METHOD FOR CALCULATING FLEXURAL CAPACITY OF PC COMPONENT UNDER INFLUENCE OF BOND DETERIORATION

摘要

Disclosed by the present invention is a method for calculating the flexural capacity of a PC component under the influence of bond deterioration, comprising: evaluating the cracking due to corrosion expansion of concrete under the influence of corrosion and the bond strength of a steel strand, introducing an equivalent bond strength concept to consider the influence of a load crack on bond strength distribution, and establishing a stress expression of the corroded steel strand under the action of the load; introducing a deformation coordination coefficient to quantify the deformation discordance between the corroded steel strand and the concrete, and clarifying the stress and strain distribution regularities in the cross section of a component; and establishing a stress and bending moment balance equation in the cross section of a corroded PC beam, so as to obtain a method for calculating the flexural capacity of a corroded PC beam. The method for calculating the flexural capacity of a PC component under the influence of bond deterioration provided by the present invention comprehensively considers the influences of reduced steel strand sectional area, degraded material, concrete cracking, bond deterioration, load cracking and other factors which are caused by corrosion, and thus has important guiding significance for the evaluation of the residual load bearing capacity of an existing PC girder bridge.