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Seismic Rubber Bearings
Earthquakes are one of the most destructive natural disasters known to man. The conventional approach to protect structures is to strengthen them so that they do not collapse in an earthquake. For low to medium rise structures this approach is not effective because the natural frequencies of these structures are within the range of damaging earthquake frequencies which results in an increase in the forces entering the structures.

An alternative method, known as base isolation, decouples the structures from the earthquake forces and provides protection for both the structures and contents. Among numerous designs of base isolation systems available today, high damping natural rubber bearings (HDNR) offer perhaps the simplest and the most cost effective method of isolation and are relatively easy to manufacture.

Rubber-steel laminated bearings for seismic isolation are designed to provide sufficient vertical stiffness to support the load of the structure and at the same time flexible in the horizontal direction so as to accommodate the ground motion due to the earthquake. Rubber-steel laminated bearings are designed to give a mounted structure a horizontal natural frequency down to 0.4 HZ (corresponding to a period of 2.5s).

Advantages of Steel Laminated Rubber Bearings over mechanical structural support system are:
  • Simple design
  • Less or no maintenance is required
  • No moving parts
  • Resistant to environmental hazards
  • Economical
  • No additional damping mechanism required due to the inherent damping characteristics of the rubber
Manufacturing process
  • Preparation of rubber compound according to required specification
  • Preparation of metal surfaces
  • Application of bonding agent
  • Assembly
  • Compression Moulding and Vulcanisation
  • Performance test
Seismic Rubber Bearings

Devastating effects of 1995 Kobe earthquake
Devastating effects of 1995 Kobe earthquake: All collapsed bridge were installed with steel bearings, bridge with rubber bearings did not collapse

Installed bearings underneath a building
Installed bearings underneath building
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