The traditional passive base isolation is the most widely used method in the engineering practice for structural control, however, it has the shortcoming that the optimal control frequency band is significantly limited and narrow. For the seismic isolation system designed specifically for large earthquakes, the structural acceleration response may be enlarged under small earthquakes. If the design requirements under small earthquakes are satisfied, the deformation in the isolation layer may become too large to be accepted. Occasionally, it may be destroyed under large earthquakes. In the isolation control system combined with rubber bearing and magnetorheological (MR) damper, the MR damper can provide instantaneous variable damping force to effectively control the structural response at different input magnitudes. In this paper, the control effect of semi-active control and quasi-passive control for the isolation control system is verified by the shaking table test. In regard to semi-active control, the linear quadratic regulator (LQR) classical linear optimal control algorithm by continuous control and switch control strategies are used to control the structural vibration response. Numerical simulation analysis and shaking table test results indicate that isolation control system can effectively overcome the shortcoming due to narrow optimum control band of the passive isolation system, and thus to provide optimal control for different seismic excitations in a wider frequency range. It shows that, even under super large earthquakes, the structure still exhibits the ability to maintain overall stability performance.

Given the limitation that the base isolation technology is easy to overturn and collapse in the application of high-rise structures, and at present, high-rise structures also need an isolation control system that can effectively control the structural response under earthquake to reduce seismic damage. Combined with the advantages of friction pendulum system (FPS) and inter-story isolation technology, the friction pendulum system inter-story isolation technology is proposed and applied to high-rise structures. Based on the 20-story benchmark model, the parametric analysis of the friction pendulum system inter-story isolation structure is carried out. Firstly, based on the theoretical model of friction pendulum system, the structural motion equation of friction pendulum system inter-story isolation structure is proposed and the simulation model of the system is established by MATLAB/Simulink. The effects of slideway radius, friction coefficient, and structural damping ratio on the objective function are studied. The results show that the energy consumption ratio of friction pendulum system decreases with the decrease of mass ratio of superstructure to lower structure. The change of top floor acceleration tends to be smaller at both ends and larger in the middle with the increase of mass ratio. The slideway radius does not affect the frictional energy consumption of the friction pendulum system and the base shear ratio of the structure. With the decrease of damping ratio and friction coefficient, the energy consumption of the structure itself increases.