Abstract
The current study investigated the optimum design of buckling restrained braced frames (BRBFs) subjected to seismic excitation. Nonlinear time history analysis was employed to examine the performance of the structures under seismic excitation. The objective function in the optimization problem was defined such that the weight of the structure and the amount of energy dissipated were simultaneously optimized. The search space of the optimization problem consists of discrete and continuous spaces due to the presence of BRBs. The metaheuristic salp swarm algorithm (SSA) and enhanced colliding bodies optimization (ECBO) algorithm were employed to determine the optimum design of the BRBFs having three and six stories. It was revealed that the weight of the BRBs had little influence on the total weight of the structure; however, BRBs could reduce the weight of the structure by maximizing energy dissipation. Furthermore, the ECBO algorithm produced a more efficient optimum design when compared to the SSA.
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