Study on reinforcement technology of reinforced concrete T-beam by external prestressing tendons

In view of the vertical cracks in the web of reinforced concrete T-beam bridge, the traditional passive reinforcement methods such as pasting steel plate reinforcement and enlarging section reinforcement have the disadvantages of large damage to the original structure and unable to seal the cracks. In this paper, taking 20m reinforced concrete simply supported T-beam bridge as an example, the typical vertical cracks in the web were analysed and reinforced by external prestressing. Finite element software is used to analyse the whole bar system model and local solid model. According to the construction monitoring and reinforcement after load test results, the theoretical analysis and the actual reinforcement effect are in good agreement. The external prestressing not only improves the bearing capacity of the reinforced concrete T beam, but also offsets part of the live load and closes part of the cracks, achieving the design expectation and achieving good reinforcement effect.