This device transfers vertical loads and allows rotational movement through a laminated rubber bearing with an embedded lead plug. During an earthquake, the plastic deformation of the lead plug dissipates seismic energy, controls displacement, and transfers the remaining horizontal force to the pier. In addition, the shear deformation of the laminated rubber accommodates horizontal displacement.
Main Materials: Rubber + Lead
(Patented Technology)
This technology features a structure in which two secondary reaction components secure the lead core inside the upper and lower reinforcing plates, preventing the lead core from being separated or dislodged. As a result, it can resist secondary reaction forces in the vertical direction and accurately transmit the design horizontal force in the horizontal direction, thereby enhancing structural safety under seismic loading.
Compared with products offering equivalent performance, this technology provides:
155% higher yield strength
111% higher fracture strength
9.8% cost reduction
overview
It yields easily against temperature loads, which are classified as long-term loads, and transmits a small horizontal force due to temperature loads on the bridge top plate to the piers. Exhibits great rigidity and suppresses displacement.
As for the seismic load, the lead completely yields, increases the natural period of the structure, reduces the magnitude of the seismic force, absorbs the vibration energy of the bridge top plate into the nonlinear behavior of the lead, and suppresses the vibration of the bridge top plate. Suppress.
Slide LRB applied (Patent No. 10-0879364)
Slide LRB support
pedestal layout
Issues when applying the monolithic LRB base
Rubber-based struts are struts that undergo shear deformation due to constant temperature and earthquake displacement.
When applied, it occurs when the size of the support must be designed to be large due to the stability against buckling of the rubber and the allowable acupressure area.
Slide LRB
There is no shear deformation in the drawing direction, and displacement is accepted on the sliding surface.
For the transverse direction, the LRB base is designed to undergo shear deformation.
