1. “Base isolation and Seismic Consideration in Civil Engineering”..
Dr M.K.RATH, Professor Structural Engineering Department of civil engineering Centurion university of technology and management

2. CONTENT.. INTRODUCTION SEISMIC FORCE Different Seismic Zones In India
MAGNITUDE AND INTENSITY OF EARTHQUAKE
HAZARDS DUE TO EARTHQUAKE
LIQUEFACTION OF SOIL
PREVENTION OF LIQUEFACTION
EARTHQUAKE-RESISTANT DESIGN
EFFECT OF BASE ISOLATION METHODS
SEISMIC DAMPERS

3. INTRODUCTION
An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's crust that creates seismic waves.
These produce surface waves, which cause vibration of the ground and as a result the super structure is collapsed.

4. SEISMIC FORCE Seismic Forces is generated due to Earthquake.
Earthquake causes
shaking of the ground.
So a building resting on
it will experience motion
at its base.

5. DIFFERENT SEISMIC ZONE IN INDIA

6. MAGNITUDE AND INTENSITY OF EARTHQUAKE
The Magnitude (M) is a quantitative measure of its strength in terms of energy released .
INTENSITY
The intensity of an earthquake is measured qualitatively in terms of damages caused by it at a particular location.
In general, larger the earthquake, greater is the intensity.
Magnitude of an earthquake is a measure of its size. While intensity is an indicator of the severity of shaking generated at a given location.

7. HAZARDS DUE TO EARTHQUAKE
Liquefaction of Soils
Ground Shaking
Surface Rupture
Landslides
Lateral Spreading
Shear Failure of Foundation
Settlements of Structures
Failure of Retaining Wall
Tsunamis

8. LIQUEFACTION OF SOIL Soil liquefaction describes a
phenomenon whereby a
saturated or partially
saturated soil
substantially
loses  strength  and 
stiffness
in response to
an applied stress, usually
  earthquake shaking or
other sudden change in
stress condition, causing
it to behave like a liquid.

9. PREVENTION OF LIQUEFACTION
Providing Deep Foundation
Compaction of Soil
Replacing the Liquefaction Soil
Grouting The Soil
Ground Water Pumping
Drainage of Soil
Providing Stone Columns

10. EARTHQUAKE-RESISTANT DESIGN
Objective of Earthquake-Resistant Design is to make such buildings that can resist effect of ground motion and would not collapse during the strong Earthquake.
All the components of the structure and foundations are designed to resist inertia forces in addition to the normal forces.
All the walls must be jointed properly, so that they can act together against the earthquake shaking at the time of seismic force transferring to the ground.

11. BASE ISOLATION METHOD
The idea behind the Base Isolation is to detach (isolate) the building from the ground in such a way that earthquake motions are not transmitted up through the building, or at least greatly reduced.
If a building is rested on flexible pads that offer resistance against lateral movements, then some effect of the ground shaking will be transferred to the building above. If the flexible pads are properly chosen, the forces induced by ground shaking can be a few times smaller than that experienced by the building built directly on ground.

12. EFFECT OF BASE ISOLATION METHOD

13. SWING BEAM

14. BASE ISOLATION METHOD

15. SEISMIC DAMPERS
Seismic Dampers are fixed in place of structural elements as diagonal braces.
They absorb a part of seismic energy when it is transmitted through them.
TYPES OF SEISMIC DAMPERS:
a. Viscous Dampers
Energy is absorbed by silicone-based
fluid passing between piston-cylinder
arrangement.

16. VISCOUS DAMPER
Below the Bridge from the foundation level of the super structure

17. SEISMIC DAMPERS . Friction Dampers Energy is absorbed by surfaces with
friction between
them rubbing
against
each other .

18. Friction Dampers

19. SEISMIC DAMPERS . Yielding Dampers Energy is absorbed by metallic
components.

20. Yielding Dampers

22. CONCLUSION
Seismic base isolation method has proved to be a reliable method of earthquake resistant building.
The success of this method is largely attributed to the development of isolation devices and proper planning.
Adoptable isolation systems are required to be effective during a wide range of seismic events.

23. REFFERENCE.. Wikipedia WWW.youtube.com
From Google about base isolation..