CALCULATION METHOD OF ULTIMATE CURVATURE OF RC AND SRC SECTION BASED ON ANALYTICAL MODEL FOR AXIAL REINFORCEMENT BUCKLING AND ITS APPLICATION TO DUCTILITY EVALUATION OF THESE COLUMNS

Abstract

The method of ductility evaluation of reinforced concrete piers and concrete encased steel piers is examined. The ultimate displacement is defined as the buckling of longitudinal bars inside the cross section. Thus, the ultimate displacement can be calculated with the ultimate curvature based on buckling of bars and the plastic hinge length. Comparison with previous experimental results indicated that the proposed method enables fairly accurate calculation of the ultimate displacement for both of reinforced concrete columns and concrete encased steel columns.