FLEXURAL CAPACITY OF CORROSION-DAMAGED RC BEAMS

A model of the flexural capacity of the corroded reinforced concrete (RC) beam is present. In this model, degradation of the properties of the materials and deterioration of bond between concrete and rebar are considered. According to the equilibrium equations at the cross section of beam and the compatibility of deformation of the rebar and concrete, the differential equation of the axial action of the longitudinal bar is established. The boundary condition of bond-slip action and the continuous boundary conditions of rebar axial force in the above differential equation are given. Limit states, with both concrete crush and rebar yield, of the bending failure of the beam are defined. The model is verified by comparing the experimental data, and the calculation results are in good accordant with the experimental results. At last, the influences of diameter of the longitudinal tension bar, yield strength of the longitudinal tension bar, concrete cover thickness and concrete compression strength on the flexural capacity of the corroded RC beam are analyzed.