New Evaluation of Soil-Structure Interaction Effects on Optimal Control of Structures

Abstract eng:
A methodology is developed in this paper to include soil-foundation-structure interaction (SFSI) effects in optimal control algorithm LQG. Analysis of a SFSI system is usually formulated in the frequency domain, whereas the optimal control algorithm LQG in the time domain, hence using an equivalent fixed-base model of structure considering SFSI effects represents an effective approach. A system identification technique is applied to find an equivalent fixed-base system. This equivalent model is applied to combine for the determination of optimal control gain. In this study, two illustrative examples of a five-storey building resting on and in elastic half-space are used to investigate the effectiveness of the developed control algorithm LQG. It is shown that the LQG controller considering SFSI effects is more effective in suppressing the structural response in both embedded and surface footing, but requires more control force when foundation is shallow at surface ground. It is shown that the applied system identification in this study is useful for other analyses of structure considering SFSI effects.

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