Effects of prestressing wire corrosion on the load response law and bearing capacity of PCCP

The corrosion of prestressed steel wires plays a crucial role in the failure of prestressed concrete cylinder pipes (PCCP). To explore the load-bearing response of prestressed steel wire corroded PCCP and the impact of prestressed steel wire corrosion on the load-bearing capacity of PCCP, a high-precision finite element model of buried PCCP with prestressed steel wire corrosion was established, and a bearing test was conducted based on this model. The results show that the corrosion of prestressed steel wires has the greatest impact on the mortar protective layer and outer core concrete, and the corrosion point at the waist of the pipe is the most detrimental to the pipeline. In addition, as the degree of corrosion of the steel wire increases, the mortar protective layer and outer core concrete at the corrosion point first crack under the action of compressive stress and internal water pressure. Finally, it was verified that the constructed bearing capacity model of PCCP with different corrosion points had high accuracy and could be used to predict the bearing capacity of corroded pipelines. This article can provide theoretical support for the structural safety monitoring and repair of PCCP in service.