en Optimal design Optimal design پژوهشي Research In this research, a new objective function has been proposed for optimal design of the Buckling Restrained Braced Frames (BRBFs) is performed using nonlinear time history analysis. The BRBF is a particular type of bracing system that has been widely utilized in recent years. The nonlinear time history analysis also provides a detailed view of the behavior of the structure. The purpose of this study is to provide an optimal design based on minimizing the weight of the structure while increasing the energy dissipation capability of the structure. Due to the complexity of the problem, the Enhanced Vibrating Particles Systems (EVPS) meta-heuristic algorithm is used to perform the optimization. Here, a 3-story frame, a 6-story frame and a 9-story frame are investigated simultaneously considering the continuous and discrete optimization. buckling restrained braced frames, weight optimization, enhanced vibrating particles systems algorithm, structural optimization. 513 529 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-277&slc_lang=en&sid=1 A. Kaveh 180031947532846001656 180031947532846001656 Yes S. R. Hoseini Vaez 180031947532846001657 180031947532846001657 No P. Hosseini 180031947532846001658 180031947532846001658 No H. Abedini 180031947532846001659 180031947532846001659 No