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This is an analytical investigation about bi-axial and uni-axial restoring force characteristics of the same reinforced concrete section. Restoring force-accumulated plastic deformation relation, hysteretic energy absorption capacity and the ductility of the section were compared between the case that the section was under bi-axial curvature history and the case that the same section was under uni-axial curvature history. A lot of cases were analyzed with the various parameters. It was found that bi-axial and uni-axial restoring force characteristics of the same section are strongly affected by axial load and that there is a significant difference on the aseismic performance of the reinforced concrete section between the case that the section is under bi-axial curvature history and the case that the same section is under uni-axial curvature history.
Kobayashi et al. (Thu,) studied this question.