A deformation-enhanced particle swarm optimization (DEPSO) is proposed for performance-based design optimization (PBDO) of steel braced frames. The deformation information of structural elements is a sign of material efficiency, but in particle swarm optimization (PSO), such information is directly discarded. In the proposed DEPSO the deformation information is conditionally added to the optimization process of PSO, thus an enhanced searching ability can be achieved. One numerical example is solved using DEPSO and PSO, in which the structural weight is minimized while satisfying given performance requirements. The results demonstrate that DEPSO is capable of finding lighter structural designs than PSO with less computational time.
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