EARTH QUAKE RESISTANT STRUCTURE

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Earthquake Resistant STRUCUTE

• By
• S. Mohamed Hithayathulla,
• S. Michael Roghen Raj,
• IInd CIVIL ,
• M.I.E.T ENGINEERING COLLEGE,
• TRICHY.

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Structure of Earth

• Earth - three layers - Crust, Mantle, Core.
• Crust - surface of Earth, Mantle second inner
  part of the Earth, Core - most inner part of the
  Earth.

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Earth Divergent bounDifferent
boundaries - tectonic forces induces dary,
Convergent, Transform boundaries.
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Terms of EQs

• Seismic Loading Main cause of Earthquakes
• Seismic Performance Structures ability -
  functions - safety and serviceability - exposure
  - earthquake.
• Seismic Analysis Major intellectual tool
  understand seismic performance of structures.

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Earthquakes affect RCC structures
too Slabs forces the beam to bend with
it when horizontal forces act.
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Earthquake resistant designs

• Design - but it is analysis of forces - buildings
  due to loads acting on it.
• If a building is enough to resist the earthquake,
  then such building is called Earthquake
  resistant structure.
• Such design is called Earthquake resistant designs

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Popular Earthquake resistant Techniques

• Earthquake may not be able to damage entire
  building but it damages members of it.
• So special techniques are adopted
• Base Isolation Devices and
• Seismic Dampers.

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Introduction of Resistant techniques

• Thought - Base Isolation Devices - separate
  building from ground by some rubber devices.
• Seismic dampers - special devices - introduced in
  building - absorb the energy - produced by
  seismic waves.

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Base Isolation Devices

• Base isolation Devices - Active Control System
  which contains
• Sensors - measure external
• excitation - structural response.
• Computer hardware and
• software - compute control forces
• observed excitation.
• Actuators provide
• necessary control forces.

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• Control Force Devices
• Active Tuned Mass Dampers - natural extension
  experiments indicate 25 less damage.
• Tendon Control used even for active devices
  works when active devices are off act by
  resisting tension in structure.

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Seismic Dampers
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SDs in structures
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• Dampers are of
• Viscous Damper
• Friction Damper
• Yielding Damper

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Note points

• separating structures from ground by means of
  devices.
• Can be done when structure is already
  constructed, but it is costly.
• Cheaper compared to Seismic Dampers.

• additional systems introduced in structures.
• even when structure is completed, systems can be
  introduced.
• Very costly, since linked with hardware
  programmes.

• BID

• SDS

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Frames Resisting EQ
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Increase in Seismic Performance

• Quality Control in Construction.

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CONCLUSION

• We are only hope of tomorrows constructions.
• WE ARE HERE ONLY TO PROVIDE SAFETY TO
  PUBLIC TO LEAD THEIR LIFE
• HAPPILY.