Study on Mechanical Properties of Press-Bending Members Based on Transmission Towers Diagonal Member Reinforcement In-Situ

According to the reinforcement requirements of load-bearing members of existing transmission tower, a new type of in-situ reinforcement scheme for the angle steel T-shaped composite section is proposed. Through the compression test of 10 groups of members, the influence of slenderness ratio, the number of fixtures, the number of bolt rows and other parameters on the failure mode and bearing performance of members was studied. A simulation model was established using ABAQUS software, the load-displacement curve, failure models and other aspects verify the reliability and validity of simulation results. The results show that when the slenderness ratio of member reaches a certain value, the ultimate bearing capacity of member reinforced with the reinforcement angle steel of same specification and strength can be multiplied and increased several times, the slenderness ratio has little effect on the force transmission efficiency of reinforcement angle steel. The number of bolt rows has a small effect on the ultimate bearing capacity of member, the increase rate of ultimate bearing capacity, the failure mode and the force transmission efficiency of reinforcement angle steel, the influence of strength of reinforcement angle steel, the specification of reinforcement angle steel on the ultimate bearing capacity, and the increase rate of ultimate bearing capacity of member obviously, the higher strength and specification of reinforcement, the greater the ultimate bearing capacity of reinforced member, and the higher the rate of improvement of ultimate bearing capacity, the smaller the thickness of filler plate, that is the smaller the eccentricity, the higher force transmission efficiency of reinforcement. The research results can provide experimental and theoretical basis for the reinforcement of tower structure and engineering design.