Optimum Design Of Extra-high Voltage Steel Tower

In recent years, steel tower structure is used to build most towers with large load in developed countries for it has a better aerodynamic performance, mechanical isotropic, cross-section flexural stiffness and high pressure stability. Therefore, steel components are adopted to build the high-voltage transmission towers not only can reduce the tower wind load, but also balance the mechanical properties and reduce the length of the bar and improve the stability of components. But there are many problems. Transmission towers need to bear the wind-induced vibration, earthquake and other natural disasters, and once the tower structure can not meet the strength requirements, it will be broken. In order to ensure adequate safety margin, the amount of structural material will increase, so the project will cost much more. Therefore, we need to optimize the structure for transmission towers. The main contents are as follows:This paper first makes a brief introduction to the basic concepts of transmission tower structure, the basic idea of modeling, and the establishment of equilibrium equations and a finite element model, and the analysis of mechanical characteristics. Under the role of the wind load, ANSYS finite element software is applied to analyze the model of transmission tower, the mechanical characteristics and the stability of the tower.In the premise of structural safety requirements, we consider the lowest level of maximum stress of the tower as the optimization objective and the structure of the cross-section dimensions as design variables and adopt the orthogonal experimental design to establish the orthogonal table by regarding the diameter of steel tube, the Slenderness Ratio and Diameter-Thickness Ratio as independent variables. By the Analysis of variance to the Results of different parameters, we can get the dimensions of Cross-section of the tower.In this paper, the analysis of the tower by finite element analysis software and optimum design to the cross-sectional area of the tower not only provide a reference for practical engineering applications, but also play an important role in optimum design of the tower.