Basic concepts of Earthquake- Resistant Design and...
Transcript of Basic concepts of Earthquake- Resistant Design and...
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Seminar on
Earthquake Resilient Construction for School Buildings
Naveed Anwar, PhD
Post-earthquake School Reconstruction Project
Basic concepts of Earthquake-Resistant Design and Construction
Day-1Session 1
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•Earthquakes cause disasters!• Why do they cause disasters?
• Understanding the Risk
•Can such disasters be minimized?• How can we reduce the consequences of such disasters
• Understanding the Response and Performance
• How structures, specially schools can be made safer
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Why do Earthquake Cause Disasters?
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What is a disaster
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Climate Change
Environmental Sustainability
Population Growth
Urbanization and Un-planned
development
Low Quality of Built Environment
Lack of Resources for Communities
Lack of post-event management and recovery, and re-bound capacity
Natural Phenomena
Disaster Hazard Exposure Vulnerability
Increased Consequences
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Seismic Risk
Seismic Risk = Seismic Hazard x Seismic Vulnerability
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What is Seismic Hazard
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9Source: Murty (2004)
For Hazard
Earthquake
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Arrival of Seismic Waves at a Site
Source: Murty (2004)
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Reducing illumination with distancefrom an electric bulb
Effected by “Medium in between”
Clear, FogReflection, Abortion
Source: Murty (2004)
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Seismic hazard Maps
Seismic hazard map of Asia, from the Global Seismic Hazard Assessment Program (GSHAP)http://www.seismo.ethz.ch/static/gshap/
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What is exposure
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Exposure to Seismic Hazard
• The people, property, assets, infrastructure that could be effected by the damage caused by earthquake
• No exposure > No disaster• Earthquake in a desert causes no disaster• Same earthquake in a crowded city is disastrous• Unoccupied building has no exposure to life, but exposure to assets still
present
• Nepal Earthquake of 2015 less disastorus due to reduced exposure• Schools closed• Day time, on a holiday
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What is vulnerability and its causes
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Seismic Vulnerability
• The weaknesses in the location and structure that will be exploited by the earthquakes
• Site Vulnerability• Soil type and profile that may amplify the hazard
• Structural Vulnerability• The factors that will increase the seismic demands and or reduce capacity
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Causes of Vulnerability
Innovate l Integrate l Collaborate
• Lack of awareness
• Inappropriate site location
• Poor soil condition
• Poor design and construction practice
• Inappropriate use of building materials
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Causes of Vulnerability
Innovate l Integrate l Collaborate
• Type of building construction (Brick/stone masonry, mud mortar, RCC
frame, timber frame etc.)
• Non-engineered construction
• Low quality of construction & building materials
• Negligence of existing building design codes
• Untrained masons
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The Special Case of Nepal
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Nepal lies in an active seismic belt
.
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The Historical Formation of the Earth
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Location of Nepal
• Nepal sits astride the boundary
between the Indian and the
Tibetan plates along which a
relative shear strain of about 2
cm per year has been
estimated.
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Location of Nepal
Innovate l Integrate l Collaborate
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Himalayan Range
• Existence of the Himalayan Range
with the world’s highest peaks is
evidence of the continued
tectonic activities beneath the
country. As a result, Nepal is very
active seismically.
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Continuous Movement
Indian subcontinent pushes against Eurasian, pressure is released in the form of earthquakes.
The constant crashing of the two plates forms the Himalayan mountain range.
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History of Earthquakes
• Nepal has a long history of
destructive earthquakes.
• The earliest recorded
earthquake event 1255.
• Significant earthquakes in 1833,
1934, 1960,1988 and 2015.
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History of Earthquake in Nepal
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Magnitude
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History of Earthquake in Nepal
History of Earthquake in Nepal
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Nepal: 2015 Earthquakes
Innovate l Integrate l Collaborate
• On April 25, 2015 at 11.56 NST
• 7.8 on Richter Scale
• Shallow: only 11 km below the ground
• >40 sec trembling
• Moved Kathmandu about 1.5m
• At least 240 aftershocks
• May 12, 2015: 7.3 on Richter Scale
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Nepal: 2015 Earthquakes
AFTERMATH
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Impacts of Nepal Earthquake
Kathmandu Durbar Square
Patan Durbar Square
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Impacts of Nepal Earthquake
Dharahara
Bhaktapur Durbar Square
Swoyambhu Boudha
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Impacts of Nepal Earthquake
Barpak Village Bhaktapur Kathmandu
Gorkha Sindhupalchowk Dhading
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Impacts of Nepal Earthquake
Nuwakot Kavrepalanchowk Rasuwa
Dolkha Makwanpur Sindhuli
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Nepal is exposed to High Seismic risk
Risk = Vulnerability X Hazard
Consequences - Disaster
(Death-Dollars-Downtime)
High Vulnerability High HazardHigh Risk
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How to Reduce Damage due to EarthquakesAnd save human lives and property
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What needs to be Done
Minimize Disaster Consequences
Reduce Risk to Disaster(and manage consequences due to disaster)
Reduce Vulnerability to match Acceptable Risk
Define Acceptable Risk
Determine the Hazard
(R = V x H)
Difficult to reduce Hazard
Difficult to reduce Exposure
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Hazard-Vulnerability-Risk-Consequences
Structural Displacement
Load
ing
Seve
rity
Resta
urant
Resta
urant
Resta
urant
Haz
ard
Vulnerability
Consequences
School
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Restaurant Restaurant
Resta
uran
t
Operational (O) Immediate Occupancy (IO) Life Safety (LS) Collapse Prevention (CP)
0 % Damage or Loss 99 %
Ref: FEMA 451 B
CasualtiesLowest Highest
Rehab Cost to Restore after eventLowest Highest
Downtime for RehabLowest Highest
School School
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Basic Concepts of Earthquake-Resistant Construction
Innovate l Integrate l Collaborate
Basic of Seismic Design on the application of construction techniques, methods and criteria
used for the design and construction of building structures exposed to earthquakes.
A. Proper Site Selection
B. Appropriate Planning
C. Good foundation resting on a Firm Base
D. Building has to act as a single unit for a good earthquake resistance
E. Better bonding within masonry
F. Controlled size and location of openings
G. Light construction
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Considerations for Site Selection
Proper Site Selection: Very important for stable & disaster safe construction
i. Steep & Unstable Slopes
ii. Areas susceptible to landslides & rock fall
iii. Filled area
iv. River banks
v. Water logged area
vi. Geological fault & Ruptured areas
vii. Trees
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Earthquake effects are Different
• Earthquake is different from all other loads• It is not an applied external force
• Earthquake effects are generated by the structure itself in response to ground shaking• Basically depends on stiffness and mass distribution
• Can be controlled by damping, ductility and energy dissipation mechanisms
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Concept of 100% g (1g)
Most loads
Earthquake
FFKuuCuM NL
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Earthquake Inertial Forces
Source: Murty, (2004)
Effect of Inertia in a building when
shaken at its base
Flow of seismic inertia forces
through all structural
components
Inertia force and
relative motion within a
building
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Building Behavior during Earthquakes
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Appropriate Planning
• Shape, size and proportion of the building
• Sudden deviation in load transfer path along the height lead to poor performance of buildings.
(a) Setbacks
(b) Weak or Flexible Story
(c) Sloppy Ground (d) Hanging or Floating Columns
(e) Discontinuing Structural Members
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Appropriate Planning
Regular Configuration: Seismically ideal.
• Low heights to base ratio
• Symmetrical plane
• Uniform section & elevation
• Balanced resistance
These configurations would have maximum torsional resistance due to
location of shear walls and bracings. Uniform floor heights, short spans and
direct load path play a significant role in seismic resistance of the building.
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Appropriate Planning
Irregular Configuration:
Buildings with irregular configuration
Buildings with abrupt changes
in lateral stiffness
Buildings with abrupt changes
in lateral resistance
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Appropriate Planning
Fig. Buildings with one of their overall dimensions
much larger or much smaller than the other two, do
not perform well during earthquake.
Fig. Simple plan shape buildings do well during earthquake
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Appropriate Planning
Adjacency of building:
• 2 buildings too close to each other, may
pound on each other during strong
shaking.
• With increase in building height, this
collision can be a greater problem.
• When the two building heights do not
match, the roof of the shorter building may
pound at the mid-height of the column of
the taller one. This is very dangerous.
Fig. Pounding can occur between adjoining
buildings due to horizontal vibrations of the
two buildings.
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Appropriate Planning
• Architectural features that are detrimental to earthquake response of
buildings should be avoided or minimized.
• When irregular building features are included, a considerably higher
level of engineering effort is required in the structural design. Even after
doing so the building may not be as good as one with simple
architectural features.
• Decisions made at the planning stage on building configuration are
more important.
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Earthquake-Resistant Construction
The building has to act as a single unit for a good earthquake resistance:
Can be achieved by incorporating;
• Vertical Reinforcement
• Horizontal bands well connected to the vertical reinforcements and
embedded in masonry
• Diagonal bracing (horizontal and vertical)
• Lateral restraints
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Proper Load Path
Fig. Load path from structure slab to the ground
The structural frame must
have enough strength to
securely bear the gravity
loads throughout the entire
life span of the building..
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Earthquake-Resistant Construction
An adequate load bearing system is based on a continuous load path
throughout the structure:
• Slabs carry the floor loads of each story.
• Beams carry the loads transferred to them by the slabs as well as the
weight of the walls seated on them.
• Columns carry the beam loads and they transmit them to the foundation.
• Footings (foundation) carry the column loads and transfer them to the
ground.
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Earthquake-Resistant Construction
Structural frame must be
able to withstand not
only the gravity loads but
also the loads imposed in
a few but vital cases
during its life span such as
during an earthquake.
Fig. Frame deformation due to seismic action
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Earthquake-Resistant Construction
• A seismic band is the most critical earthquake-resistant provision usually in a masonry building.
• Usually provided at lintel, floor, and/or roof level in a building, the band acts like a ring or belt.
• Seismic bands hold the walls together and ensure integral
box action of an entire building.
A seismic band acts like a belt (adapted from: GOM 1994)
Pulling and bending of a lintel band in a stone
masonry building (adapted from: Murty 2005)
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Earthquake-Resistant Construction
• Seismic bands are constructed using
either reinforced concrete (RC) or
timber.
• Proper placement and continuity of
bands and proper use of materials and
workmanship are essential for their
effectiveness.
Locations of seismic bands in a stone masonry building
(roof omitted for clarity) (adapted from: UNCRD 2003)
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Earthquake-Resistant Construction
Seismic bands should always be continuous; an offset in elevation is not acceptable (adapted from: GOM 1998)
RC seismic bands should always remain level without any
dips or changes in height (adapted from: GOM 1998)
Merging RC floor and lintel bands
Combining floor/roof and lintel band:
a) timber band, and b) RC band
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Importance of Foundations
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Good foundation resting on a Firm Base foundation
:
Quality of foundation and the base
on which the foundation rests
Fig. Structural Foundation
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Good foundation
Innovate l Integrate l Collaborate
Fig. Strip Footing on Brick and Stone Masonry
Vertical
Reinforcement
Tie Beam
Horizontal
ReinforcementShear
Reinforcement
PCC
Brick
Soling
Stone Masonry
Reinforcement
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62
Good foundation resting on a Firm Base
Innovate l Integrate l Collaborate
: Quality of foundation and the base on which the foundation rests
Fig. Foundation consisting of flexible & rigid spread footings
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Good foundation
Fig. Foundation consisting of flexible spread footings and connecting beams
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64
Good foundation
Innovate l Integrate l CollaborateFig. Strip Foundation with connecting beams
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65
Good foundation
Innovate l Integrate l CollaborateFig. Foundation consisting of spread footings eccentrically constructed
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66
Good foundation
Innovate l Integrate l CollaborateFig. Raft Foundation consisting connecting beams Fig. Two level foundation
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Proper Foundation
Different foundation depths are required for building
sites with variable soil properties (source: GOM 1998)
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Special Considerations for Massonry
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Better bonding within masonry
Better bonding within masonry: Type & quality of bond within the walling units
Based on the type of individual units used for masonry walls and their
functions, types of masonry walls:
• Load Bearing Masonry Walls
• Reinforced Masonry Walls
• Hollow Masonry Walls
• Composite Masonry Walls
• Post-tensioned Masonry Walls
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Better bonding within masonry
Fig. Load Bearing Masonry Walls Fig. Reinforced Masonry Wall
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Better bonding within masonry
Fig. Hollow Masonry Wall
Fig. Composite Masonry Wall
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Better bonding within masonry
Fig. Post-tensioned Masonry Wall
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73
Better bonding within masonry
Fig. Good bonding with stone masonry
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Better bonding within masonry
Proper placement of through-stones in stone
masonry walls (adapted from: GSDMA 2001)
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75
Better bonding within masonry
Through-stones in stone masonry walls: a) through stones act like interlaced fingers; b) a wall with through-stones, and c) a wall without through-stones (source: GOM 1998)
Wooden battens can be alternatively used instead
of long stones at wall (adapted from: Bothara et al. 2002)
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76
Better bonding within masonry
Other Alternative Ways instead
of long stones.(adapted from: Bothara et al. 2002)
Wall stitches made from reinforced concrete with steel reinforcement
Construction of stitches made from wire mesh
embedded in mortar at the wall intersection Stitches made from wood dowels at wall corners and intersections
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77
Better bonding within masonry
Innovate l Integrate l Collaborate
Fig. Good bonding with brick masonry
Vertical
Reinforcement
Horizontal
Reinforcement
U-Hook
Vertical
Reinforcement
U-HookHor.
Reinforcement
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Masonry failure mechanisms
Fig. (a) Joist Displacement; (b) Joint Slipping; (c) Unit direct tensile cracking; (d) Masonry crushing; (e) Unit diagonal tensile cracking.
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Masonry failure mechanisms
Fig. Masonry building during earthquake shaking: (a) loosely connected walls without
slab at the roof level; (b) a building with well-connected walls and a roof slab
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Controlled size and location of openings
• Location and size of openings in walls has significance in deciding the
performance of masonry buildings in earthquakes
Recommendations regarding the length
and story height of stone masonry walls
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Controlled size and location of openings
• Large un-stiffened openings
create soft story effect
leading to a deformation of
building during an
earthquake.
• To prevent such effects the
opening size and location
has to be controlled.
Recommended location and size of openings for stone masonry walls (source: IAEE 2004)
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Controlled size and location of openings
Figure: Regions of force transfer
from weak walls to strong walls in
a masonry building.
Wall B1 pulls walls A1 & A2, while
wall B2 pushes walls A1 & A2.
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Shera Board
GFRG PanelCGI Sheet
Plywood/OSBGypsum Board
Fiber Cement Board
Light construction
Lighter structures absorbs less seismic force, hence less effect.
Different types of light weight materials available in Nepal
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84
Features for Rural Masonry Houses
Innovate l Integrate l Collaborate
• Horizontal Bands in different levels
• Corner strengthening with stitches
• Vertical Reinforcement
• Tying floor/roof rigidly with lateral load resisting elements
(walls/columns)
• Diagonal Bracing
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Conclusion
• Building has to act as a single unit for a good earthquake resistance.
• Should be designed with the application of proper seimic design and construction principles
• Proper Site Selection
• Appropriate Planning
• Good foundation resting on a firm Base
• Better bonding within masonry
• Controlled size and location of openings
Innovate l Integrate l Collaborate
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Even if the buildings are designed properly using the best practices…
They can not perform well in earthquakes if the construction is not done properly!
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Reference
• Amod M. Dixit, 2004, 13th World Conference on Earthquake Engineering, Vancouver, B.C.,
Canada, Promoting Safer Building Construction in Nepal
• Ministry of Physical Planning and Works, Earthquake Risk Reduction and Recovery
Preparedness Programme for Nepal
• gharpedia.com. How Configuration of the Building Affect During Earthquakes?
• Building How: Earthquake Resistant Buildings
• Satish Kambaliya, Earthquake and Earthquake Resistant Design
Innovate l Integrate l Collaborate