BASE ISOLATION

BASE ISOLATIONAn innovative approach for earthquake safe structures

Free Powerpoint TemplatesPage #What is base isolation ?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 buildings structural integrity.It is the most powerful tool of the earthquake engineering pertaining to the passive structural vibration control technologies.

Free Powerpoint TemplatesPage #

Cover RubberEnergy Dissipation CoreSteel Reinforcing PlatesInternal Rubber LayersBottom Mounting Plate(Top Mounting Plate Not Shown)Seismic IsolatorFree Powerpoint TemplatesPage #Friction Pendulum Bearing

Free Powerpoint TemplatesPage #

Base Isolation System using Spherical Sliding Isolation SystemFree Powerpoint TemplatesPage #

Base Isolation System using Elastomeric Bearings

Free Powerpoint TemplatesPage #Goals of base isolationProtection of Life Current CodeAdditional Benefits of IsolationProtection of Building FrameProtection of Non-Structural Components and ContentsProvide for an operational facility after the earthquakeProtection of Processes and Function

Free Powerpoint TemplatesPage #

Foundation constructed on layers of timber in traditional buildings

Free Powerpoint TemplatesPage #

Typical Base Isolation in Modern BuildingsFree Powerpoint TemplatesPage #

San Francisco Airport International TerminalWorlds Largest Isolated Building

Free Powerpoint TemplatesPage #Applications of Base Isolation1st application in New Zealand in 19741st US application in 19841st Japanese application in 1985US - 80 buildings and 150 bridgesJapan - 1000 buildings and 500 bridgesNepal Not recorded yet

Free Powerpoint TemplatesPage #

Movement of Building with Base Isolation vs. No Base Isolation

isolated

not isolatedFree Powerpoint TemplatesPage #Ground Forces are amplified by a factor of 3 to 4 at the roof.

Forces reduced by 3 to 6 across the isolatorsForces reduced by 8 to 12 at the roof

Isolated StructureConventional Structure Free Powerpoint TemplatesPage #Ground Forces are amplified by a factor of 3 to 4 at the roof.Forces reduced by 3 to 6 across the isolatorsForces reduced by 8 to 12 at the roof Isolated StructureConventional Structure

Free Powerpoint TemplatesPage #Ground Forces are amplified by a factor of 3 to 4 at the roof.Forces reduced by 3 to 6 across the isolatorsForces reduced by 8 to 12 at the roof Isolated StructureConventional Structure

Free Powerpoint TemplatesPage #advantages of base IsolationBase 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.

Free Powerpoint TemplatesPage #Benefits of Seismic Isolation RetrofitWork maybe Confined to BasementBuilding Can Continue to be OccupiedOften the Most Economic Solution

Free Powerpoint TemplatesPage #In nepalCan 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.Free Powerpoint TemplatesPage #DEMONSTRATIONS

Yes, It Works!!!Free Powerpoint TemplatesPage #LimitationsCostly, at the initial phase of construction.New in terms of use, thus facing the resistance to change.Requires higher technology and design.Free Powerpoint TemplatesPage #ConclusionsBase isolation provides the highest level of protection operational - after a major earthquake.

Base isolation has significant benefits for the earthquake protection of historic structures.

Free Powerpoint TemplatesPage #THANK YOU!Free Powerpoint TemplatesPage #