%0 Journal Article
%T Designing Variable Stiffness Semi-Active Tuned Mass Damper for Nonlinear
Structures
%J Amirkabir Journal of Civil Engineering
%I Amirkabir University of Technology
%Z 2588-297X
%A Mohebbi, M.
%A Bakhshinezhad, S.
%D 2017
%\ 07/23/2017
%V 49
%N 2
%P 347-362
%! Designing Variable Stiffness Semi-Active Tuned Mass Damper for Nonlinear
Structures
%K Variable stiffness semi-active tuned
%K mass damper
%K Non-linear structures
%K Semi-Active Control
%K Clipped optimal control algorithm
%K Modified balance control algorithm
%R 10.22060/ceej.2016.704
%X In this paper, designing variable stiffness semi-active tuned mass damper (SATMD) formitigating the responses of nonlinear structures under earthquake excitation has been studied. Two semiactive control algorithms based on instantaneous optimal control and clipping control concept as well asmodified balance control have been developed to determine the optimal stiffness of SATMD for nonlinearstructures in each time step. For determining optimal parameters of semi-active control system includingthe weighting matrices in performance index of control algorithm as well as the maximum and minimumvalues of SATMD stiffness, an optimization problem for minimization of structure maximum response hasbeen defined where genetic algorithm (GA) has been used for optimization. For numerical simulations, aneight-story nonlinear shear building with bilinear hysteresis behavior has been subjected to a white noiseexcitation and optimal SATMDs have been designed. The results showed that optimal variable stiffnessSATMD using both control algorithms has been effective in suppressing the seismic responses of nonlinearstructure. Also, variable stiffness SATMD shows better performance than TMD and variable dampingSATMD in structural response controlling. Comparing the performance of the variable stiffness SATMDunder testing earthquakes which were different from design record, showed that the efficiency of SATMDdepends on the characteristics of excitation, hence design record needs to be chosen properly.
%U https://ceej.aut.ac.ir/article_704_efc7d3b6cd5703321aba7a92dbcf178b.pdf