Abstract
After the Hanshin-Awaji earthquake, large amount of lateral reinforcement is commonly used to improve seismic performance of the RC structures. Although large amount of and closely spaced lateral reinforcement will be effective to prevent elastic buckling of the axial reinforcement, it can hardly prevent plastic buckling. Therefore, under strong earthquake, axial reinforcement will be subjected to the repeated loading of large deformation reversals ranging from tensile plastic region to compressive buckling region. The authors carried out low cycle fatigue test of deformed bars, and examined the failure criterion of them.
