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Fig. 7

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Results of the top floor of the structure for the 1999 Chi-Chi earthquake (a) displacement response of the uncontrolled structure (b) Comparison of the time history of the displacement due to clipped optimal LQR and modified LQR (c) Variation of control weighting matrix R with time(d) Comparison of the time history of the force of clipped optimal LQR and modified LQR (e) Cumulative energies of the top floor of the modified controller and clipped optimal LQR controller.

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