Optimal Structural Control Considering Soil-Structure Interaction Effects

摘要

In this report, a methodology is developed to include soil-structure interaction(SSI) effects in the optimal control algorithms. The major difficulty in including soil-structure interaction in optimal structural control comes from the fact that the accurate analysis of an SSI system is usually formulated in the frequency domain due to the frequency-dependent foundation impedances, whereas conventional optimal control problem is performed in the time domain. This difficulty is eliminated in the proposed methodology by utilizing an equivalent fixed-based structural model to represent the actual SSI system. The control effectiveness of considering soil-structure interaction is investigated for both the single degree of freedom (SDOF) and multiple degree of freedom (MDOF) structural models and for externally and internally controlled systems. For the general MDOF structural models and real earthquake excitations, it is found that the control algorithm considering SSI effects is more effective than the corresponding control algorithm assuming a fixed-base system model. In addition, the advantage of applying this methodology is observed to be more prominent in the cases where the SSI effects are more significant.