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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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
This document will help you learn an introductory part and some detailed information on Shallow Foundations. As I am presenting this document to you I wish you all a Happy learning arena. It is highly recommended for students taking a bachelor degree in Civil Engineering, also it is a good document for students who are doing final touches for their examinations.
Seismic performance of adjacent building using fluid viscous dampersAyaz Malik
This presentation highlights the effect of Fluid Viscous Dampers (FVDs) on the seismic performance of adjacent buildings connected through a ped-way. A part of this project also deals with the Qualitative Damage Analysis of the structure during an earthquake, with and without FVDs.
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
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
This document will help you learn an introductory part and some detailed information on Shallow Foundations. As I am presenting this document to you I wish you all a Happy learning arena. It is highly recommended for students taking a bachelor degree in Civil Engineering, also it is a good document for students who are doing final touches for their examinations.
Seismic performance of adjacent building using fluid viscous dampersAyaz Malik
This presentation highlights the effect of Fluid Viscous Dampers (FVDs) on the seismic performance of adjacent buildings connected through a ped-way. A part of this project also deals with the Qualitative Damage Analysis of the structure during an earthquake, with and without FVDs.
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
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
A report format presentation of earthquake-resistance construction techniques, stressing upon the relevance of such techniques in the architecture industry.
Seismic Retrofitting and repairs and rehabilitationsKumarS250747
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion or soil failure due to earthquakes.
There are several techniques which have come forward nowadays by which an existing structures can be modified and make it less prone to earthquakes.
There is no such technique to make the structure fully earthquake proof but seismic performance can be greatly enhanced through proper initial design or subsequent modifications.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
1. Technical Seminar Report on
BASE ISOLATION CONCEPT AND
TECHNIQUES
BY
M. PREM SAI
11H61A0135
DEPARTMENT OF CIVIL ENGINEERING
ANURAG GROUP OF INSTITUTIONS, VENKATAPUR,
HYDERABAD
2. CONTENTS
INTRODUCTION
BASE ISOLATION
CONCEPT OF BASE ISOLATION
PRINCIPLE OF BASE ISOLATION
SUITABILITY OF BASE ISOLATION
FIXED BASE STRUCTURE VS ISOLATED
BASE STRUCTURE
ISOLATION COMPONENTS
ISOLATOR LOCATIONS
IN REAL SCENARIO
APPLICATIONS
CONCLUSION
3. 1. INTRODUCTION
Earthquake by itself, is not a disaster, it is natural phenomenon
result from ground movement, sometimes violent.
These produce surface waves, which cause vibration of the
ground and structures standing on top.
Depending on the characteristics of these vibrations, the
ground may develop cracks, fissures and settlements.
4. The possible risk of loss of life adds a very serious dimension to
seismic design, putting a moral responsibility on structural
engineers.
In recent times, many new systems have been developed,
either to reduce the earthquake forces acting on the
structure or to absorb a part of seismic energy.
One of the most widely implemented and accepted seismic
protection systems is base isolation.
1. INTRODUCTION
5. 2. 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.
Seismic isolation is a design strategy, which uncouples the
structure for the damaging effects of the ground motion.
6. The term isolation refers to reduced interaction between structure
and the ground.
When the seismic isolation system is located under the structure, it is
referred as “base isolation”.
The other purpose of an isolation system is to provide an additional
means of energy dissipation, thereby reducing the transmitted
acceleration into the superstructure.
The decoupling allows the building to behave more flexibly which
improves its response to an earthquake.
2. BASE ISOLATION
7. 3. CONCEPT OF BASE ISOLATION
The concept of base isolation is explained through an
example building resting on frictionless rollers.
When the ground shakes, the rollers freely roll, but the building
above does not move.
Thus, no force is transferred to the building due to shaking of
the ground; simply, the building does not experience the
earthquake.
9. Now, if the same building is rested on flexible pads that offer
resistance against lateral movements, then some effect of
the ground shaking will be transferred to the building above.
The flexible pads are called base-isolators, whereas the
structures protected by means of these devices are called
base-isolated buildings.
The main feature of the base isolation technology is that it
introduces flexibility in the structure.
3. CONCEPT OF BASE ISOLATION
11. A careful study is required to identify the most suitable type
of device for a particular building.
Also, base isolation is not suitable for all buildings.
Most suitable structures for base-isolation are
Low to medium-rise buildings rested on hard soil underneath
High-rise buildings or buildings rested on soft soil are not
suitable for base isolation.
3. CONCEPT OF BASE ISOLATION
12. 4. PRINCIPLE OF BASE ISOLATION
The fundamental principle of base isolation is to modify the
response of the building so that the ground can move below
the building without transmitting these motions into the building.
A building that is perfectly rigid will have a zero period.
When the ground moves the acceleration induced in the
structure will be equal to the ground acceleration and there
will be zero relative displacement between the structure and
the ground.
13. The structure and ground move the same amount.
A building that is perfectly flexible will have an infinite
period.
For this type of structure, when the ground beneath the
structure moves there will be zero acceleration induced in
the structure and the relative displacement between the
structure and ground will be equal to the ground
displacement.
4. PRINCIPLE OF BASE ISOLATION
14. So in flexible structures the structure will not move, the
ground will.
4. PRINCIPLE OF BASE ISOLATION
15. 5. SUITABILITY OF BASE ISOLATION
Earthquake protection of structures using base isolation technique
is generally suitable if the following conditions are fulfilled
The subsoil does not produce a predominance of long period ground
motion.
The structure is fairly jointed with sufficiently high column load.
The site permits horizontal displacements at the base of the order of 200
mm or more.
Lateral loads due to wind are less than approximately 10% of the weight
of the structure.
16. 6. Fixed Base Structure vs Isolated Base
Structure
During earthquakes, the conventional structure without seismic
isolation is subjected to substantial story drifts, which may lead to
damage or even collapse of the building.
Whereas the isolated structure vibrates almost like a rigid body with
large deformations or displacements restricted by the isolation
bearings.
The decoupling effect gives this extra advantange to isolated
structures.
17. The lateral forces of the isolated building are not only
reduced in magnitude but also fairly redistributed over the
floors, which further mitigates the overturning moment of the
structure.
6. Fixed Base Structure vs Isolated Base Structure
20. Elastomeric Isolators
These are formed of horizontal layers of natural or synthetic
rubber in thin layers bonded between steel plates.
The steel plates prevent the rubber layers from bulging and so
the bearing is able to support higher vertical loads with only
small deformations.
Plain elastomeric bearings provide flexibility but no significant
damping and will move under service loads.
7. ISOLATION COMPONENTS
21. Methods used to overcome these deficits include lead cores in the
bearing, specially formulated elastomers with high damping and
stiffness for small strains or other devices in parallel.
7. ISOLATION COMPONENTS
22. Low Damping Natural or Synthetic Rubber Bearings
Elastomeric bearings use either natural rubber or synthetic
rubber (such as neoprene), which have little inherent damping,
usually 2% to 3% of critical viscous damping.
For isolation they are generally used with special elastomer
compounds (high damping rubber bearings) or in combination
with other devices (lead rubber bearings).
They are also flexible at all strain levels.
7. ISOLATION COMPONENTS
23. Lead Rubber Bearings
A lead-rubber bearing is formed of a lead plug force-fitted into
a pre-formed hole in an elastomeric bearing.
The lead core provides rigidity under service loads and energy
dissipation under high lateral loads.
Top and bottom steel plates, thicker than the internal shims, are
used to accommodate mounting hardware. The entire bearing
is encased in cover rubber to provide environmental protection.
7. ISOLATION COMPONENTS
24. When subjected to low lateral loads
(such as minor earthquake, wind or
traffic loads) the lead rubber bearing is
stiff both laterally and vertically.
The lateral stiffness results from the high
elastic stiffness of the lead plug and the
vertical rigidity (which remains at all
load levels) results from the steel-rubber
construction of the bearing.
7. ISOLATION COMPONENTS
25. Isolation Systems based on Sliding
The second most common type of isolation system uses sliding
elements between the foundation and base of the structure.
In this type of Isolation system, the sliding displacements are
controlled by high-tension springs or laminated rubber bearings,
or by making the sliding surface curved.
These mechanisms provide a restoring force to return the
structure to its equilibrium position.
7. ISOLATION COMPONENTS
26. Sliding isolator without Recentering capacity
This consists of a horizontal sliding surface,
allowing a displacement and thus dissipating
energy by means of defined friction between
both sliding components and stainless steel.
One particular problem with a sliding
structure is the residual displacements that
occur after major earthquakes.
7. ISOLATION COMPONENTS
27. Sliding Isolator with Recentering Capacity
Compared with sliding isolators, sliding isolation pendula (SIPs)
with recentering capacity have a concave sliding plate.
Due to geometry, each horizontal displacement results in a
vertical movement of the isolator.
The potential energy, stored by the superstructure, which has
been pushed to the top, automatically results in recentering the
bearing into neutral position.
7. ISOLATION COMPONENTS
28. They remain horizontally flexible, dissipate energy and
recenter the superstructure into neutral position.
7. ISOLATION COMPONENTS
29. Friction Pendulum System
The Friction pendulum system (FPS) is a sliding isolation system
wherein the weight of the structure is supported on spherical
sliding surfaces that slide relative to each other when the
ground motion exceeds a threshold level.
7. ISOLATION COMPONENTS
30. 8. Isolator Locations
The requirement for installation of a base isolation system is
that the building be able to move horizontally relative to the
ground, usually at least 100 mm.
The most common configuration is to install a diaphragm
immediately above the isolators.
If the building has a basement then the options are to install
the isolators at the top, bottom or mid-height of the
basements columns and walls.
32. 9. BASE ISOLATION IN REAL BUILDINGS
Seismic isolation is a relatively recent and evolving
technology. It has been in increased use since the 1980s, and
has been well evaluated and reviewed internationally.
Base isolation is also useful for retrofitting important buildings
(like hospitals and historic buildings).
By now, over 1000 buildings across the world have been
equipped with seismic base isolation.
33. In India, base isolation technique was first demonstrated after
the 1993 Killari (Maharashtra) Earthquake.
Two single storey buildings in newly relocated Killari town were
built with rubber base isolators resting on hard ground.
After the 2001 Bhuj (Gujarat) earthquake, the four-storey Bhuj
Hospital building was built with base isolation technique.
All were brick masonry buildings with concrete roof.
9. BASE ISOLATION IN REAL BUILDINGS
34. The figure shows the base isolation technique used in the Bhuj
Hospital building with the help of Base Isolators.
9. BASE ISOLATION IN REAL BUILDINGS
35. 10. APPLICATIONS
Base isolation provides an alternative to the conventional,
fixed base design of structures.
Base Isolation minimizes the need for strengthening measures
of adding shear walls, frames, and bracing by reducing the
earthquake forces imparted to the building.
Base isolation had the effect of reducing the earthquake
force demands on the superstructure to 30% of the demands
for a fixed-base structure.
36. 11. CONCLUSION
Seismic base isolation method has proved to be a reliable method of
earthquake resistant Design.
The success of this method is largely attributed to the development
of isolation devices and proper planning.
Adaptable isolation systems are required to be effective during a
wide range of seismic events.
Efforts are required to find the solutions for the situations like near
fault regions where wide variety of earthquake motions may occur.