What materials are used in seismic isolation bearings

Seismic isolation bearings are usually composed of the following main materials:

1. Rubber: This is one of the most commonly used materials in seismic isolation bearings, especially natural rubber and synthetic rubber. Rubber has high elasticity, good fatigue performance, and significant damping characteristics, which can effectively absorb and dissipate seismic energy.
2. Steel plate: Steel plates are usually alternately stacked with rubber layers to form the skeleton of rubber isolation bearings, increasing the strength and stability of the bearings while also improving their tensile and compressive capabilities.
3. Friction materials: In sliding isolation bearings, friction materials (such as polytetrafluoroethylene, stainless steel plates, etc.) are used to provide friction on the sliding surface, which can dissipate energy during earthquakes.
4. Reinforcement: In some seismic isolation bearings, especially in high-rise or important buildings, reinforcement may be used to enhance the bearing capacity and stability of the bearings.
5. Adhesive: Used to bond rubber layers and steel plates, ensuring that they do not delaminate or peel off when subjected to seismic forces.
6. Protective layer material: In order to prevent rubber aging or corrosion, the outer surface of the seismic isolation bearing may be coated with a layer of protective material, such as UV resistant coating, anti-corrosion coating, etc.
7. Other materials: In some specially designed seismic isolation bearings, other materials such as high-strength plastics, special alloys, etc. may also be used to meet specific seismic isolation requirements.