Research On Elastoplastic Failure And Reinforcement Technology Of Transmission Tower Line Structure Under Severe Typhoon

Typhoons occur frequently in the southeast coastal areas of my country.When a typhoon passes,accidents of high-voltage transmission towers caused by typhoons often occur in Fujian,Guangdong,Zhejiang,Taiwan and other regions.The power transmission tower collapses,and the power supply energy is immediately reduced,directly affecting economic production activities,affecting the convenience of people’s lives,and having a great social impact and causing losses to the national economy.Therefore,this paper studies the response and destruction process of the transmission tower under the action of a strong typhoon,tries to find out the law of the tower collapse of the transmission tower under the action of the typhoon,and conducts targeted reinforcement technology research.First of all,this article investigates the damage of power transmission towers caused by strong typhoons in my country in recent years,and the forms of damage to power transmission towers,and summarizes the reinforcement measures for power transmission towers at home and abroad.Then,according to the Davenport wind speed spectrum,using linear autoregressive filter technology and considering the spatial correlation,a program for simulating typhoon wind speed was compiled in MATLAB software,and the wind speed time history curves of different heights of the tower body consistent with the target power spectrum were obtained.Then,a finite element model of the transmission tower was established,and the modal experimental data of the model tower was used to verify the modeling method and material parameters of the finite element model,and the reliability of the modeling method was verified.Then,according to the transmission line design specifications,the static electricity of the transmission tower under different wind speeds(30m/s,40m/s,50m/s)and different wind direction angles(0°,30°,60°,90°)The force response is analyzed,and the calculation results show that: 30m/s wind speed does not pose a threat to the safety of the transmission tower;under the conditions of 40m/s wind speed and 60° wind direction angle,the main material of the tower body undergoes plastic deformation,posing a threat to the safety of the transmission tower;50m/s Under the condition of s wind speed,the main material of the tower body reaches the limit of bearing capacity and is damaged.Subsequently,dynamic wind load was applied to the transmission tower,and the dynamic response analysis of the transmission tower was carried out.The calculation results showed that: when the basic wind speed is 30m/s,the transmission tower material is basically in the elastic deformation stage,which has no effect on the safety of the transmission tower;when the basic wind speed When it reaches 50m/s,the legs of the tower body buckle and fail,and then the tower collapses.Finally,in view of the damage characteristics of the transmission tower,this paper proposes a self-supporting transmission tower internal cable reinforcement technology,and compares multiple schemes.The calculation results show that the reinforcement measure can effectively improve the rigidity of the transmission tower itself and can significantly reduce wind vibration.In response,a good reinforcement effect was achieved.