Traditional isolation structure mainly uses plastic deformation and energy dissipation of the main structure to dissipate vibration energy after bending. Therefore, the performance requirements of these areas are particularly important, in which once the problems occur due to certain factors, it will seriously affect the vibration resistance of the structure and even cause serious damage.
The base isolation of the small isolation mounts is to set a sufficiently reliable isolation layer between the superstructure and the top of the foundation of the building to separate the superstructure from the foundation and prevent the vibration wave from propagating to the superstructure so that the vibration energy can be transmitted. Besides, a part of the input structure is absorbed by the energy dissipation component of the isolation layer, so as to achieve the effect of isolation.
According to experiments, if the period of the structure is extended and given greater damping, the acceleration response of the structure will be greatly reduced. At the same time, the isolation layer between the bottom of the superstructure and the top of the foundation can provide greater displacement for the structure. In this way, the superstructure will be close to translation during the earthquake, which greatly improves the safety of the superstructure, which is exactly the principle of base isolation.
The acceleration response of the structure decreases with the extension of the period so that the inertia force acting on the structure decreases. On the contrary, if the period is extended, the displacement response will increase. If the damping device is introduced into the structure of the small isolation mounts, the displacement response of the structure can be reduced and the corresponding acceleration response can also be reduced.
