Abstract: The damaged angle steel of transmission tower is taken as the research object. Based on the reinforcement and repair technology of carbon fiber reinforced polymer (CFRP) at home and abroad, the method of strengthening angle steel with carbon fiber cloth is proposed. In this method, carbon fiber cloth is pasted onto the surface of angle steel by adhesive for reinforcement. There is no secondary damage to angle steel during the reinforcement process, and the process is simple and practical. By establishing a numerical analysis model of composite structures, the effects of carbon fiber cloth reinforcement thickness, reinforcement layer number, ply angle and reinforcement method on the reinforcement effect of composite members are studied. The results show that the relative improvement of the bearing capacity of the angle steel reinforced with carbon fiber cloth will increase. When using four layers of 0.668 mm thick carbon fiber cloth, the improvement of the ultimate bearing capacity of the angle steel can basically meet the reinforcement demand. When the angle of each layer of carbon fiber cloth is laid in the direction of 0° along the axial compression direction of angle steel, the reinforcement effect can be maximized. Combined with economic considerations, the effect of medium-package reinforcement on angle steel is better than that of full-package reinforcement.

Key words: tower angle steel, carbon fiber reinforced polymer, reinforcement, ultimate bearing capacity