Prestressed concrete cylinder pipe (PCCP) with broken wires needs to be reinforced in time. The strengthening of PCCP that does not allow water delivery interruption belongs to secondary load structures. In this paper, the mechanical properties of prestressed CFRP repair PCCP under secondary load are studied. Firstly, a three-dimensional finite element model is established. Then, the finite element model is evaluated by a full-scale test. The influence of variables (e.g. prestress level, CFRP layers, internal pressure when reinforcement) on the mechanical performance of the PCCP is analyzed. Based on the serviceability limit state, the bearing capacity of the pipe is analyzed. The results show that, when strengthened by CFRP with a width of 500 mm, and prestress of 10.9% under internal pressure of 0.2 MPa, the PCCP can withstand the internal working pressure of 1.0 MPa. Reinforcement under small internal pressure can enable CFRP to participate in the force as soon as possible. Based on the serviceable limit state, the difference in the initial internal pressure has no obvious effect on the bearing capacity of the PCCP.
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