Seismic Isolation Rubber Bearing is an engineered structural component designed to reduce seismic forces transmitted to buildings and bridge structures. Installed between the superstructure and the foundation or substructure, the bearing allows controlled horizontal displacement while supporting vertical loads.
The bearing is manufactured by vulcanizing multiple layers of high-quality elastomer with internal steel reinforcing plates. This laminated structure provides high vertical stiffness while maintaining horizontal flexibility, enabling the structure to effectively isolate ground motion during earthquakes.
Seismic isolation rubber bearings help dissipate seismic energy, reduce structural acceleration, and protect key infrastructure such as bridges, buildings, and transportation systems.
Structural Composition
A typical seismic isolation rubber bearing consists of:
- Upper connection plate
- Upper sealing plate
- Laminated rubber layers
- Reinforcing steel plates
- Protective rubber layer
- Lower sealing plate
- Lower connection plate
For lead core isolation bearings, one or multiple lead cores are embedded in the center of the bearing to increase damping performance.
During seismic motion, the rubber layers undergo shear deformation while the lead core dissipates energy through plastic deformation, allowing the structure to return to its original position after the earthquake.
Key Advantages
- Excellent seismic energy dissipation
- High vertical load-bearing capacity
- Large horizontal displacement capability
- Effective reduction of structural vibration
- Stable mechanical performance under cyclic loading
- Long service life with minimal maintenance
Product Types
Seismic isolation rubber bearings are generally divided into two main categories.
Lead Rubber Bearing (LRB)
Contains one or more lead cores embedded inside the rubber layers.
The lead core increases damping capacity and effectively absorbs seismic energy.
Lead-free Natural Rubber Bearing (LNR)
Does not contain a lead core and relies on rubber deformation to accommodate structural movement.
Suitable for structures requiring basic seismic isolation performance.
Basic Technical Specifications
|
Item |
Specification |
|
Product Name |
Seismic Isolation Rubber Bearing |
|
Structure |
Laminated Rubber with Steel Reinforcement |
|
Types |
LRB / LNR |
|
Function |
Seismic Isolation & Energy Dissipation |
|
Installation |
Bridge or Building Isolation System |
|
Design |
Custom Design Available |
Applications
Seismic isolation rubber bearings are widely used in infrastructure and structural engineering projects:
- Highway bridges
- Railway bridges
- Urban flyovers
- Public buildings
- Hospitals and emergency facilities
- Government buildings
- Infrastructure in seismic zones
FAQ
Q1: What is the function of a seismic isolation rubber bearing?
A: It reduces earthquake forces transmitted to structures by allowing controlled horizontal movement.
Q2: What is the difference between LRB and LNR bearings?
A: LRB bearings include a lead core for additional damping, while LNR bearings rely mainly on rubber deformation.
Q3: Can the bearings be customized for specific projects?
A: Yes. Size, load capacity, and displacement requirements can be designed according to project specifications.
Q4: Where are seismic isolation rubber bearings commonly used?
A: They are widely applied in bridges, buildings, and critical infrastructure located in seismic regions.
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