Because of their advantages, Buckling Restrained Braces (BRBs) have been widely used in concentrically braced frames. The core segment of normal BRBs is continued through the total length of the brace and is restrained with an encasing mechanism. Reducing the core length of BRBs causes some improvements in seismic performance of BRBF systems. However, reducing the length of yielding segment in BRBs makes the low-cycle fatigue failure more probable. In this paper, a new step by step design procedure including a special step for preventing low-cycle fatigue failure and another for preventing global buckling was developed for Buckling Restrained Braced Frames (BRBFs) with reduced yielding segments. A typical 5 story building with reduced core BRBs was designed based on the proposed design procedure. Also a previously designed 7 story building with conventional BRBs was re-designed using reduced core lengths. Several non-linear static analyses were performed. Analyses results showed that the recommended seismic design of BRB with reduced core length exhibited desirable performance and satisfies the seismic design objectives