Deformation limit states for corroded reinforced concrete beams and columns

Abstract

Since deformation quantities have become principal design consideration in performance-based seismic design (PBSD), it is necessary to evaluate the deformation behavior of corroded RC structures for life-cycle oriented PBSD philosophy. Firstly, the material strain-based criteria to classify the performance limit states of RC beams and columns were proposed. Numerical analysis of corroded RC beams and columns in a wide range of design parameters was performed with the aid of ABAQUS finite element analytical program to evaluate the deformation behavior of corroded RC members. It is found that the corrosion ratio of reinforced bars has little effect on the deformation capacity of corroded RC members with low corrosion ratio. RC beams and columns with high corrosion ratio could fail due to the deterioration of bond between the concrete and longitudinal reinforcement, which induces significant degradation of deformation capacity of the structural member. The statistical characteristic values of deformation indexes corresponding to individual performance limit state of corroded RC beams and columns were obtained based on numerical analysis results. The research results can be utilized for life-cycle oriented seismic performance evaluation and design of RC structures.