Base Isolation System Using Multilayer Natural Rubber Provides high performance seismic isolation combined with various dampers. Advantages Wide range of bearing capacity (about 100 - 2000 tons/unit) Natural rubber provides high durability and reliability with stable performance and little variation in the mechanical characteristics. RB and RB-S can be combined with a variety of isolation systems or dampers such as LRB or BMD. Stability is provided in all horizontal directions and capacity for large deformations is also provided. A smaller bearing can be made with the same characteristics as a round RB, saving space and reducing cost. Structure RB/RB-S is an isolation system with multilayer natural rubber construction which provides load support and vibration isolation. Compact design saves installation space. Basic Features This chart shows the relationship between force and displacement when RB/RB-S is subjected to major deformation as would be expected during a major earthquake. Restoring force of RB/RB-S is shown as a straight line. This characteristic makes structural analysis relatively simple. Function Function of multilayer rubber isolator 1) Load supporting function Rubber reinforced with steel plates provides stable support for structures. Multilayer construction provides better vertical rigidity than single layer rubber pads for supporting a building. 2) Horizontal elasticity function (prolonged oscillation period ) Earthquake vibration is converted to low speed motion. As horizontal stiffness of the multi-layer rubber bearing is low, strong earthquake vibration is alleviated and the oscillation period of the building is increased. 3) Restoration function Horizontal elasticity returns the building to its original position. After an earthquake the restoring force of the rubber layers returns the building to the original position.