Time delay and saturation capacity interaction in the control of structures under seismic actions

Abstract eng:
For the last thirty years, many structural control concepts have been evolved for the reduction of structural response caused by earthquake excitations, and quite a few of them have been implemented in practice showing that control of structures has a lot of limitations and difficulties in practical implementation. In this paper we discuss the effectiveness of two practical issues, time delay and saturation effect, on the performance of control devices. Their influence, both separately and in interaction, to the response of structures controlled by a modified pole placement algorithm, developed by the authors, is investigated. The above approach is demonstrated by means of numerical examples, where one story building is analyzed under dynamic loads such as harmonic signals and actual seismic events. Conclusions regarding the choice of the control system based on its delay and the maximum capacity of the control devices are drawn.

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