Failure analysis and strengthening study of transmission tower under strong wind
To improve the capacity of service-aged transmission towers to withstand extreme loads and ensure the safe and stable operation of power lines,a non-destructive reinforcement measure is proposed,addressing the failure modes and characteristics of tower damage.The feasibility of the measure is verified through load-ing tests and numerical simulations.Focusing on a typical 220 kV transmission tower,multi-scale analysis methods are used to develop detailed finite element models before and after reinforcement.The dynamic prop-erties of the tower,its nonlinear response to wind loads,and potential progressive collapse modes are simula-ted and analyzed.The effectiveness of the non-destructive reinforcement in enhancing the tower's wind resist-ance is assessed.The results indicate that the reinforcement measure can effectively reduce the wind-induced vibration response and improve the tower's wind resistance performance,with the critical failure wind speed increased from 29.2 m/s to 30.8 m/s.The stiffness of the reinforced sections and adjacent sections is en-hanced,leading to a more uniform internal force distribution.This non-destructive reinforcement measure serves as a reference for improving the ability of service-aged transmission towers to resist extreme loads.
万方数据
维普
