LRB (Lead Rubber Bearing) is the most widely used and cost-effective integrated seismic isolation device in the fields of architecture and bridges. It achieves structural seismic upgrade through "rubber isolation + lead core energy dissipation".
I. Basic Construction
- Multiple layers of rubber and reinforcing steel plates are alternately stacked and vulcanized
- A high-purity lead core is embedded in the center to provide damping and energy dissipation
- Connecting plates are set at the top and bottom to facilitate anchoring with the structure
- There are two standard shapes: circular and rectangular
II. Working Mechanism
- Vertical load-bearing: The steel plate constrains the rubber, providing stable vertical stiffness
- Seismic isolation elongation period: The horizontal flexibility extends the structural natural vibration period from 0.2–0.5 seconds to 1.5–3.0 seconds, avoiding the main seismic frequency band
- Lead core yield energy dissipation: During an earthquake, the lead core undergoes plastic deformation, equivalent damping ratio can reach 15%–25%, absorbing seismic energy
- Rubber self-resetting: After the earthquake, the rubber automatically resets through elasticity
III. Core Performance
- Seismic response reduction: 60%–80%
- Damping ratio: 15%–25%
- Applicable intensity: ≤9 degrees
- Working temperature: -25℃~+60℃
- Design service life: ≥60 years