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This paper examines a newly developed seismic force-resisting system. To achieve improved seismic performance, the strongback system combines aspects of a traditional concentric braced frame with a mast to form a hybrid system. The mast acts like a strongback to help resist the tendency of concentric braced frames to concentrate damage in one or a few stories during severe seismic excitations. The purpose of the strongback system is to promote uniform story drifts over the height of a structure. For this purpose, in this paper, the design principles for achieving the desired goal, along with a new relationship for controlling the amount of story drift uniform index for this system is presented and the nonlinear dynamic behavior of structures 3, 6 and 12 stories with three seismic force-resisting system with different configuration at the intersection of the braces to the beam under seven acceleration of far and seven …