摘要：The buckling resisting brace(BRB)is an efficient system against lateral loads that enjoy high seismic energy absorption *** desirable behavior of BRBs has been confirmed,the stiffness of the system is not desirable that it can be compensated by changing the configuration of BRB *** so doing,the configuration in the form of double K(DK)is investigated to achieve more favorable ***,the required mathematical formulas were proposed to design the *** of DK system with other conventional BRB showed that the DK system has a better structural performance and is more economical(due to needing less core area)than other conventional *** results indicated that the DK system increases the lateral ultimate strength,lateral nonlinear stiffness,and energy ***,the DK configuration reduces the axial forces created in columns in the nonlinear *** material demand,created forces in the main frame,and also increasing of nonlinear stiffens by DK improve the structure’s safety.