| Wind energy is a kind of green energy in nature,which has the characteristics of renewable,environmental protection,clean,etc.,has brought a positive role for social and economic development,and has been widely concerned.At the present stage,most of the wind turbine structures use the steel tower tube.With the influence of power generation,transportation restriction and corrosion prevention and other factors,the steel tower tube also shows some defects.For example: the steel structure maintenance difficulty is big,the installment is inconvenient,the manufacture cost is high,the service life is short and so on.However,the concrete tower tube has better vibration resistance and greater stiffness,making it an alternative structure.At the same time,some researchers began to study the form of concrete tower tube.With the overall increase of the power of wind turbine,the types and sizes of its components increase accordingly.At this point,the concrete tower in terms of economic indicators,or in terms of structural stiffness have shown obvious advantages.This paper hopes to provide references for the design and specification of concrete tower barrel of wind turbine in China through model test and finite element numerical analysis based on actual engineering structure.Firstly,the model design and test are carried out based on the practical engineering background and the similarity criterion.The concrete tower cylinder model test of wind turbine was carried out on a large multi-channel loading test machine.In this test,a monotonic static loading test was carried out on the concrete tower barrel model of the wind turbine unit.The lateral ultimate bearing capacity of the tower top was8340 N,and the corresponding peak displacement was 73.38 mm.Under the action of horizontal load on the top of the tower,the specimens show the crushing of concrete in the compression zone at the bottom of the tower,the bending failure characteristics of steel bars in the tensile zone,and the regularity of equal spacing distribution of concrete cracks in the tensile zone.It canbe seen from the readings of the concrete surface strain gauge in the compression zone of the tower wall and the steel surface strain gauge in the tension zone that when the concrete in the compression zone at the bottom of the tower is crushed,the steel bar in the tension zone has yielded,indicating that the reinforcement of the specimen belongs to the suitable range of reinforcement.The failure mode,ultimate bearing capacity and maximum displacement under static load are analyzed,and the material properties of the model structure concrete are tested,which lays a foundation for further finite element analysis.Then,the finite element numerical model is established and the static strength of the structure is analyzed.The maximum strain,stress and displacement of the structure under extreme load are analyzed,and then the strength and stiffness of the concrete tower tube structure of the wind turbine are discussed.Finally,this paper looks forward to the further research work and direction. |
