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Base_isolation_presentation.pptx

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Base_isolation_presentation.pptx

  1. 1. G+3 RESIDENTAL BUILDING WITH BASE ISOLATION An innovative approach for earthquake safe structures Presented by group -O Shubash Sah Godh Sunil Kumar Das Binod Kumar Tharu Prakash Diwakar Karna Nabin Kumar Gupta
  2. 2. What is base isolation ?  Base isolation is a state-of-the-art method in which the structure (superstructure) the structure is separated from the base (foundation or substructure) by introducing a suspension system between the base and the main structure.  Base isolation, also known as seismic isolation system, is a collection of structural elements which should substantially decouple a superstructure from its substructure resting on a shaking ground thus protecting the building’s structural integrity.  It is the most powerful tool of the earthquake engineering pertaining to the passive structural vibration control technologies.
  3. 3.  An base isolation system must satisfy four basic criteria of effectiveness, in particular, acceleration response, shear and overturning moments are reduced by a factor of four to eight for buildings mounted on isolators. (IJISET - International Journal of Innovative Science, Engineering & Technology, Vol. 1 Issue 8, October 2014.)
  4. 4. Seismic Isolator Cover Rubber Energy Dissipation Core Steel Reinforcing Plates Internal Rubber Layers Bottom Mounting Plate
  5. 5. Base Isolation System using Elastomeric Bearings Base Isolation System using Elastomeric Bearings
  6. 6. Goals of base isolation  Protection of Life – Current Code  Additional Benefits of Isolation Protection of Building Frame Protection of Non-Structural Components and Contents Provide for an operational facility after the earthquake Protection of Processes and Function
  7. 7. Typical Base Isolation in Modern Buildings
  8. 8. San Francisco Airport International Terminal World’s Largest Isolated Building
  9. 9. Applications of Base Isolation  1st application in New Zealand in 1974  1st US application in 1984  1st Japanese application in 1985  US - 80 buildings and 150 bridges  Japan - 1000 buildings and 500 bridges  India – Bujhi hospital Gujrat 2001, Few Buildings  Nepal – Not recorded yet
  10. 10. Movement of Building with Base Isolation vs. No Base Isolation isolated not isolated
  11. 11. Response of base isolation system
  12. 12. advantages of base Isolation # Base Isolation is meant to enable a building or non-building structure to survive a potentially devastating seismic impact through a proper initial design or subsequent modifications(retrofit). # The application of this technique can raise a structure's seismic performance and its seismic sustainability considerably. # It provides the design profession the ability to design a building that is “operational” after a major earthquake.
  13. 13. In nepal…  Can be easily applied in increasing skyscrapers with a little development in technical skills.  Economically feasible if the cost after earthquake is accounted.  Nepal, being in highly earthquake susceptible region, may serve a good option
  14. 14. Limitations  Costly, at the initial phase of construction.  New in terms of use, thus facing the resistance to change.  Requires higher technology and design
  15. 15. Building Details  Reinforced concrete frame structure  At least 4 bedroom, living room, utility rooms, staircase and lift  Parking lot , yard and garden
  16. 16. Thank you!! Any questions ??

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