The PC member bending capacity calculation method under the influence of bonding deterioration disclosed by the present invention evaluates the bonding strength of concrete corrosion expansion cracks and strands under the influence of corrosion and introduces the concept of equivalent bonding strength, taking into account the influence of load cracks on the bonding strength distribution to construct the stress equation of the corroded strand under load; Quantifying the strain mismatch between the corroded strand and concrete by introducing the strain harmonic coefficient to determine the stress and strain distribution discipline in the member cross section; By constructing the stress and bending moment balance equation in the cross section of the corroded PC beam, the method of calculating the corroded PC beam bending capacity can be obtained; The method of calculating the bending capacity of a PC member under the influence of bonding deterioration provided by the present invention can integrally consider the effects of factors such as reduction of the cross-sectional area of strands due to corrosion, deterioration of materials, cracks in concrete, deterioration of bonding, and cracks under load. It can have an important guiding effect in the evaluation of the residual capacity of the beam bridge.
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