A new design strategy to control the torsional seismic response of isolated asymmetric-plan systems by using dissipation devices is herein presented. Effects of the plan-wise distribution of supplemental damping on torsionally dynamic behaviour have been investigated by using modal analysis techniques in the state space representation. Numerical analysis leads to the optimal plan-wise allocation of damping resources on varying the dynamic characteristics of the asymmetric-plan system. Results are verified by both applying H2 and H norm methods and numerically integrating the dynamic equations to recorded seismic events.
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