The design algorithm to obtain superior design solutions (SDSs) of steel office buildings associated with the different-type damping devices such as buckling restrained braces (BRBs) and oil dampers (ODs) is proposed. The SDSs are rational design solutions satisfying practical design constraints with the locally minimized structural cost. The design variables are the section sizes of columns and beams as well as locations and properties of the damping devices. The response history analyses are conducted during the optimization process directly evaluating the damping effect of ODs. The SDSs of 10 and 16-story buildings are derived and the structural properties are evaluated.
