![]() ![]() Because the bearings are very stiff in the vertical direction and very flexible in the horizontal direction, under seismic loading the bearing layer isolates the building from the horizontal components of the ground movement while the vertical components are transmitted to the structure relatively unchanged. The bearings are made by vulcanization bonding of sheets of rubber to thin steel reinforcing plates. In this approach, the building or structure is decoupled from the horizontal components of the earthquake ground motion by interposing a layer with low horizontal stiffness between the structure and the foundation. The system that has been adopted most widely in recent years is typified by the use of elastomeric bearings, the elastomer made of either natural rubber or neoprene. There are two basic types of isolation systems. A variety of different types of base isolation bearing pads have now been developed, and a base isolated structure is supported by a series of bearing pads which are placed between the building and the building’s foundation, where as fixed base buildings are everyday conventional foundations. We notice that large rubber bearings are used to connect the structure and base of the building isolating the structure and its movemetns from foundation. Here we notice that the building with base isolation is safer than the conventional base structure. The concept of base isolation are quite simple.įirst let us explain a fixed base building and base isolated building which is clear from the following figures. There has been many experiments and designs been followed with the concept of base isolation for the past 30 odd years and at many places they seem to be out performing the conventional fixed base isolation with conventional structure strengthens approaches. ![]() They are all proved to be failing and seismic activities have been damaging human lives and properties all over the world. This is generally accomplished through the selection of an appropriate structural configuration and the careful detailing of structural members, such as beams and columns, and the connections between them. The conventional approach to earthquake resistant design of buildings have seen to be followed all over the world, mostly depends upon providing building with strength, stiffness and inelastic deformation capacity which are great enough to withstand a given level of earthquake-generated force. ![]() Recently we have seen that conventionally constructed buildings have been seen to be crumbled under tremedus destructive strength of earthquake which runs as high as 7.0 on Richter scale in many parts of the world. have been involved in many of these projects and our home page and connected links provide information on a wide range of rubber products on base isolation too. Neoprene bridge bearing, bearing pads, laminated elastomeric bearing, elastomeric bearing. Most of the completed buildings and those under construction use rubber base isolation bearings in some way in the isolation system. Many types of structures have been built using this approach, incorporating base isolation and many others are in design phase or under construction. In recent years base isolation has become an increasingly applied structural design technique for buildings and bridges in highly seismic prone areas. Base Isolation (Seismic Rubber Bearing Pads) ![]()
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