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BY:SYED JABER
Effects of Earthquake
Seismic 
Intuition
Definition: 
•Seismic retrofitting is the modification of 
existing structures to make them more resistant to seismic 
activity, ground motion, or soil failure due to earthquakes. 
The retrofit techniques are also applicable for 
other natural hazards such as tropical cyclones, 
tornadoes, and severe winds from thunderstorms.
Column jacketing 
Shear wall 
Beam-columns joint 
jacketing 
Strengthening of individual footings
Most widely used method of seismic 
retrofitting is the technique of Base isolation. 
Buildings with foundation base fixed to 
the super structure are known as Fixed 
base. 
Buildings with rubber or similar 
isolation between to base foundation and 
structure are known as Base isolated 
buildings.
BASE ISOLATION SYSTEM 
The main concept behind base isolation is allowing 
slight lateral movement of the base in order to 
increase the fundamental time period of the 
structure. This increase in the period will cause the 
structure to be less attractive to seismic forces and 
will result in less structural deformations.
Base isolation is categorized into two very different yet 
broad methods. 
Flat Sliding Bearing 
1.Sliding system. 
Flat sliding system 
Spherical sliding isolator 
2.Elastometric isolators 
Lead Rubber Bearing 
Natural rubber bearings 
Low damping rubber bearings 
Lead plug bearings 
High damping rubber bearings
Flat Sliding Bearing
•The role of the lead plug is to regulate the lateral displacement of the 
infrastructure and dissipate the kinetic energy of the seismic motion. It 
converts the energy of motion from the system into heat. By doing so, it does 
not allow as much kinetic energy to flow to the infrastructure. 
•Internal rubber layers provide lateral flexibility. 
•Bottom mounting plate connects to structure above and below isolator. and 
•Steel reinforcing plates which provide vertical load capacity and confines lead 
core. 
•Rubbers cover for protecting steel plates.
Traditionally, the application of the system is seen in 
larger buildings and bridges. Additionally, engineers have 
made an effort to apply the system at a lower cost in 
residential areas. 
Base isolation techniques have been utilized worldwide in 
historical structures and monuments to reduce any possible 
destruction. Also on a smaller scale, museums have started 
to use the system to ensure the security of artifacts
Base Isolation as a Whole
Thank U 
ANY QUERIES???

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BASE ISOLATION SYSTEM

  • 2.
  • 5. Definition: •Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. The retrofit techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes, and severe winds from thunderstorms.
  • 6.
  • 7. Column jacketing Shear wall Beam-columns joint jacketing Strengthening of individual footings
  • 8. Most widely used method of seismic retrofitting is the technique of Base isolation. Buildings with foundation base fixed to the super structure are known as Fixed base. Buildings with rubber or similar isolation between to base foundation and structure are known as Base isolated buildings.
  • 9. BASE ISOLATION SYSTEM The main concept behind base isolation is allowing slight lateral movement of the base in order to increase the fundamental time period of the structure. This increase in the period will cause the structure to be less attractive to seismic forces and will result in less structural deformations.
  • 10. Base isolation is categorized into two very different yet broad methods. Flat Sliding Bearing 1.Sliding system. Flat sliding system Spherical sliding isolator 2.Elastometric isolators Lead Rubber Bearing Natural rubber bearings Low damping rubber bearings Lead plug bearings High damping rubber bearings
  • 12. •The role of the lead plug is to regulate the lateral displacement of the infrastructure and dissipate the kinetic energy of the seismic motion. It converts the energy of motion from the system into heat. By doing so, it does not allow as much kinetic energy to flow to the infrastructure. •Internal rubber layers provide lateral flexibility. •Bottom mounting plate connects to structure above and below isolator. and •Steel reinforcing plates which provide vertical load capacity and confines lead core. •Rubbers cover for protecting steel plates.
  • 13. Traditionally, the application of the system is seen in larger buildings and bridges. Additionally, engineers have made an effort to apply the system at a lower cost in residential areas. Base isolation techniques have been utilized worldwide in historical structures and monuments to reduce any possible destruction. Also on a smaller scale, museums have started to use the system to ensure the security of artifacts
  • 14. Base Isolation as a Whole
  • 15. Thank U ANY QUERIES???