This document introduces base isolation as a seismic retrofitting technique. It defines base isolation as decoupling a structure's superstructure from its substructure using structural elements. The document discusses the principle of base isolation, which is to isolate the structure from ground movement. It compares base isolation to other retrofitting techniques, noting advantages such as reduced structural damage and maintenance costs. The document also outlines different base isolation systems using elastomeric bearings and sliding systems. Examples of base isolation projects and companies utilizing the technique are provided. The document suggests government initiatives and training to develop base isolation in India.
Base isolation is one of the most widely accepted seismic protection systems in earthquake prone areas. It mitigates the effect of an earthquake by essentially isolating the structure from potentially dangerous ground motions, especially in frequency range where building is mostly affected. This includes
Concept of Base Isolation
Principle of Base Isolation
Comparison of Fixed Base Structure and Isolated Base Structure
Types of Isolation Components
Base Isolation in Real Buildings
Applications of Base Isolation
Base isolation is one of the most widely accepted seismic protection systems in earthquake prone areas. It mitigates the effect of an earthquake by essentially isolating the structure from potentially dangerous ground motions, especially in frequency range where building is mostly affected. This includes
Concept of Base Isolation
Principle of Base Isolation
Comparison of Fixed Base Structure and Isolated Base Structure
Types of Isolation Components
Base Isolation in Real Buildings
Applications of Base Isolation
Base isolation system consists of isolation units with or without isolation components, where: Isolation units are the basic elements of a base isolation system which are intended to provide the aforementioned decoupling effect to a building or non-building structure. Isolation components are the ...
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Report on Study on Base Isolation Techniques.Gaurav Mewara
Base Isolation technique is on of the advance technique used for construction of earthquake resisting sturcture.
All earthquake resisting structure are based on this technique.
This consit report on study of base isolation with its advantages disadvanges.
Earthquake resistant building constructiondaspriyabrata3
1 INTRODUCTION
2 EARTHQUAKE THEORY
3 EARTHQUAKE MAGNITUDE AND ENERGY
4 EFFECTS OF EARTHQUAKES
5 MAJOR EARTHQUAKES
6 NOTABLE EARTHQUAKES AND THEIR ESTIMATED
MAGNITUDE
7 HOW EARTHQUAKE RESISTANT CONSTRUCTION IS
DIFFERENT
8 SEISMIC DESIGN PHILOSOPHY
9 EFFECT OF EARTHQUAKE ON REINFORCED CONCRETE BUILDINGS
10 ROLES OF FLOOR AND MASONRY WALLS SLABS
11 STRENGTH HIERARCHY
12 EARTHQUAKE RESISTANT BUILDING
13 EARTHQUAKE DESIGN PHILOSOPHY
14 REMEDIAL MEASURES TO MINIMISE THE LOSSES DUE TO EARTHQUAKES
15 EARTHQUAKE RESISTANT BUILDING CONSTRUCTION WITH REINFORCED HOLLOW CONCRETE BLOCK(RHCBM)
16 STRUCTURAL FEATURES
17 STRUCTURAL ADVANTAGES
18 CONSTRUCTIONAL ADVANTAGES
19 ARCHITECTURAL AND OTHER ADVANTAGES
20 STUDIES ON THE COMPARATIVE COST ECONOMICS OF RHCBM
21 MID-LEVEL ISOLATION 32-34
22 EARTHQUAKE RESISTANCE BUILDING USING SEISMIC ISOLATION SYSTEMS WITH SLIDING ON CONCAVE SURFACE
23 DESCRIPTION
24 CONCEPT OF FRICTION PENDULUM BEARING
25 SLIDING PENDULUM SEISMIC ISOLATION SYSTEM
26 BACKGROUND OF THE INVENTION
27 BRIEF SUMMARY OF THE INVENTION
28 DETAILED DESCRIPTION OF THE INVENTION
29 ESTIMATION
30 CONCLUSION
31 BIBLIOGRAPHY
Dhruvin Goyani
M.Tech Structural
This PPT is For All the Civil Engineering Students and Specially for M.tech Students Who Trying To Learn Something New on Earthquake and its Resisting Methods and also For Seismic Analysis
Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
Base isolation system consists of isolation units with or without isolation components, where: Isolation units are the basic elements of a base isolation system which are intended to provide the aforementioned decoupling effect to a building or non-building structure. Isolation components are the ...
base isolation systems
base isolation system in building
base isolation pdf
base isolation definition
base isolation foundation
base isolation cost
base isolation techniques
base isolation pads
interesting civil engineering topics
civil engineering topics for presentation
civil seminar topics ppt
civil engineering seminar topics 2018
seminar topics pdf
best seminar topics for civil engineering
seminar topics for mechanical engineers
latest civil engineering seminar topics
Report on Study on Base Isolation Techniques.Gaurav Mewara
Base Isolation technique is on of the advance technique used for construction of earthquake resisting sturcture.
All earthquake resisting structure are based on this technique.
This consit report on study of base isolation with its advantages disadvanges.
Earthquake resistant building constructiondaspriyabrata3
1 INTRODUCTION
2 EARTHQUAKE THEORY
3 EARTHQUAKE MAGNITUDE AND ENERGY
4 EFFECTS OF EARTHQUAKES
5 MAJOR EARTHQUAKES
6 NOTABLE EARTHQUAKES AND THEIR ESTIMATED
MAGNITUDE
7 HOW EARTHQUAKE RESISTANT CONSTRUCTION IS
DIFFERENT
8 SEISMIC DESIGN PHILOSOPHY
9 EFFECT OF EARTHQUAKE ON REINFORCED CONCRETE BUILDINGS
10 ROLES OF FLOOR AND MASONRY WALLS SLABS
11 STRENGTH HIERARCHY
12 EARTHQUAKE RESISTANT BUILDING
13 EARTHQUAKE DESIGN PHILOSOPHY
14 REMEDIAL MEASURES TO MINIMISE THE LOSSES DUE TO EARTHQUAKES
15 EARTHQUAKE RESISTANT BUILDING CONSTRUCTION WITH REINFORCED HOLLOW CONCRETE BLOCK(RHCBM)
16 STRUCTURAL FEATURES
17 STRUCTURAL ADVANTAGES
18 CONSTRUCTIONAL ADVANTAGES
19 ARCHITECTURAL AND OTHER ADVANTAGES
20 STUDIES ON THE COMPARATIVE COST ECONOMICS OF RHCBM
21 MID-LEVEL ISOLATION 32-34
22 EARTHQUAKE RESISTANCE BUILDING USING SEISMIC ISOLATION SYSTEMS WITH SLIDING ON CONCAVE SURFACE
23 DESCRIPTION
24 CONCEPT OF FRICTION PENDULUM BEARING
25 SLIDING PENDULUM SEISMIC ISOLATION SYSTEM
26 BACKGROUND OF THE INVENTION
27 BRIEF SUMMARY OF THE INVENTION
28 DETAILED DESCRIPTION OF THE INVENTION
29 ESTIMATION
30 CONCLUSION
31 BIBLIOGRAPHY
Dhruvin Goyani
M.Tech Structural
This PPT is For All the Civil Engineering Students and Specially for M.tech Students Who Trying To Learn Something New on Earthquake and its Resisting Methods and also For Seismic Analysis
Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
Earthquake protection of buildings by seismic isolationgayathrysatheesan1
During the devastating February 2011 Christchurch earthquake, the iconic art gallery suffered damage and ground settlement. Triple Pendulum isolators were added at the basement level as part of the building’s repair and strengthening plan. The isolators increase the building’s seismic resilience and protect the precious art collections.
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Eatrhquake response of reinforced cocrete multi storey building with base iso...eSAT Journals
Abstract A seismic base isolation is an earthquake resistant design method that is based on reducing the seismic demand and also the ductility demand. The basic concept of base isolation system is to increase the natural time period of the fixed base building and to protect the structure from the seismic effect. The main purpose of this work is to study the dynamic response of structure when subjected to different isolators. For this purpose, a three dimensional response spectrum analysis and time history analysis is performed using a commercial structural analysis software package called as SAP 2000 to study the influence of isolation damping on building. The main objective is to make a comparison between the fixed base building and various isolation systems such as friction pendulum isolator, lead rubber bearing (LRB) isolator and high damping rubber isolator, subjected to strong earthquakes to achieve an optimal design of the base isolation system. SAP 2000, a popular large scale explicit finite element analysis software used to stimulate the behavior of base isolated structure. In the present work, it was found that base isolation substantially increases the time period of structure and hence correspondingly reduces the base shear. The top displacement for fixed and isolated cases conspicuously shows the reduction in the case of isolated frame. The study shows that the bending moment and shear force values are reduced for base isolated frame when compared to fixed base building. From design consideration the steel requirement is reduced in base isolated structures when compared to fixed base building. Key Words: Isolators, SAP2000
2. Acknowledgement
Before going into this presentation , I would like to
thank my respected faculties here for their help , their
support and their guidance throughout the duration
and completion of this project.
3. Introduction
In this presentation, we are going to
Introduce Retrofitting
Describe its techniques with Base Isolation as an
example
Compare Base Isolation With other Retrofitting
techniques
Discuss about the government initiatives.
Discussion on how to make this technology
developed for future purposes.
4. Retrofitting
Seismic Retrofitting is the modification of
existing structures to make them more resistant
to seismic activity , ground motion, or soil failure
due to earthquakes.
6. Base Isolation
Base isolation, also known as seismic base isolation or base isolation system, is
one of the most popular means of protecting a structure
against earthquake forces.It is a collection of structural elements which should
substantially decouple a superstructure from its substructure resting on a
shaking ground thus protecting a building or non-building structure's integrity.
Base isolation is one of the most powerful tools of earthquake
engineering pertaining to the passive structural vibration control technologies. It
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. In some cases, application of base isolation can raise both a
structure's seismic performance and its seismic sustainability considerably.
Base isolation system consists of isolation units with or without isolation
components, where
• Isolation units are the basic elements of a base isolation system which are
intended to provide the aforementioned decoupling effect to a building or
non-building structure.
• Isolation components are the connections between isolation units and their
parts having no decoupling effect of their own.
7. Principle Of Base Isolation
The main principal of base isolation is to try and
isolate the structure from the ground movement
so you could just about put it on ball bearings if
you like and the ground could move underneath
it and the building stays still.
9. Difference Between Base Isolation and
Other Retrofitting Techniques
Base Isolation Is Different Because..
• Applied under the structure rather than fitting it everywhere in the
building like other techniques of retrofitting.
• Saves a major amount of destruction.
• Maintenance Cost is less comparatively as it requires less look after.
• Buildings with base isolation are quite cost effective than a building which
is retrofitted.
10. Advantages
Structural Damage
restricted.
No Damage to indoor
services and
facilities(gas or water
pipelines).
Protects the structure
by preventing plastic
deformation of
structural elements.
Secondary damage
(Falling furniture) is
restricted.
Function of buildings is
ensured as super
structure is designed to
remain elastic even
after an earthquake
happens.
Deflections and
stresses generated are
lower.
Allows for a reduction
in structural elements
of buildings with less
ductile detailing
needed.
Protect the contents
inside the building.
Safe For occupants.
Protects the integrity of
internal structures e.g.
stairs, internal walls ,
and partitions.
Widely Held
Conception that Base
Isolation is expensive.
In some cases it results
in a lower construction
cost overall.
11. Disadvantages
• Cannot be applied partially to structures unlike other
retrofitting
• Challenging to implement in an efficient manner
• Allowance for building displacements
• Inefficient for high rise buildings
• Not suitable for buildings rested on soft soil.
• Coupled foundations allow motion of some modes of the structure
to include a participating soil mass which increases inertia for these
modes, and would also allow energy to radiate back into the soil. A
Base Isolated building is decoupled from the soil by the isolators.
The lower support stiffness of the isolators makes the building
more susceptible to wind induced motion.
12. Types of Base Isolation
Base Isolation systems which uses:
Elastomeric Bearings
Sliding Systems
13. Elastomeric Base Isolation System
• Most widely Used Base Isolator.
• Made of Natural rubber or neoprene.
• Consist of thin rubber sheets bonded onto thin
steel plates and combined with an energy
dissipation mechanism.
14. Sliding Base Isolation Systems
• It is the second basic type of isolator.
• Works by limiting the base shear across the isolator
interface.
15. Spherical Sliding Base Isolation
Systems
• Another type of base isolator in which the
building is supported by bearing pads that
have a curved surface and low friction.
• During an earthquake, the building is free to
slide both vertically and horizontally.
16. Friction Pendulum Bearing
• Specially designed base isolators.
• Works on the principle of simple pendulum by
increasing natural time period of oscillation.
18. Is it an economic solution?
• Base isolation allows for a reduction in structural elements of the building
with less ductile detailing needed
• Widely held misconception that seismic isolation is expensive
• E.g. Union House built in Auckland in 1983 with base isolation produced
an estimated 7% cost saving in the total construction cost of $6.6m which
included a construction time saving of 3 months due to the structural form
requiring less seismic force, ductility demands and structural deformations
• As a general rule the inclusion of all aspects of seismic isolation in a new
structure will add no more than 3% to total construction cost and
considerably less when assessed against the benefits of isolation
• Contrary to belief, seismic isolation devices require no maintenance during
the life of the building
• Following any significant event they should be inspected to ensure bolts
and load plates are still in place.
• Devices do not need replacing after an earthquake unless the event was in
excess of their design specification in which case we recommend the
removal of some devices for testing.
• Because the building is protected from major damage, repair costs
following an earthquake will be lower to non-existent
20. Comparison of Base Isolated Structures
From Fixed Base Structures
Analytically it has been show that lead rubber bearings can bring about
20% savings in the reinforcement used.
COMPARISON OF QUANTITY OF REINFORCEMENTS
21. Base Isolation In India
Bhuji Hospital is the only building in
India which has adopted the base
isolation technique.
It is supported by 280 lead rubber
bearings (LRBs) and can stand a
force 10 tremor on Richter Scale.
The system is maintenance free and
does not incorporate electronics, Its
just rubber and lead.
22. Famous Projects In The World Using
Base Isolation
MM 21,Japan
Xindian Hospital, Taiwan
Coronado Bay Bridge, USA
23. Famous Projects In The World Using
Base Isolation
Berkeley Public Safety Bulding
Asian Art Museum, USA
Utah State Capitol, USA
24. Name Of Some Companies Using Base
Isolation
Dynamic Isolation Systems, USA
Holmes Consulting Group, New
Zealand
ARUP Group Limited
Seismic Isolation Engineering
Incorporation, Emeryville, CA (USA)
25. Government Initiatives
Initiation of Base Isolation techniques in the concept of
new buildings in some required parts of India.
Setting up a full scale 3D Earthquake testing facility to
test the behavior of 2 to 3 stories models of isolated
buildings or retrofitted buildings before they are actually
developed in the project area
As we are fully aware that the labours in our country
have limited knowledge about technology going on in the
world, so we must need to train them and make them
aware of such kind of technologies.
26. A Suggestion By Me:
Base Isolation should be used in India, parts
where it is utmost required.(ex- Jammu and
Kashmir, Ran of Kutch etc.)
Use of scrap tires rubber pads as isolators can
also work in place of LRBs.
New or modified form of isolation
techniques(STRPs) can be used in India.
Case study shows that types of isolators can serve positive force
resisting capacity up to 150% shear strain when loaded with axial
pressure of 8.6MPa. In this regards, the STRP isolators can serve the
purpose of the base isolation system of low-rise residential buildings.
27. References
Commercial Internet
Sites:
• www.wikipedia.com
• http://www.youtube.com
• http://www.robinsonseismic
.com
• www.ijetch.org
Some Universities And
Organizations Papers
• ISET Journal Of Earthquake
Technology
• Journal of Engineering Research
and Applications
• International Journal of Emerging
Technology and Advanced
Engineering
• Indian Institute Of Technology
(Kanpur).
28. A video that says it all..
Reference to Dynamic Isolation Systems