Base Isolation for Earthquake Resistance
Base Isolation for Earthquake Intransigence
It is easiest to see the principle at work by referring directly to the most widely used of these advanced techniques, known as base isolation. A base lone structure is supported by a series of bearing pads, which are placed between the buildings and building foundation.
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The concept of base isolation is explained through an example building resting on frictionless rollers. When the ground shakes, the rollers unrestrainedly roll, but the building above does not move. Thus, no force is transferred to the building due to the shaking of the ground; simply, the building does not go through the earthquake. Now, if the same building is rested on the flexible pads that offer resistance against lateral movements, then some effect of the ground shaking will be transferred to the construction above. If the flexible pads are properly chosen, the forces induced by ground shaking can be a few times smaller than that mature by the building built directly on ground, namely a fixed base building. The flexible pads are called base-isolators, whereas the structures protected by means of these devices are called base-separate buildings. The main feature of the base isolation technology is that it introduces flexibility in the structure.
Traditional Earthquake Mitigation Techniques
Base Isolation Knowledge
Due to the flexibility in the structure, a robust medium-rise masonry or reinforced concrete building becomes extremely pliable. The isolators are often designed, to absorb energy and thus add damping to the system. This helps in further reducing the seismic response of the building. Many of the base isolators look like chunky rubber pads, although there are other types that are based on sliding of one part of the building............... building
Source: مهندسی عمران در EAST STRUCTURE
