carried out. The results reveal that the acceleration response at the tower top exhibits a distinct beat vibration phenomenon under specific external load excitations. Subsequently, a series of finite element analyses is carried out to study the static and dynamic characteristics of the prefabricated prestressed steel-concrete hybrid tower. Under static load, variations in structural stiffness and joint configurations induce stress redistribution, significantly affecting the global stress state of the tower. Compared to the integral tower, the presence of horizontal joints has a negligible impact on the mode shape and natural frequency of the wind turbine tower, with the maximum reduction in each frequency order being only 0.79%. The appearance of vertical joints caused a significant decrease in the frequencies of each order of the tower, with the reduction in the frequencies of each order of modes reaching 4.94%, 24.64%, and 16.58%, respectively. When the joints of the concrete tower section are damaged to varying degrees, the impact on the stress and deformation of the prestressed hybrid tower is almost identical for different joint designs. Furthermore, the impact of joint damage on the frequencies of each order in the hybrid tower with different joint conditions is also almost uniform. The research findings provide important technical support for the design and fatigue risk prevention of hybrid tower structures.
Hao et al. (Fri,) studied this question.