What is the most commonly used base isolation system in engineering at present?

Commonly used structural isolation devices are generally composed of rubber isolation bearings, sliding friction isolation bearings and viscous isolation bearings. Structural isolation systems can be classified as follows:

(1) Base isolation: Install a base isolation system between the foundation and the superstructure to prevent the earthquake from transmitting to the superstructure and reduce the damage caused by the earthquake. This method is suitable for large-capacity and large-scale high-rise buildings, and is also widely used in engineering at present.

(2) Floor isolation: that is, an earthquake system is installed between the floors of the superstructure on the foundation. This method is suitable for the reconstruction of dangerous buildings and seismic strengthening projects, and is widely used in bridge engineering.

(3) Suspension isolation: all or most of the mass of the structure is suspended to prevent the ground earthquake from being transmitted to the main structure and play a role in isolation. This method is used for some structures with special seismic requirements.

(4) Local isolation: A isolation system is installed between the structure requiring local isolation and the main structure to reduce the seismic response of the local structure. This method is suitable for structures with important equipment, equipment and communication equipment, and is not suitable for other isolation methods.

Extended data:

There are two basic rules for the response of structures to earthquakes.

(1) Although the frequency components of earthquakes are complex, seismic energy is usually concentrated in this frequency range.

(2) The greater the attenuation of the structure, the smaller the seismic response of the structure.

Seismic equipment must also meet some requirements.

(1) has certain flexibility, which can prolong the structural period and reduce the seismic force.

(2) Energy consumption capacity. This can reduce the relative deformation on the supporting surface and control the displacement response of the structure within the design tolerance.

(3) It has constant stiffness and yield strength, and the structure yields under normal load (wind, braking force, etc.). ) and will not produce harmful vibration, thus maintaining good working performance.