Dynamic response analysis of steel-concrete hybrid tower considering P-Δ effect

To improve the efficiency of analyzing the dynamic responses of the wind turbine steel-concrete hybrid tower,an efficient analysis method is proposed for analyzing the dynamic responses. The wind turbine steel-concrete hybrid tower is regarded as a Euler-Bernoulli cantilever beam with a lumped mass at its free end. The influence of the second-order gravity effect (P-Δ effect)on the overall structural dynamic response is considered,as well as the effect of the steel and concrete on the overall damping ratio of the structure. A comparison with finite element simulation results based on ABAQUS validates the effectiveness of the proposed method,and the influence of the P-Δ effect on the overall dynamic responses is investigated. The comparison results indicate that compared with the results without considering the P-Δ effect,the theoretical analysis results considering the P-Δ effect are closer to the finite element analysis results. The maximum relative errors between the theoretical and the finite element analysis results for displacement,velocity,and acceleration are 3. 09%,3. 81%,and 4. 63%,respectively. It indicates that the established analysis model for the dynamic response of the wind turbine steel-concrete hybrid tower has a comparable calculation accuracy to the finite element analysis. © 2024 Southeast University. All rights reserved.