In this study, we investigate the effect of restoring force characteristic of column bases on seismic responses in each story of steel frames. Dynamic analyses are carried out on column bases with a kinematics-hardening-type restoring force characteristic or a slip-type restoring force characteristic. The results indicated that, on the first story, the maximum story drift angle of slip-type is larger than that of the kinematics-hardening-type while, on the second story, they are similar. And on any story above the third, the kinematics-hardening-type is larger than the slip-type. In addition the predicitons of the maximum story drift angle of the first story are proposed in the case of the column bases having each restoring force characteristic with energy balance principal.
