asfas

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. 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.  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. Seismic Isolator
Cover Rubber
Energy Dissipation Core
Steel Reinforcing Plates
Internal Rubber Layers
Bottom Mounting
Plate

5. Base Isolation System using Elastomeric Bearings Base Isolation System using Elastomeric Bearings

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. Typical Base Isolation in Modern Buildings

9. San Francisco Airport International Terminal
World’s Largest Isolated Building

10. 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

11. Movement of Building with Base
Isolation vs. No Base Isolation
isolated
not isolated

12. Response of base isolation system

13. 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.

14. 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

15. Limitations
 Costly, at the initial phase of construction.
 New in terms of use, thus facing the resistance to change.
 Requires higher technology and design

16. Building Details
 Reinforced concrete frame structure
 At least 4 bedroom, living room, utility rooms, staircase and lift
 Parking lot , yard and garden

17. Thank you!!
Any questions ??