This document discusses base isolation as a means of protecting structures from earthquake forces. It describes different types of base isolators like elastomeric rubber bearings and friction pendulum systems. The most common configuration is to install isolators immediately above a diaphragm. While base isolation provides advantages like protecting structures and concentrating damage, it also has disadvantages such as being inefficient for tall buildings and requiring skilled labor.

1. BASE
ISOLATIO
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2. EARTHQUAKE
 is the shaking of the surface of the Earth

3. BASE ISOLATION
 is one of the most popular means of protecting a
structure against earthquake forces

4. TYPES OF BASE ISOLATORS
 Elastomeric Rubber Bearing :Bearing formed by
horizontal layers of synthetic/natural rubber in thin
layers bound between steel plates.

5. TYPES OF BASE ISOLATORS
 High Density Rubber Bearing: This is another
type of elastomeric bearings

6. TYPES OF BASE ISOLATORS
 Friction Pendulum System: It is sliding type
system of isolation

7. LOCATION OF BASE
ISOLATORS
 The most common configuration is to install a diaphragm
immediately above the isolators.
 If the structure has basement is structure then the options are to
install the isolators at top, bottom & mid-hit of the basement
columns & walls.

8. ADVANTAGES OF BASE
ISOLATED
 The most important advantages lie in the fact that
it protects the structure from seismic activities
 The structures with base isolators are more
predictable & hence they have high reliability as
compared to conventional structures.
 In large seismic forces, the damage is
concentrated in isolation systems where the
elements can be substituted easily.

9. DISADVANTAGESOF BASE
ISOLATED
 It is less efficient for high rise buildings.
 It requires highly skilled labors & engineer for its
implementation.
 It can be applied partially to structures
 It can be done on the structures resting on soft
soils.

10. APPLICATIONS
 LA city hall in the tallest base isolated building in
the world

11. THANK YOU