Active optimal control of SSI system based on the finite element model of SSI system and shaking table test study

摘要

In this paper, a LQG controller based on the finite element model of SSI system is established to optimally control the responses of SSI system. Substructuring analysis is used to reduce the system into a smaller set of DOFs system to design the active controller, which includes the complete informations of SSI system. Furthermore, the influence of the boundary condition and the depth of soil layer on control effectiveness are investigated using the proposed method. The results show that different boundary conditions can get almost same control effectiveness, but depth of soil layer will influence the control effectiveness. Finally, the standard two-floor shear structure with SSI effects used as the model, and AMD controller strategy designed based on the proposed method is validated through a serial of shaking table tests, which further verify the proposed method, results show that the proposed method can more effectively control the responses of SSI system than that designed based on the lump-parameter model does.