Optimization results are presented for improving energy dissipation capacity of passive seismic control devices under cyclic deformation. The locations and thicknesses of the stiffeners, as well as the aspect ratio, of a shear-type hysteretic steel damper are optimized to improve energy dissipation capacity under static cyclic deformation. A general-purpose finite element software package is used for elastoplastic analysis, and a heuristic optimization algorithm called tabu search is utilized for optimization after discretization of variables into integer values. The objective function is the dissipated energy before the maximum value of equivalent plastic strains among all elements reaches the upper bound under the prescribed loading condition, and constraints on reaction force and moment are incorporated by penalty function approach. The material parameters of the low-yield-point steel are identified through optimization also using tabu search.
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