Adaptive Control of Tall Buildings under Seismic Excitation

The effectiveness of an adaptive control strategy to control the performance of tall buildings under seismic loads is investigated in this study. The adaptive controller used in this research is based on the simple adaptive control method (SACM), which is a type of direct adaptive control approach. This method is applicable to multi-input multi-output systems. Also, it does not depend on plant parameter estimates. The SACM requires less prior knowledge of controlled structural systems. In addition, it is practical for online control of large-scale structures. These characteristics show that the SACM can be an appropriate method to control tall buildings with many degrees of freedom. The objective of the SACM is to make the plant, the controlled system, track the behavior of the structure with the optimum performance. In this study, the response of a 20-story building is controlled by a direct adaptive control strategy using ideal active devices. The SACM is employed to obtain the required force which results in the optimum performance of the structure. Time-history analyses of the 20-story building are performed to evaluate the performance of the adaptive controller. The SACM performance is compared to the performance of LQR. Results show that SACM can successfully improve the seismic response of controlled buildings against external loadings.

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