Elastic-plastic Seismic Analysis And Design Of Large-scale Wind-driven Generator Tower

With the wind turbine becoming large,the problem in tower designed increased quickly. In order to reduce the cost ,decrease the weight and increase the safety of tower, we need for discussing tower's design. In the course of the studying of the tower,people put much energy in performance of the wind tower, but neglected to study the seismic performance of tower. Earthquake zone in the tower would adversely affect the safety of the tower. Second, the kind of Wind turbine tower structure is too few, there only is the cone tower, this tower use more steel and more cost.This article base on the geometric characteristics of the tower and force characteristics, establishes the 62.4m height of the finite element model of cone tower. Reference to the tower, author design Concrete-filled steel tube 3 limbs column tower, and establish finite element model of the tower. The two towers are carried on elastic-plastic analysis by SAP2000 software.Under rare earthquake, the majority region of the cone tower of stress is less than 220Mpa, great stress region is only at the top of the tower, the openings near the bottom, and the stress has reached 380 Mpa. Displacement at the top of the tower is to reach 1.24m, is about the height of tower 1 / 50 (1.25m), meet the 7 degrees seismic requirements of the region.Under rare earthquake, the concrete-filled steel tube 3 limbs column tower of the majority of bars are in the elastic stage, only a small number of bars in the top and the bottom are into the plastic phase. In the post-seismic displacement at the top of tower is 1.1m, is slightly less than the tower height of 1 / 50 (1.26m), meet the 7 degrees seismic requirements of the region.In the concrete-filled steel tube column 3 limb tower's design, the control factors is the width at the bottom edge and the components size. When width at the bottom edge is height of 1 / 10 the tower, the steel is at least; (Than the original cone tower is to save 76%) deformation also meets the requirements of the normal work of wind turbines simultaneously.The work of this paper may provide wind turbines concrete-filled steel tube 3 limbs column tower's design with some suggestions and recommendations.