High Damping Rubber Bearing is constituted of a series of vulcanized rubber layers separated by reinforcing steel plates, support vertical load and is receptible to deformation and rotation simultaneously.

In addition, this seismic bearing can control deformations of superstructure and reduce the seismic force which delivered to substructure by viscous damping and friction of rubber molecules due to mixing rubber and viscous materials together.

- Reinforcing Steel Plates : Maximizing capacity to support the vertical load of rubber

- Cover Rubber : Extending life by preventing deterioration

- Upper/Lower Steel Plates : Dispersing stress loaded to rubber

- Inner Rubber : mixing rubber and viscous materials together specially

                        Supplying flexibility horizontally

- Vertical Load : Behaving like common steel bearings

- Wind Load : Resisting by using large stiffness of viscous material (core type)

- Temperature Effect : The change of features caused by temperature change is little

- Rotate : It accommodates rotate by the flexibility of rubber

- It reduces the Seismic load by using viscous material (core type) especially

- Application : Easy applocation due to having all functions as only one equipment

- Durability : Outstanding durability and long life (more 30 years)

                   No damage of HDRB and bridge even if a number of experience design earthquake

- Maintenance : No maintenance due to be able to reuse after earthquake

- Seismic Performance : Having outstanding performance as viscoelastic material at diverse characteristics of earthquake

                                    Having more outstanding damping performance than elastomeric bearing

                                    (Damping Ratio : 10~15%)

- Low hardness : shear modulus 0.8MPa / Damping Ratio 15%

- Mid-hardness : shear modulus 1.0MPa / Damping Ratio 15%

- High hardness : shear modulus 1.2MPa / Damping Ratio 14%

- Vertical Compression Test : Check capacity to support the vertical load (visual inspection)

- Compression Shear Test : Check the isolator performance of bearing (equivalent stiffness, EDC area)

- Shear Fracture Test : Check shear force and strain at breaking point