Typhoon Damage Patterns and Reinforcement Measures Analysis of Distribution Lines

This study investigates three commonly used pole types: Z-M-12 single-circuit straight cement poles, GZ23–19 straight steel tube poles, and JL-120 bare conductors. Three-dimensional simplified models of the poles and overhead conductors were constructed, and finite element simulations were performed using COMSOL. Structural weak points in the pole bodies and flange plate ribs of both the cement and steel poles were identified. Reinforcement designs targeting these vulnerable points were proposed, followed by 3D modeling and finite element simulations to evaluate the stress distribution changes before and after reinforcement. The proposed reinforcement scheme increased the wind speeds at which concrete poles reached tensile strength stress by 2.6 m/s under frontal wind and 5.6 m/s under lateral wind, enhancing wind resistance by approximately 11% and 23%, respectively, with an associated cost increase of around 777 yuan. For steel poles, the maximum stress reaching yield strength under frontal and lateral winds decreased by approximately 27% and 29%, respectively, following reinforcement, with an associated cost increase of approximately 350 yuan.