格构式钢管混凝土三肢柱风力发电机塔架的受力性能研究-防灾减灾工程及防护工程专业论文.docxVIP

内 内蒙古科技大学硕士学位论文 II II Abstract With the continuous development of the wind power generator, the most commonly used tower, the cone tower, has been unable to meet the height requirements of the wind turbine because of its structural character and transportation limitations. The research group recommended a new type of tower, lattice CFST wind turbine generator tower, which can overcome some of the draw- backs of traditional tower. Based on the 1.5MW cone steel wind turbine generator tower as a reference, designed a lattice CFST three-limb wind turbine generator tower and reduced scale to a model of lattice CFST three-limb tower. Low cyclic loading test research was carried out on the model tower, analyzed the failure mode and characteristic, mechanical properties of the hysteretic behavior, ductility and energy dissipation. Also web-column stiffness ratio, diameter - thickness ratio and slenderness were analyzed as model tower parameters through finite element simulation. The experimental results show that the lateral displacement hysteretic curve shows plump shuttle shape. Specimen has good energy dissipation capacity. In the whole process, as the specimen was not symmetrical, the forward displacement curve was different from the backward one, the forward curve had no magnificent down-section, while the backward had both yield section and down section. The forward ductility parameter was 3.22, while the backward one was 2.70. The process of failure was the bottom pressure web yield, then the deformation wasn’t recovered, other layers was bent deformed around the imagined column bottom, finally the first layer was broke down from the inside until the entire tube broke down, test finished. From the Mises stress analysis of the first layer joint, the largest stress was the crown point and the saddle point of tension web to column intersection, while the smallest stress was the bottom point of the webs and column intersection.Based on the steel and concrete material mod