Natural Rubber Bearing(NRB)

Natural rubber bearing that uses natural rubber. It has low damping performance, around 2 to 3% for the equal damping factor. It also features excellent linearity and a stable restoring force. We need a separate damper. You can design with more flexibility by using different damper types and attenuation. Rubber material has four types of elastic modulus: G0.30, G0.35, G0.40, and G0.45. These can support a wide range of column loads.

Natural rubber bearings with steel laminates sit between parts of a concrete structure. They help protect the structure from damage during movements between these components. Rubber bearings have stiffness that depends a lot on their shape. Stiffness relations help design bearings for specific applications.

Applications include:

• Bridge bearings

• Antivibration mountings for buildings

• Rail track mountings for underground railways.

• Foundation bearings for earthquake protection (still under development).

These bearings come from rubber manufacturers. Manufacturers create natural rubber in specific ways. Understanding this and its properties can assist engineers and rubber technologists.

Engineers use two types of dampers with steel rings: continual and separate. They place these dampers between the top and bottom plates. The system calculates its performance features. These include effective horizontal stiffness, energy dissipation, equal viscous damping, and residual deformation. Next, we compare these results to high damping rubber bearings and SMA-lead core rubber bearings (SMA-LRB). The results show that steel rings lose energy mainly through plastic deformation. This happens because of how the rings bend. NRB-SRD shows better performance in energy dissipation compared to SMA-LRB and HDRB.

Natural rubber bearings (NRB) is different from High damping rubber bearings (HDRB). Natural rubber bearings (NRB) provide flexibility and load distribution but offer limited energy dissipation, making them suitable for regions with low seismic activity.

These extra dampers provide better stability and energy dissipation. They connect the structure and substructure. This provides strong stiffness during weak earthquakes and wind loads. They also improve energy dissipation, stability, and secondary stiffening in higher shear strains.