403916.fig.004a
(a) Flexural frame
403916.fig.004b
(b) X-braced frame
403916.fig.004c
(c) ODBS braced frame
Figure 4: The sequence of formed plastic hinges in various six-story reinforced concrete frames under equivalent Tabas general response spectrum: (a) the flexural frame (left), (b) retrofitted frame by X-bracing system (center), and (c) retrofitted frame by ODBS.