## 4 Analysis of Experimental Results
### Structural Acceleration Response  
The acceleration time history curves for the fifth storey of the structure under different control modes are compared and displayed in Figure 10. It is observed that the continuity control strategy outperforms the switch mode control, as the acceleration values in all scenarios have been suppressed lower than that from the switch mode control. Moreover, the control effect of continuity mode under rare intensity is found to be better than that under fortification intensity.  
Figure 9: Displacement time history of isolation layer under two earthquake waves and control modes: (**a**) E1-Centro wave under fortification intensity; (**b**) E1-Centro wave under rare intensity; (**c**) Taft wave under fortification intensity; (**d**) Taft wave under rare intensity.  
Figures 11 and 12 show the peak acceleration responses of each structure storey under different earthquake profiles and amplitudes, for both the continuity control mode and switch control mode. Control effects for the El Centro wave and Taft wave are observed to be more significant than the Tianjin wave. In the rare intensity with continuity control mode for El Centro wave and Taft wave, the peak acceleration responses of the fifth storey are reduced by half of the acceleration peak of the input seismic waves. The structure vibration control effect is obvious, and structure response is reduced by 1/3 under the fortification intensity.  
Figure 11: Acceleration peak curves under fortification intensity: (**a**) By continuity control mode; (**b**) By switch control mode.  
Figure 10: Acceleration time history of the fifth floor under continuity and switch modes: (**a**) El Centro wave under fortification intensity; (**b**) El Centro wave under rare intensity; (**c**) Taft wave under fortification intensity; (**d**) Taft wave under rare intensity.  
The reasons for the continuity control being better than the switch control can be attributed to the following displacement response analysis. Under switch control mode the isolation layer displacement is much smaller than that of the continuity control mode. The decrease of displacement makes the energy dissipation of the damper relatively limited to a smaller range. Thus the energy transferred to the upper structure increases, and the resulting acceleration response becomes larger. Meanwhile, the control effect under rare intensity is better than that of fortification intensity. This is because the initial viscous coefficient of the damper is larger. In rare intensity, a greater isolation layer displacement can completely overcome the initial viscous force. The dampers dissipate more energy, and hence, the acceleration response of the upper structure is significantly reduced.  
It is worth noting that the peak acceleration response for the top storey of the structure model in various conditions, compared with other layers, has a large amplification. This does not conform with the control effect of the overall structure [31]. This may be due to the top storey of the structure model having been destroyed in the previous test, thereby the stiffness of the structure is reduced, and the a whiplash effect occurred in the test. The observation after the experiment also verified this hypothesis. Therefore, when the acceleration response is analyzed, the acceleration peak value of the fifth storey is adopted. The peak acceleration response of each structure storey is similar. The displacement response of the superstructure is small compared with the displacement of the isolation layer. This structure of the displacement reaction mainly occurred in the isolation layer, the upper structure close to the overall translational motion.