Abstract
This paper quantitatively evaluates the load-carrying and deformational mechanism of RC and SRC columns with solid and hollow cross sections, subjected to axial and cyclic horizontal forces, based on the damage of constitutive materials. The cyclic behavior of RC columns, with various dimensions and under various loading conditions, are fully investigated numerically by using a two-dimensional finite element analysis, with a help of an average normalized accumulated strain energy in core concrete that is newly proposed in this paper, in addition to the ordinary damage indices of concrete together with the index for reinforcement buckling. Moreover, the same target RC columns are also analysed by fiber theory-based frame analysis, with a use of average residual rate of elastic stiffness of concrete in cross section of the columns. Consequently, it is numerically clarified that the lateral load-displacement relationship and the axial force carrying performance of RC columns are governed by the failure of core concrete and the buckling of longitudinal reinforcement.
