Abstract: In order to analyze the influence effect of the reinforced span and the adjacent span and the longitudinal prestress loss effect of the CFRP plate reinforcement of the continuous T-beam bridge with different spans, so as to improve the utilization efficiency of the CFRP plate and the reinforcement effect of the T-beam. Firstly, the reinforcement and loading tests of the single-piece reinforced concrete T-beam reinforced by CFRP plate are carried out, and the test results are compared with the finite element analysis results to verify the rationality and accuracy of the finite element model. Then, a numerical model of CFRP plate reinforcement of 5 m×30 m continuous T-beam was established, and the influence of reinforcement effect and longitudinal prestress loss effect of reinforced span and adjacent span were analyzed. Finally, the tensile stress value of CFRP plate is optimized based on the influence matrix method and applied to the 5-span continuous T-beam solid bridge, and the prestress compensation of the 5-span T-beam of the bridge is verified by the load test after reinforcement to meet the design requirements. The results show that the influence law of reinforcement and longitudinal prestress loss of continuous T-beam bridge reinforcement span and temporary span are obvious, and the tensile stress value of CFRP plate can be significantly improved by optimizing the tensile stress value of CFRP plate based on the influence matrix method, and the optimization effect of side span and secondary side span can reach 38.16% and 24.64%, respectively.

Key words: CFRP plate, T-beam reinforcement, reinforcement effect, influence effect, longitudinal prestress loss