Abstract
The chapter presents an analysis on the seismic behavior of dual system incorporating buckling-restrained braces. Moment-resistant frames are considered as backup frames in the chapter. The chapter focuses on the stiffness requirements of backup frames on seismic responses of two different models located in a general site of Japan, subjected to three set ground motions with two different seismic levels. Structural behavior is evaluated from story drift angles obtained through nonlinear time history analyses. Performance of the models shows that to minimize the story drift angles of the dual system, less then 10% of the backup frame stiffness ratio is needed to ensure the uniformity of story drifts. Pure buckling-restrained braced frames have the trend of large drifts and drift concentration after buckling-restrained braces (BRBs) yield; however, a backup frame can decrease the drifts and drift concentration.
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