Theoretical Research On Base Isolation And Structural Control Considering Soil-Structure Dynamic Interaction

In this dissertation, the theorectical research on base isolation and structuralcontrol considering soil-structure dynamic interaction (SSI) is systematicallyperformed, and the primary innovative work and achievements are included asfollows. (1) The dynamic characteristics and seismic responses of the base-isolatedstructures considering the soil-structure dynamic interaction are investigated. Thedynamic impedance matrix of the continuous and layered soil in space domain isdeduced by the indirect boundary element method. In order to analyze the dynamiccharacteristics of the base-isolated structures considering the soil and structuredynamic interaction, the analytical model and its equations of motion in the frequencydomain for the structures with the rubber bearing isolation and the sliding isolationrespectively are established using the superposition principle and the sub-structuremethod. Then, against the superstructures with larger or smaller stiffness and thedifferent structures, the influence of the stiffness of the superstructure on the level ofsoil-structure dynamic interaction and the influence of the soil-structure dynamicinteraction on the isolation effect of the base-isolated structures with different typesof isolation are numerical simulated. At the same time, the influences of thesoil-structure dynamic interaction on the isolation effect of the base-isolatedstructures with different isolation parameters, by selecting different levels of isolation,different stiffness of retainers and different friction coefficients, are compared. (2) The influence of considering soil-structure dynamic interaction on the controlfor seismic responses of structures is studied. The analytical model in the frequencydomain for the controlled structures is established using the sub-structure method.The influence of SSI on the dynamic characteristics of the structures is numericallysimulated through the generated programe with MATLAB. Using the Fouriertransformation, the equations of motion, the state equations and the control law forthe control systems of the active tuned mass damper (A-TMD), the passive multipletuned mass damper (M-TMD) and the magnetorheological (MR) damper are gainedin the frequency domain. And the influence of considering the SSI on the controleffect of the structures with different control measures is numerically analyzed. (3) The influence of considering structure – basement – piles - soil dynamicinteraction on the control for seismic resonpses of tall building structures isresearched. The equation of motion of the strcutural system considering structure –basement – piles - soil interaction is built, in which the Spline Finite Element Method,the Spline Subdomain Method and the Semi-Analytical Infinite Element Method areadopted to simulate the soil, and the bending-shear model is used for thesuperstructure and the multistory basement. The equations of motion of the controlledtall building structure with the active, the passive or the semi-active control systemsrespectively are eastablished in time domain, considering structure – basement – piles- soil dynamic interaction, and the influence of considering structure – basement –piles - soil dynamic interaction on the control effect of for seismic resonpses of tallbuilding structures is researched. And the influence of considering the structure –basement – piles - soil dynamic interaction on the control effect of the structures withdifferent control measures is numerically investigated. A conclusion is given that the influence of the soil-structure dynamic interationon the base isolation and the structural control must be considered while designingthe base isolation and the structural control for the structures on the soft soil.