OPTIMUM PARAMETERS OF TUNED MASS DAMPERS FOR SEISMIC APPLICATIONS USING CHARGED SYSTEM SEARCH

Abstract

In this paper, optimum parameters of Tuned Mass Dampers (TMD) are determinedto minimize the dynamic response of multi-story building systems under seismic excitations.Charged System Search (CSS), as an efficient optimization algorithm, is revised and applied fortuning passive mass dampers. A MATLAB program is developed for numerical optimization andtime domain simulation. Optimization criteria are the peak values of the first story displacementwith and without TMD, and the transfer function from input ground acceleration to the first storyacceleration response. An alternative formulation is also presented for solving state spaceequations. Compared to other population-based meta-heuristics, the charged system search has anumber of advantages distinguishing this algorithm from the others. However, for improvingexploitation (the fine search around a local optimum), it is hybridized with HS that utilizes chargedmemory (CM) to speed up its convergence. To ensure good performance of this approach, somenumerical considerations are conducted to verify the effectiveness and feasibility of the presentedapproach.