Abstract：Abstract：Research purposes：Externally bonded (EB) fiber reinforced polymer(FRP) method has some shortcoming, such as poor intensity of utilization of FRP and performance improvements during normal use for reinforced concrete beams. Impose certain initial load on concrete beam first, then the carbon fiber reinforced polymer (CFRP) laminate is prestressed, anchored and pasted in the concrete beam bearing surface, the effect of prestress and initial state of the concrete beam on the bending property of the test beam is studied. Comparison of the bearing capacity, midspan deflection, crack propagation of pretensioned CFRP laminate strengthening member and common CFRP laminate flexural member, feasibility and superiority are pointed out for pretensioned CFRP laminate strengthening method for concrete bridge.
Research conclusions：（1）The pretensioned CFRP can improve the performance of the beams, and enhance yield load and ultimate load by 15.5% and 10.5% compared with RC beam strengthened with externally bonded CFRP laminate under sustained loading.（2）Displacement ductility is slightly lower than the benchmark beam without reinforcement.（3）The crack spacing of pure bending section is relatively smaller, which can effectively inhibit the expansion of the crack, improve the concrete beam using stage performance.（4）The research results can provide references for RC girder strengthening study and application.
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