EFFECTIVE OPTIMAL STRUCTURAL CONTROL OF SOIL-STRUCTURE INTERACTION SYSTEMS

A methodology is developed in this paper to include soil-structure int eraction effects in optimal structural control, General Multi-Degree-O f-Freedom (MDOF) structural models are considered. The SSI transfer fu nctions for ground motion and control force in the physical space are presented first, followed by a methodology for using system identifica tion techniques to find an equivalent fixed-base model of an MDOF SSI system. An iterative technique is applied to combine these methods for the determination of optimal control gains. The control effectiveness of considering soil-structure interaction is investigated for the con trolled SSI system. It is found that the control algorithm considering SSI effects is more effective than the corresponding control algorith m assuming a fixed-base system model. In addition, the advantage of ap plying this methodology is observed to be more prominent in the cases where the SSI effects are more significant. (C) 1997 by John Wiley & S ons, Ltd.