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Brief Introduction

LRB is the elastomeric bearing to absorb and scatter the horizontal energy generated during earthquakes. LRB solves problems for temperature dependency, durability and repeated loads by inserting a leadcore into the bearing composed of rubber and steel plate. Moreover, LRB improves functions of the elastomeric bearing by inserting Lead Protecting Rings

Feature

- LRB can resist against short-term weights such as wind power or braking load by utilizing the elastomeric stiffness of lead. It has stability against all time weights. It easily adjusts to slow displacement such as temperature displacement and does not deliver large weights to the lower structure
- By using the plastic deformation property of lead, it absorbs and scatters earthquakes energy.
- It can restore its original position after earthquakes are stopped. No additional repair or maintenance required.
- LRB is the most frequently used bearing for earthquakes.
- From the functional perspectives of a bridge, it supports excellent design of a continuous bridge.
- The lead molecules that experience earthquakes revert to the original molecular structure at room temperature.
- The reverting power of rubber does not generate residual displacement after earthquake.
- LRB is a kind of rubber bearing, it absorbs shock loads to improve the durability of the structure and it is advantageous in the noise.

Function of lead-cored rubber bearing

The rubber in the isolator acts as a spring. It is very soft laterally but very stiff vertically. The high vertical stiffness is achieved by having thin layers of rubber reinforced by steel shims. These two characteristics allow the isolator to move laterally with relatively low stiffness yet carry significant axial load due to their high vertical stiffness. The lead core provides damping by deforming plastically when the isolator moves laterally in an earthquake.