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LRB (Lead Rubber Bearing)

Laibin Seismic Isolation Products

ADAPTABLE, EFFECTİVE, SAFE

Lead Rubber Bearing (LRB) constitude the world’s most widespread solution fort he protection of bridges and buildings.

LEAD RUBBER BEARING

LRB, is a kind of seismic isolation bearing that adds one or more lead cores inside a common natural rubber bearing and absorbs seismic energy by relying on the plastic deformation of lead cores.

LRB has a large vertical stiffness that allows it to support buildings stably; besides. it has a small horizontal stiffness that achieves the displacement of the bearing and offers a horizontal restoring force via the shear deformation of laminated rubber. It can be used in the seismic isolation systems alone and adjust damping by regulating the diameter or number of lead cores to offer great design flexibility.

As an effective seismic isolation device, LRB is widely used in residential buildings, office buildings, teaching buildings, hospitals, town halls, museums,factories, etc.

  • THE ABILITY TO TURN THE VIOLENT SHAKING OF THE BUILDING INTO A SLOW MOVEMENT
  • ADJUSTABLE DAMPING CAPACITY
  • HIGH VERTICAL BEARING CAPACITY
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ADAPTABLE, EFFECTİVE, SAFE

Lead Rubber Bearing (LRB) constitude the world’s most widespread solution fort he protection of bridges and buildings.

FEATURES

  • It offers exceptional durability, great fatigue resistance, hot air aging resistance, ozone aging resistance, acid resistance, water resistance, and fire resistance, and its lifespan ranges from 60 to 80 years.
  • It has great vertical bearing capacity that can support buildings stably.
  • Lead cores with great energy dissipation capacity are provided to allow the LRB absorbing seismic energy through the plastic deformation.
  • It prolongs the natural vibration period of the building, reduces the freguency of natural vibration and turns the violent shaking of the building into a slow movement.
  • Damping capacity can be adjusted by regulating the diameter or number of lead cores to offer great design flexibility.
  • Easy to install, maintain and replace, no repair is required after the earthquake and it It aligns itself automatically after an earthquake, bringing great social and economic benefits.
  • LRB can be used in seismic isolation systems alone, especially in engineering projects
  • The addition of lead increases the early stiffness of the LRB to prevent vibrations caused by storms.
  • It has good horizontal deformation capacity and stable elastic restoring force, which allows the LRB maintaining excellent performance after repeated earthquakes and offering exceptional durability and reliability.
  • It offers great seismic isolation effect and can effectively protect the safety of buildings and personnel & devices inside.
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STRUCTURE

Lead rubber bearing consists of a top and a bottom connecting steel plates, one or more lead cores, internal natural rubber layers, internal steel plates, a rubber cover and a top and a bottom sealing plates.

INTERNAL NATURAL RUBBER LAYER: Guarantee the horizontal displacement function of the LRB.

INTERNAL STEEL PLATE LAYER: Provide a higher load bearing capacity that allows the LRB to support buildings stably.

LEAD CORE: The purity of the lead core shall be at least 99.9%. When the LNB is subiect to a shear deformation, it absorbs seismic energy through the plastic deformation. When the earthquake is over, lead core will restore the building to its original position automatically through the action of rubber shear force in the process of dynamic recovery and recrystallization.

WORKING PRINCIPLE

Install a lead rubber bearing at the bottom or in the middle of the building to form a seismic layer and separate the upper structure from the lower foundation. When the earthquake occurs, the vibration energy of the lower foundation will be transferred to the lead rubber bearing first. When the LRB displaces horizontally, metal lead cores inside can not only provide a lateral resistance but also dispatch seismic energy through its deformation when large deformation occurs, In this way, the transmission of seismic energy to the superstructure can be effectively avoided or reduced, thereby ensuring the safety of the superstructure and personnel & devices inside and the normal operation of indoor equipment.

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