What is the purpose of lead core seismic isolation rubber bearings
Lead core isolation rubber bearings (LRBs) are key seismic components installed between the foundation and upper part of a structure. Their core functions include vertical load-bearing, horizontal isolation, energy dissipation and seismic reduction, post earthquake reset, and protection of buildings and bridges during earthquakes.
Lead core isolation rubber bearings (LRBs) are key seismic components installed between the foundation and upper part of a structure. Their core functions include vertical load-bearing, horizontal isolation, energy dissipation and seismic reduction, post earthquake reset, and protection of buildings and bridges during earthquakes.
core purpose
1. Vertical bearing and stable support
Multi layer rubber and steel plate overlay provide high vertical stiffness, stably withstand the dead and live loads of upper structures such as buildings and bridges, and ensure daily use safety.
2. Horizontal isolation, extending the period
During an earthquake, the rubber layer undergoes significant shear deformation, extending the natural vibration period of the structure (to 1.5-3.0 seconds), avoiding the seismic wave period, and greatly reducing the upward transmission of seismic forces, achieving the goal of "overcoming rigidity with softness".
3. Lead core consumes energy and attenuates vibration
The central lead core undergoes plastic deformation under horizontal shear, converting seismic kinetic energy into thermal energy for dissipation, providing high damping (15% -22%), significantly reducing structural acceleration and displacement, and protecting the main body and internal facilities.
4. Elastic reset to control residual deformation
After an earthquake, the elastic recovery force of rubber combined with the dynamic recrystallization of lead core drives the structure to automatically return to its original position, with minimal residual deformation, making it easy to quickly recover and use after the earthquake.
5. Protect critical structures and reduce damage
Isolate earthquake energy, reduce internal forces and deformations of components such as bridge piers, columns, and shear walls, avoid shear failure, reduce repair costs, and enhance overall seismic safety.
6. Adapt to high-intensity areas and important projects
Suitable for areas with high seismic intensity of 8-9 degrees, widely used in high-rise buildings, hospitals, schools, sports centers, bridges, overpasses, subway roofs, etc., to improve fortification standards and reduce costs (7% -15%).
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