Base Isolation

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.

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


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


Foundation constructed on layers of timber in traditional buildings


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


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.

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Base Isolation

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