This document summarizes earthquake resistant techniques. It discusses conventional methods like strengthening buildings through stiffness and ductility. Advanced methods of base isolation and energy dissipation devices are explained. Case studies on buildings like Torre Mayor and Transamerica Pyramid are provided. Techniques under research like shape memory alloys, mussel fibers, visco-elastic dampers and rubber cloaking are outlined. Seismic zones and codes in India are briefly covered along with references.
A report format presentation of earthquake-resistance construction techniques, stressing upon the relevance of such techniques in the architecture industry.
The devastating Effects of earthquake is notable to all. Recently we all saw the destruction of nepal by the same. So if we increasing the resistance of building to earthquake we can reduce its effect as we cannot stop the earthquake!!!
Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
A report format presentation of earthquake-resistance construction techniques, stressing upon the relevance of such techniques in the architecture industry.
The devastating Effects of earthquake is notable to all. Recently we all saw the destruction of nepal by the same. So if we increasing the resistance of building to earthquake we can reduce its effect as we cannot stop the earthquake!!!
Basic points on earthquake resistant building
- Design considerations and different techniques employed to resist building from collapse during earthquake
tells about how the earthquakes are happen, effect of earthquakes on buildings and design methods to be followed to design earthquake resistance building.
shear walls are vertical elements of the horizontal force resisting system. Shear walls are constructed to counter the effects of lateral load acting on a structure.
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
tells about how the earthquakes are happen, effect of earthquakes on buildings and design methods to be followed to design earthquake resistance building.
shear walls are vertical elements of the horizontal force resisting system. Shear walls are constructed to counter the effects of lateral load acting on a structure.
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
A technical approach to designing earthquake resistant buildings. Contains a brief overview of why a structure fails, building foundation problems and what are the possible solutions
DESIGN AND ANALYSIS OF EARTH-QUAKE RESISTANT FOR MULTI-STORIED BUILDING ON A ...Ijripublishers Ijri
his project named as “DESIGN OF EARTH-QUAKE RESISTANT MULTI-STORIED RCC BUILDING ON A SLOPING
GROUND” involves the analysis of simple 2-D frames of varying floor heights and varying no of bays using a very popular
software tool STAAD Pro. Using the analysis results various graphs were drawn between the maximum axial force,
maximum shear force, maximum bending moment, maximum tensile force and maximum compressive stress being
developed for the frames on plane ground and sloping ground. The graphs used to drawn comparison between the two
cases and the detailed study of “SHORT COLOUMN EFFECT” failure was carried up. In addition to that the detailed
study of seismology was undertaken and the feasibility of the software tool to be used was also checked. Till date many
such projects have been undertaken on this very topic but the analysis were generally done for the static loads i.e. dead
load, live load etc, but to this the earthquake analysis or seismic analysis is to be incorporated. To create a technical
knowhow, two similar categories of structures were analyzed, first on plane ground and another on a sloping ground.
Then the results were compared. At last the a structure would be analyzed and designed on sloping ground for all possible
load combinations pertaining to IS 456, IS 1893 and IS 13920 manually.
The project "Effect of subsurface barrier on seismic waves" was done as part of Structural Dynamics and Earthquake Engineering Course at Virginia Tech.
Description:
• Conducted a shake table experiment with different subsurface conditions using soil and wood and subjected it to longitudinal waves to study wave propagation.
• Compared the experimental values with the ones from STRATA theoretical model.
A Study on Stabilzation of Black Cotton Soil Using Ferric ChlorideIOSR Journals
Expansive soils such as black cotton soil are very susceptible to detrimental volume changes, with changes in moisture. This behavior of soil is attributed to the presence of mineral Montmorillonite which has expanding lattice; Expansive soils because of their specific physical & chemical make are subjected to volume changes. In many countries including India, these soils are so extensive that alteration of highway route to avoid the material is virtually impossible. Various remedial measures like soil replacement, prewetting, moisture control, lime stabilization etc have been practiced with varied degree of success. Extensive research is going on to find the solutions to black cotton soils. Recent investigations on chemical stabilization revealed that strong electrolytes like potassium chloride, Ferric chloride can be used in place of conventionally used lime due to their ready dissolvability in water and supply of adequate cations for ready cation exchange. In the present work experimentation is carried out to investigate efficacy of ferric chloride and fly ash in improving the properties of black cotton soil.
Earthquake resistant building is an important for livelihood .To overcome the problem of earthquakes,it is necessary to find the methods of resisting of Earthquakes.so it provides better livelihood for people and lives
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities. The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. The word tremor is also used for non-earthquake seismic rumbling.
At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.
In its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter.
Advanced Earthquake Resistant Building Techniquesijtsrd
Apart from the modern techniques which are well documented in the codes of practice, there are some other old traditional earthquake resistant techniques which have been proved to be more effective for resisting earthquake loading and are also cost effective with easy constructability. Victor Jebaraj R | Brightsingh Arulraj "Advanced Earthquake Resistant Building Techniques" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-4 , June 2020, URL: https://www.ijtsrd.com/papers/ijtsrd31636.pdf Paper Url :https://www.ijtsrd.com/engineering/civil-engineering/31636/advanced-earthquake-resistant-building-techniques/victor-jebaraj-r
For seismic design of building structures, the conventional method, i.e., strengthening the stiffness, strength, and ductility of the structures, has been commonly used for a long time. Therefore, the dimensions of structural members and the consumption of material are expected to be increased, which leads to higher cost of the buildings as well as larger seismic responses due to larger stiffness of the structures. Thus, the efficiency of the traditional method is constrained. To overcome these disadvantages associated with the traditional method, many vibration-control measures, called structural control, have been studied over recent years. Structural Control is a diverse field of study. Structural Control is the one of the areas of current research aims to reduce structural vibrations during loading such as earthquakes and strong winds. In terms of different vibration absorption methods, structural control can be classified into active control, passive control, hybrid control, semi-active control and so on. The passive control is more studied and applied to the existing buildings than the others. Base isolation is a passive vibration control system that does not require any external power source for its operation and utilizes the motion of the structure to develop the control forces. Performance of base isolated buildings in different parts of the world during earthquakes in the recent past established that the base isolation technology is a viable alternative to conventional earthquake-resistant design of medium-rise buildings. The application of this technology may keep the building to remain essentially elastic and thus ensure safety during large earthquakes. Since a base-isolated structure has fundamental frequency lower than both its fixed base frequency and the dominant frequencies of ground motion, the first mode of vibration of isolated structure involves deformation only in the isolation system whereas superstructure remains almost rigid. In this way, the isolation becomes an attractive approach where protection of expensive sensitive equipment and internal non-structural components is needed. It was of interest to check the difference between the responses of a fixed-base building frame and the isolated-base building frame under seismic loading. This was the primary motivation of the present study.
hie guys
Its a small presentation on Earthquake Resistant Structures
some basic fundamentals about its causes its effect and few techniques to resist it..
Seismic Retrofitting of RC Buildingwith Jacketing and Shear Wall Seismic Ret...Bala murali
It is a part of retrofitting i.e. repair, renovation, strengthening.
Retrofitting is the modification of existing structures to make them more resistant.
Jacketing is the most popularly used method for strengthening of building columns.
Jacketing consists of added concrete with longitudinal and transverse reinforcement around the existing column.
It improves axial and shear strength of column and major strengthening of foundation may be avoided.
Earthquake resistant structure By Engr. Ghulam Yasin TaunsviShan Khan
The resistance structure is structures designed to withstand earthquakes. While no structure can be entirely immune to damage from earthquakes, the goal of earthquake-resistant construction is to erect structures that fare better during seismic activity than their conventional counterparts.
1. BY-
Shreya Thusoo
10403EN006
IDD PART IV
SUPERVISED BY-
Prof. RAJESH KUMAR
Dept. of Civil Engineering
IIT(BHU), Varanasi
SEMINAR ON
EARTHQUAKE RESISTANT
TECHNIQUES
2. INTRODUCTION
Some centuries back, landmark structures used to have:
heavy masonry cladding
wall curtains
strong bracings
As need for taller buildings grew, advanced innovative devices
were introduced in structures.
The Todaiji Temple in Japan has log house construction
that has resisted earthquakes thousands of years (most number any structure has survived).
3. EARTHQUAKE
They are natural disasters of a generally unpredictable nature.
It is the shaking of the earth due to the movement of earth’s
crust.
Terms:
Fault plane
Hypocenter
Epicentre
6. CONVENTIONAL METHODS
Some of the general design concepts:
Follow current earthquake standards and codes.
Provide strong foundation.
Use best quality materials.
Avoid irregular shaped structures and framing system.
Maintain integrity by providing seismic bands:
At the plinth level of the building.
At the levels of lintels of doors and windows.
Vertical reinforcing bars at all wall junctions.
Introduce shear walls to transfer seismic loads down to
the bottom of foundation.
7. CONVENTIONAL METHODS
Remedial measured for soft storey buildings.
(a) bracings in columns of open ground storey, (b) Providing R.C. shear wall and (c)
Providing brick infills between columns.
(a) (b) (c)
8. ADVANCED METHODS
Basic approach is to reduce the earthquake
generated forces acting upon the building;
rather than strengthening it.
Two main techniques:
Base isolation
Energy dissipation devices
9. BASE ISOLATION DEVICES
Spherical Sliding Isolation Systems
Lead rubber bearings
Base Isolation Devices - separate building from
building foundation by bearing pads.
10. BASE ISOLATION DEVICES
Supported by a series of bearing pads which are placed
between the building and the building's foundation.
In case of an earthquake:
Fixed base building deform
and are damaged.
Base isolated building rocks
back and forth like a boat.
Shaking is reduced
by
as much as 5 times
11. ENERGY DISSIPATION DEVICES/
SEISMIC DAMPERS
•Viscous Dampers utilized the forced
movement of fluids within the damper
Special devices introduced in building absorb the energy
produced by seismic waves.
•Friction Dampers these utilize
frictional forces to dissipate energy
•Metallic Dampers utilize the
deformation of metal elements within
the damper
12. CASE STUDIES -Torre Mayor
Intrinsic Bracing System
Large Viscous Dampers
252 Reinforced concrete piles on the
foundation.
46,916 m3 of concrete.
21,200 tons. of structural and
reinforcement steel.
98 fluid viscous seismic dampers.
Calculated to exceed the seismic
requirements of the Mexico city and
California Construction Regulations,
which are the strictest in the world.
13. CASE STUDIES –Transamerica
Pyramid
Unique Truss System with
X-Bracing above first floor
to support vertical,
horizontal and torsional
forces.
Overhead horizontal X-
Bracing to support
torsional movement in
vertical direction.
In the 1989 Loma Prieta, California earthquake, it swayed more than 1 foot
but was not damaged at all.
15. CASE STUDIES –Taipei 101
It uses a tuned mass damper, also known
as a harmonic absorber
Steel sphere 18 feet across and weighing
728 ton
Suspended from the 92nd to the 87th floor
Device consists of:
1. Massive steel ball that sways to
counteract the building’s movement
2. Eight steel cables form a sling to
support the ball
3. Eight viscous dampers act like shock
absorbers when the sphere shifts
4. Two additional tuned mass dampers for
additional protection
The ball can move 5 ft. in any direction and
reduce sways by 40 percent
16. TECHNIQUES UNDER RESEARCH
SHAPE MEMORY ALLOYS
Bounce back after experiencing large loads.
Used in bearings, columns and beams and connecting
elements.
Most common alloys used are copper-zinc-aluminum-
nickel, copper-aluminum-nickel or nickel-titanium.
17. TECHNIQUES UNDER RESEARCH
MUSSEL FIBERS
Elastomeric fibers combine stiffness and flexibility which helps
mussel to attach to hard surfaces.
Construction materials made of a similar blend of firm and
flexible parts could help buildings withstand high-stress forces
during an earthquake.
Ratio of stiff-to-flexible
fibers = 80:20.
18. TECHNIQUES UNDER RESEARCH
VISCO-ELASTIC DAMPERS CST30
Two layer of high damping rubber sandwiched between
steel plates.
Absorb energy produce from vibrations.
19. TECHNIQUES UNDER RESEARCH
VISCO-ELASTIC DAMPERS CST30
Advantages over traditional damping system.
Effective utilization of interior space.
Improvement in the degree of freedom of design.
Accepts different vibration types.
High performance and high quality.
Environmental friendliness.
Maintenance free.
20. TECHNIQUES UNDER RESEARCH
RUBBER CLOAKING DEVICE
Rubber 'cloaking device' could make buildings immune to
earthquakes.
Waves can be made to bend their path by various techniques.
Seismic waves can also be redirected. This is called ‘cloaking’.
21. TECHNIQUES UNDER RESEARCH
RUBBER CLOAKING DEVICE
• INSTALLATION: Concrete-and-plastic plate of concentric rings encircles
the foundation.
• DETOUR: During earthquake, bending force deflects waves from their
path toward a stiffer ring away from the building.
• EXIT: About halfway around plate, bending force weakens; waves' forward
momentum propels them on their original path.
22. WORK ON EARTHQUAKE RESISTANCE
IN INDIA
In India, base isolation technique was first
demonstrated after 1993 Killari earthquake. Two
single storey building were built with rubber base
isolators resting on hard ground.
The four storey bhuj hospital building was built with
base isolation technique after 2001 bhuj earthquake.
23. IS CODES FOR EARTHQUAKE RESISTANT
DESIGN
IS 1893 (Part 1), 2002, Indian Standard Criteria For Earthquake
Resistant Design of Structures (5th revision).
IS 4326, 1993, Indian Standard Code of Practice for Earthquake
Resistant Design and Construction of Buildings (2nd revision).
IS 13827, 1993, Indian Standard Guidelines for Improving
Earthquake Resistant of Earthen Buildings.
IS 13828, 1993, Indian Standard Guidelines for Improving
Earthquake Resistant of Low Strength Masonry Buildings.
IS 13920, 1993, Indian Standard Code of Practice for Ductile
Detailing of Reinforced Concrete Structures Subjected to
Seismic Forces.
25. REFERENCES
[1]. Morris, Neil; Earthquakes; Crabtree Publishing Company; 1998.
[2]. Mazza and Vulcano; Base-isolation techniques for the seismic protection of RC
framed structures subjected to near-fault ground motions; Paper No. 2935; 13th
World Conference on Earthquake Engineering at Vancouver, B.C., Canada; August
1-6, 2004.
[3]. Kelly, Skinner and Heine; Mechanisms of energy absorption in special devices for
use in earthquake resistant structures; Bulletin of N.Z. Society for Earthquake
Engineering, Vol. 5 No. 3, September 1997.
[4]. Seismic Protection with Fluid Viscous Dampers for the Torre Mayor, a 57-Story
Office Tower in Mexico City, Mexico; Publisher: Taylor Devices, Inc.;Date: 2011-
02-18.
[5]. Kourakis, Ioannis; Structural systems and tuned mass dampers of super-tall
buildings: case study of Taipei 101; Publisher: Massachusetts Institute of
Technology; 2007.
[6]. Farhat, Guenneau and Enoch, Flexural waves on a thin elastic plate are smoothly
bent around an obstacle ("E") surrounded by a metamaterial cloak, Volume 103,
Issue 2, DOI 10 July 2009.