输电塔倒塌失效模式和主材角钢加固方法研究.

In order to improve the ability of transmission towers to resist extreme meteorological disasters in service and ensure the safe and stable operation of transmission lines, a typical 220 kV transmission tower is taken as an example, and the finite element method is used to study its wind resistance ultimate load bearing capacity and analyze the collapse mechanism and damage mode of transmission towers under strong wind. In view of the failure mode of the transmission tower, a non-destructive reinforcement scheme is proposed. By establishing finite element models of angle steel members with different length to slenderness ratios of the main material, the axial compression load capacity of the main material before and after reinforcement is numerically simulated, also the reinforcement design is carried out for the main material of the weak part of the transmission tower, and the ultimate wind bearing capacity of the reinforced transmission tower is studied. The results show that the reinforced main material angle bearing capacity is greatly increased, up to 37.2%. The local stiffness of the weak parts of the transmission tower is improved, the top displacement and the maximum stress of the tower are significantly reduced compared with those before reinforcement, the ultimate bearing capacity of the tower is greatly increased, and the design importance factor of the transmission tower is increased from 1.15 to 1.35. The proposed reinforcement method can provide an important reference for the wind resistance reinforcement design of the same type of transmission tower. [ABSTRACT FROM AUTHOR]