Lead Rubber Bearing (LRB)

Lead rubber bearing as one of the well-known structural seismic protection devices works on the principles of base isolation and reduces the earthquake-induced forces transferred to the structure. Similar to regular natural rubber bearing, LRB consists of a laminated rubber and steel bearing with steel connection plates, but equipped by one or several energy dissipating lead cores. The weight of the structure would be supported by its high vertical stiffness characteristic provided by the thin layers of rubber reinforced by steel shims. The rubber layers act as spring and provide the isolation and re-centering the bearing after an earthquake event. The lead core(s) will undergo plastic deformation, generate heat, and dissipate the seismic energy during an earthquake. Due to the high absorption capacity of the lead cores with a minimum purity of 99.9%, they provide a high level of damping of up to 30%. Lead rubber bearings have found wide range of applications in structures. KOHRANG lead rubber bearings are manufactured using high quality elastomeric material, vulcanized reinforcement steel plates, and lead core(s). The bearings act as regular elastomeric bearings under normal conditions.

KOHRANG Lastic Company designs, manufactures, tests, and supplies Lead rubber bearings to meet all international standards specifications such as; BS, EN, AASHTO, DIN, and ISO. The KOHRANG lead rubber bearings are proven, safe, and versatile.