Earthquake Resistant Designs

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Earthquake Resistant Designs

  1. 1. By M. MayurIVth CIVIL - SIETK, PUTTUR. 1
  2. 2. 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. 2
  3. 3. What are Earthquakes?• sudden movement - surface of the earth - may be tiny or several feet.• enormous amounts - of energy released – greater - Nuclear Bomb.• sudden shift of rock - fracture of Earth. 3
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  5. 5. Origin of Earthquakes Earthquakes - Plate Tectonic Forces. Theory of Plate tectonic forces - He stated that continents moved from their original position - Continental Drift. 5
  6. 6.  Different boundaries - tectonic forces induces Earth: Divergent boundary, Convergent, Transform boundaries. 6
  7. 7. Seismology When earthquakes occur, waves travel in Earth in form of vibrations, such waves are called Seismic Waves. Study of such waves - Seismology. Instrument measuring seismic waves - Seismometer. Graphs given by that seismometer - Seismic Graph. 7
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  9. 9. Terms of EQ’s: Seismic Loading : Main cause of Earthquakes Seismic Performance : Structure’s ability - functions - safety and serviceability - exposure - earthquake. Seismic Analysis : Major intellectual tool – understand seismic performance of structures. 9
  10. 10.  Earthquakes affect RCC structures too… Slabs forces the beam to bend with it when horizontal forces act. 10
  11. 11. 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 11
  12. 12. Popular Earthquake resistantTechniques 12
  13. 13. Introduction of Resistanttechniques 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. 13
  14. 14. Base Isolation Devices 14
  15. 15. Base Isolation DevicesBase 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. 15
  16. 16.  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. 16
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  21. 21. Seismic Dampers 22
  22. 22. SD’s in structures: 23
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  24. 24.  Dampers are of:  Viscous Damper  Friction Damper  Yielding Damper
  25. 25. Note points: BID SD’S separating structures from  additional systems ground by means of devices. introduced in structures. Can be done when structure  even when structure is is already constructed, but it completed, systems can be is costly. introduced. Cheaper compared to  Very costly, since linked with Seismic Dampers. hardware programmes. 28
  26. 26. Frames Resisting EQ’ 29
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  29. 29. Increase in SeismicPerformance Quality Control in Construction. 32
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  32. 32. CONCLUSION We are only hope of tomorrow’s constructions. WE ARE HERE ONLY TO PROVIDE SAFETY TO PUBLIC TO LEAD THEIR LIFE HAPPILY. 35
  33. 33. THANK YOU… 36
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