Abstract
Compared with onshore wind turbine, the offshore wind turbine is more easily destroyed influenced by the complicated conditions at sea. In this study, a refined finite element model of offshore wind turbine in consideration of the soil-structure interaction is built. The dynamic response of the wind turbine tower in different water depths is investigated; then the weak positions of the wind turbine tower under earthquake is determined. We found that the water pressure on one side of the inflow face of pile foundation is the greatest; as the rate of flow increases, the negative water pressure on the contact surface increased more than the positive water pressure. The maximum displacement of the structure influenced by dynamic water pressure is located at the tower top, the maximum equivalent stress strain is located at two-thirds of the tower height, and the maximum bending moment appears at the bottom of the tower. When the water depth increases from 0 m to 5 m, the displacement and bending moment of wind tower structure increased by 29 % and 25 % respectively under the influence of dynamic water pressure; thus the influence of dynamic water pressure on the dynamic response of the structure should be paid attention to. Finally, the shaking table test of the wind turbine is conducted; the test results are compared with the numerical simulation results, and feasibility of the numerical simulation method was verified.
Highlights
Wind turbine is a typical variable-section, variable-diameter, tall and flexible thin-walled cantilever structure
We will analyze the influence laws of dynamic water pressure on seismic dynamic response of wind turbine tower, and water acted on structures in the form of additional mass
Some measures should be taken in the structure design of wind turbine tower according to the position where the maximum value appears
Summary
Wind turbine is a typical variable-section, variable-diameter, tall and flexible thin-walled cantilever structure. Huang et al.[11, 12] used Morison equation and the radiation wave theory respectively to establish a method for calculating dynamic water pressure, and pointed out that the effect of dynamic water pressure changed the dynamic characteristics of bridge piers and increased the seismic response of bridge piers. Wind turbine belongs to a new energy structure developed in recent years; at present, there are many researches on the influence of dynamic water pressure on pier structure under earthquake, while there are less researches on the influence of dynamic water pressure on the seismic dynamic response of wind turbine considering the influence of pile-soil interaction through the three-dimensional refined model. We designed an indoor wind turbine model based on the similarity theory, and conducted comparative analysis of the experimental results and numerical simulation results based on shaking table test
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