Study on Feed-Forward Control of Base-Isolated Buildings Using Seismic Input Motions

Abstract eng:
This paper focuses on the use of feed-forward control techniques in base-isolated buildings to improve the control performance and efficiency of active response control systems for seismic excitations. Two approaches to feed-forward control are studied. One is optimal feedback and feed-forward control (FBFFC), which makes use of predicted earthquake ground motion before its arrival. The other is input cancellation control (ICC), which is directly derived to cancel the absolute displacement of a base-isolated building at every moment and does not require prediction of the input ground motion. FBFFC is derived as an optimal control problem formulated using absolute coordinates and a control algorithm is derived to reduce the absolute acceleration response. It is found that the duration of the predicted seismic input motion required for FBFFC becomes shorter as control intensity increases, while control performance and the required control force approach those of ICC. Based on these findings, a new control algorithm that combines FBFFC and ICC is proposed. It is expected that this study will contribute to the development of a new approach to feed-forward active control of base isolated buildings.

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