Disaster management and seismic retrofitting
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Disaster Management and Seismic Retrofitting
Dr K M Soni
Chief Engineer, CPWD, Mumbai
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Major Disasters Worldwide
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Sl. No.
Name of Event Year Country and Region
Fatalities in the known history
1 Earthquake 1556 China, Shaanxi 830000
2 Earthquake 1731 China 100000
3 Cyclone 1737 India, Calcutta 300000
4 Yellow River flood 1887 China 9,00,000-20,00,000
5 Messina Earthquake 1908 Italy 123000
6 Earthquake 1920 China, Gansu 235000
7 Great Kanto Earthquake 1923 Japan 142000
8 Great Chinese Famine 1958-1961 China
1958-1961 China 150,00,000-430,00,000
9 Bhola Cyclone 1970 West Bengal, India & B/desh
5,00,000
10 Tangshan Earthquake 1976 China 2,42,419
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HAITI’S E/Q, 12.1.2010; DEATHS-3,16,000; MAGNITUDE:7
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TANGSHAN, CHINA, 27.7.1976; DEATHS-242,769; MAG. 7.5
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SUMATRA E/Q, 26.12.2004DEATHS;2,27,898MAG. 9.1
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Haiyuan, chinae/q 16.12.1920Deaths; 2,00,000Mag. 7.8
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Kanto, e/q, Japan; 1.9.1923Deaths-1,42,800Magnitude: 7.9
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Pakistan e/q, 18.10.2005Deaths; 86000Mag-7.6
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Iran e/q, 20.6.1990Deaths-50,000Mag. 7.4
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Gujarat e/q, 26.1.2001Deaths-20,085, Mag. 7.6
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Latur, india e/q 29.3.1993Deaths – 9748Mag. 6.2
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NEPAL EARTHQUAKE
12
2015, Magnitude: 7.9, deaths over 5000
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AFGHANISTAN EARTHQUAKE
14
26th October, 2015
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Disasters in India
• Natural disasters– Earthquakes
– Floods
– Cyclones
– Tsunamis
– Droughts
– Landslides
• Man made disasters– Road/Rail accidents
– Chemical disasters
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Major Disasters in India
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S. No. Name of Event Year State & Area Fatalities
1. Floods October 2014 Jammu & Kashmir
2.Cyclone Hud
Hud
September
2014
Andhra Pradesh &
Odisha
3. Odisha Floods October 2013 Odisha 21
4. Andhra Floods October 2013 Andhra Pradesh 53
5.Cyclone Phailin October 2013 Odisha and Andhra
Pradesh
23
6.Floods/Landslid
es
June 2013 Uttarakhand and
Himachal Pradesh
4,094
7.Cyclone
Mahasen
May 2013 Tamil Nadu 08
8. Cyclone Nilam October 2012 Tamil Nadu 65
9.
Uttarakhand
Floods
Aug – Sep
2012
Uttarkashi,
Rudraprayag and
Bageshwar
52
10.Assam Floods July – Aug
2012
Assam ---
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S. No. Name of Event Year State & Area Fatalities
11.Cyclone Thane December
2011
Tamil Nadu,
Puducherry
47
12.Sikkim Earthquake September
2011
Sikkim, West Bengal,
Bihar
60
13.Odisha Floods September
2011
19 Districts of Odisha 45
14.
Sikkim Earthquake 2011 North Eastern India
with epicenter near
Nepal Border and
Sikkim
97 people died (75 in
Sikkim)
15. Cloudburst 2010 Leh, Ladakh in J&K 257 people died
16. Drought 2009252 Districts in 10
States-----
17.Krishna
Floods2009
Andhra Pradesh,
Karnataka300 people died
18. Kosi Floods 2008 North Bihar
527 deaths, 19,323
livestock perished,
2,23,000 houses
damaged, 3.3 million
persons affected
19. Cyclone Nisha 2008 Tamil Nadu 204 deaths
20. Maharashtra Floods July 2005 Maharashtra State
1094 deaths
167 injured
54 missing4th July 2017 18Disaster management
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S. No. Name of Event Year State & Area Fatalities
21. Kashmir 2005Mostly Pakistan,
Partially Kashmir
1400 deaths in Kashmir (86,000
deaths in total)
22. Tsunami 2004
Coastline of Tamil Nadu,
Kerala, Andhra Pradesh,
Pondicherry and
Andaman and Nicobar
Islands of India
10,749 deaths
5,640 persons missing
2.79 million people affected
11,827 hectares of crops damaged
300,000 fisher folk lost their
livelihood
23.Gujarat
Earthquake2001
Rapar, Bhuj, Bhachau,
Anjar, Ahmedabad and
Surat in Gujarat State
13,805 deaths
6.3 million people affected
24.Orissa Super
Cyclone1999 Orissa Over 10,000 deaths
25. Cyclone 1996 Andhra Pradesh
1,000 people died, 5,80,000 housed
destroyed, Rs. 20.26 billion
estimated damage
26.Latur
Earthquake1993
Latur, Marathwada
region of Maharashtra
7,928 people died
30,000 injured
27. Cyclone 1990 Andhra Pradesh967 people died, 435,000 acres of
land affected
28. Drought 1987 15 States 300 million people affected
29. Cyclone 1977 Andhra Pradesh
10,000 deaths
hundreds of thousands homeless
40,000 cattle deaths
30. Drought 1972 Large part of the country 200 million people affected
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Cascading Effect
• Earthquake
• Tsunami
• Fire
• Nuclear disaster
• Floods
• And so on...
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Road Accidents
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Vulnerability Profile
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Of the 7,516 km longcoastline, close to 5,700km (@76%) is prone tocyclones and tsunamis.
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58.6 per cent of thelandmass is prone toearthquakes of moderateto very high intensity.
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Over 40 million hectares(12 % of land) is prone tofloods and river erosion.
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Disaster Management Act
On 23 December 2005, the Government ofIndia enacted the Disaster Management Act,which envisaged the creation of NationalDisaster Management Authority (NDMA),headed by the Prime Minister, and StateDisaster Management Authorities (SDMAs)headed by respective Chief Ministers, tospearhead and implement a holistic andintegrated approach to Disaster Managementin India.
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Functions & Responsibilities• Lay down policies on disaster management ;• Approve the National Plan;• Approve plans prepared by the Ministries or Departments of the Government of
India in accordance with the National Plan;• Lay down guidelines to be followed by the State Authorities in drawing up the
State Plan;• Lay down guidelines to be followed by the different Ministries or Departments of
the Government of India for the Purpose of integrating the measures forprevention of disaster or the mitigation of its effects in their development plansand projects;
• Coordinate the enforcement and implementation of the policy and plans fordisaster management;
• Recommend provision of funds for the purpose of mitigation;• Provide such support to other countries affected by major disasters as may be
determined by the Central Government;• Take such other measures for the prevention of disaster, or the mitigation, or
preparedness and capacity building for dealing with threatening disastersituations or disasters as it may consider necessary;
• Lay down broad policies and guidelines for the functioning of the NationalInstitute of Disaster Management.
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Themes of the policy
• Community-based disaster management,including last mile integration of the policy,plans and execution.
• Capacity development in all related areas.• Consolidation of past initiatives and best
practices.• Cooperation with agencies at the national,
regional and international levels.• Compliance and coordination to generate a
multi-sectoral synergy.
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Disaster Management Cycle
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Prevention and Mitigation&
Capacity Building
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Disaster Management
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Disaster Management
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Prepare
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Capacity Buildingto deal with new works to deal with
disasters, retrofitting and repair/rehabilitation
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Damage/poor maintenance enhances risk of damage/collapse of structures
during disasters
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Types of Damages
• Damages could include both Structural and Non-Structural• Non structural damage could include:
• Plaster, • Panel/filler walls, parapets • Doors, windows, window glass panes etc• Dislocation of civil services like water supply, gas, drainage pipes and
electrical conduits/wiring• Disturbed Roofing Tiles• Flooring at ground level, etc
• Structural damage could cover • Foundation system• Load bearing walls • RCC beams/columns• Roofing• Lintels over door/windows, etc
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Sequence of Operation
• Removal of Hazardous Components
• Propping & Supporting, wherever required
• Condition Survey to Determine Rehabilitation
• Evaluate Damage to each Structural
Component
• Restoration and strengthening
– Appropriate Structural Repair Method
– Non structural repairs covering civil &
electrical items
• Finish the Repaired Structure
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Structural Damage Assessment
• Important to conduct ‘Condition Survey’– Determining rehabilitability i/c part demolition
– Whether building to be got vacated for repairs?
– Detailed damage assessment and determining residual strength.
– Details of temporary support arrangement to avoid further distress under normal loads
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Repairs, Rehabilitation and Retrofitting
• In New Building, the extra Cost of SeismicResistant features is nominal (i.e. 2% to 5% ofstructure’s cost)
• In Existing Building, the seismic retrofitting iscostlier (i.e. 5 to 15% of structure’s cost)
• Structural Repairs of Corrosion distressedstructures are also costlier
• Replacement of structure is still more costly• A Balanced View is required to be taken before
deciding upon the various options
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Repair & retrofitting Vs Reconstruction
• As a thumb rule, repair/ strengthening is resorted, if its overall cost is less than 30% of the cost of reconstruction
• Replacement/reconstruction is, generally avoided due to
– Preservation of Historical Architecture
– Maintaining functional social and cultural environment
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Classification of Repair Materials
• Based on its Application
– Surface Preparation
– Rust Removers / Converters
– Passivators for Reinforcement Protection
– Bonding Agents
– Structural Repair Materials
– Injection Grouts
– Joint Sealants
– Protective Surface Coatings
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Cement Concrete/Mortar as
Repair Material
• Cement Concretes/Mortars are the natural Repair Materials for RCC structures but not favoured due to inherent undesirable properties like:
– Drying shrinkage
– Slow Setting
– Low Workability
– Prolonged Curing requirements
– Permeability
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Repair Sequence for Corrosion Damaged & Spalled cover Concrete
1. Surface Preparation
• Loose and carbonated concrete removal all-around reinforcement
2. Fix Shear Connectors, if required
3. Apply bonding layer over Substrate concrete
4. Apply Passivating Coat over Steel Reinforcement
5. Apply repair – Cement based repairs or
– Resin based repairs, or
– Sprayed concrete (shotcrete)
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Jacketing of RCC Column
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REHABILITATION AND SEISMIC RETROFITTING
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EARTHQUAKES
• EARTHQUAKES DO NOT KILL BUT IT IS THE BUILDINGS WHICH KILL
• NEARLY 5,00,000 EARTHQUAKES OCCUR EVERY YEAR
• ABOUT 1,00,000 ARE FELT
• Minor earthquakes occur nearly constantly around the world in places like California and Alaska in the U.S., as well as in Mexico, Guatemala, Chile, Peru, Indonesia, Iran, China, Pakistan, Portugal, Turkey, New Zealand, Greece, Italy, India and Japan, but earthquakes can occur almost anywhere.
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CASUALTIES
• LARGE NUMBER OF CASUALTIES OCCUR IN DEVEOPING COUNTRIES. REASONS MAY BE;– INADEQUATE DESIGN
– POOR CONSTRUCTION AND MAINTENANCE
– LACK OF RESOURCES
– INADEQUATE KNOWLEDGE
– INADEQUATE AWARENESS
– INADEQUATE TRAINING
– INADEQUATE SAFETY IMPLEMENTATION
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CAUSES OF FAILURE OF MASONRY BUILDINGS
POOR QUALITY OF MORTAR
IRREGULARITY IN PLANE AND VERTICAL DIRECTION
NO PROVISION OF BANDS
NO THOROUGH STONES
HEAVY MASS CONCENTRATION AT ROOF LEVEL
UNSYMMETRICAL BUILDINGS AND FULL OPENINGS
UNCONFINED WALL CORNERS
INADEQUATELY DESIGNED CANTILEVER ELEMENTS
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CAUSES OF FAILURE OF RCC BUILDINGS
• SOFT STOREY (ONE IN WHICH LATERAL STIFFNESS IS LESS THAN 70% OF THAT IN THE STOREY IMMEDIATELY ABOVE OR LESS THAN 80% OF THE COMBINED STIFFNESS OF THREE STOREYS ABOVE)
• POOR DETAILING OF BEAM COLUMN JUNCTIONS• PROVISION OF FLOATING COLUMNS• PLAN AND MASS IRREGULARITY• INADEQUATE FOUNDATION• POUNDING OF BUILDINGS• INADEQUATE DESIGN AND DETAILING• INADEQUATE CONNECTVITY LIKE ISOLATED STAIRCASES
AND WATER TANKS NOT PROPERLY ANCHORED
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NORMALLY STRUCTURES REQUIRINGREPAIR AND REHABILITATION AREMORE SUSCEPTIBLE TO DAMAGE,HENCE REPAIR AND REHABILITATIONIS VERY IMPORTANT
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CAUSES OF DETERIORATION OF RCC
• PENETRATION OF WATER/CHEMICALS LEADING TO CARBONATION, CHLORIDE INGRESS, LEACHING, SULPHATE ATTACK, ALKALI SILICA REACTION ETC LEADING TO
CORROSION IN THE REINFORCEMENT
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MAIN REASON OF PENETRATION OF WATER
• POROSITY OF CONCRETE
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PRECAUTIONS TAKEN TO PREVENT POROSITY
• ADEQUATE STRENGTH OF CONCRETE
• PROPER COMPACTION
• WATER PROOFING ON ROOF
• PLASTER ON CONCRETE
• WATER PROOFING PAINTS ON EXPOSED PLASTERED SURFACE
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CAUSES OF DETERIORATION OF CONCRETE
• AGING OF STRUCTURE
• POOR QUALITY
– POOR QUALITY OF TESTING/INVESTIGATION
– POOR QUALITY OF DESIGN
– POOR QUALITY OF EXECUTION IN TERMS OF MATERIALS/COMPACTION/PAINTS/COVER/RCC
– POOR QUALITY OF MAINTENANCE
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SELECTION OF MATERIALS FOR REHABILITATION/ RETROFITTING
• TECHNICAL REQUIREMENTS
• COST
• AVAILABILITY
• EXPERT’S ADVICE
• IMPORTANCE OF THE STRUCTURE
• BALANCE LIFE OF THE STRUCTURE
• TOXICITY OF THE MATERIAL
• AESTHETIC CONSIDERATION
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REHABILITATION METHODS
• SAND BLASTING FOR REMOVAL OF CORROSION AND APPLYING A COAT TO RETARD CORROSION
• BINDING/ADDING OF ADDITIONAL REINFORCEMENT/CONCRETE
• WELDING• ANCHORING TO THE EXISTING MEMBERS THROUGH
SHEAR KEYS OR ANCHORS• SHOTCRETING• PLATE BONDING• JACKETING• FIBRE WRAPPING
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PROCEDURE
• REMOVAL OF LOOSE MATERIALS/RUST
• PROVIDING PROTECTIVE LAYER/COATING
• PROVIDING BONDING COAT BETWEEN OLD AND NEW MATERIAL/SURFACES
• PROVIDING STEEL MEMBERS/WELDING/ANCHORS/ SHEAR KEYS TO ENSURE MONOLITHIC ACTION
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RETROFITTING IN RCC COLUMNS/BEAMS/SLABS
• PLATE BONDING
• FIBRE WRAP TECHNIQUES THROUGH GLASS FIBRES/CARBON FIBRES
• RCC JACKETING
• NEW CASTING
• GUNITING/SHOTCRETING
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RCC Jacketing
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Carbon Fibre Wrapping
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Carbon Fibre Wrapping
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Glass Fibre Reinforcement Wrapping
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MS Plate Wrapping
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MASONRY STRUCTURES
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VULNERABILITY
• BRICK/STONE MASONRY STRUCTURES ARE MORE VULNERABLE AND THEN POORLY CONSTRUCTED/REPAIRED?
• DISASTER= VULNERABILITY X HAZARD
• BRICK STRUCTURES ARE MORE IN THE COUNTRY
• SO WE NEED SAFE BRICK MASONRY STRUCTURES
• IF NOT, WE NEED TO MAKE THEM SAFE BY RETROFITTING.
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SEISMIC STRENGTHENING/ RETROFITTING
THE TECHNIQUE TO UPGRADE THE STRUCTUREFOR EARTHQUAKE RESISTANCE TO THE LEVELOF PRESENT DAY CODAL REQUIREMENTSHAVING ORIGINAL STRUCTURAL INADEQUACYOR INADEQUACY DUE TO MATERIALDEGRADATION OVER TIME OR DUE TOALTERATIONS CARRIED OUT DURING ITS USEOVER THE YEARS
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SEISMIC STRENGTHENING
MAIN PURPOSE OF SEISMIC STRENGTHEING ISTO UPGRADE/PROVIDE THE SEISMICRESISTANCE ON A BUILDING SO THAT ITBECOMES SAFER UNDER EARTHQUAKEOCCURANCES
AVOIDING THE POSSIBILITY OF BRITTLE MODESOF FAILURE BY PROPER REINFORCEMENT ANDCONNECTION OF RESISTING MEMBERS
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IS CODES
CODES
◦ IS 13935 (JUNE 2009) – GUIDELINES FOR REPAIR,RESTORATION, CONDITION ASSESSMENT ANDSEISMIC STRENGTHEING OF MASONRY BUILDINGS
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GENERAL PROVISIONS REQUIRED IN MASONRY BUILDINGS
PLINTH BAND
LINTEL BAND
ROOF SLAB/ROOF BAND
CORNER REINFORCEMENT
BRICK WORK IN CEMENT MORTAR OF 1:6
RESTRICTED OPENINGS
ADEQUATE FOUNDATION
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SELECTION OF MATERIALS AND TECHNIQUES FOR RETROFITTING
CEMENT
STEEL ◦ BOLTS, RODS, ANGLES, BEAMS, CHANNELS,
EXPANDED METAL, WELDED WIRE FABRIC
ADMIXTURES TO IMPROVE NON-SHRINKAGE(GROUTS CONSISING POLYMER, NON-SHRINKCEMENT AND SPECIAL SANDS), BOND (EPOXYRESINS) ETC.
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114
114
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SEQUENCE OF RETROFITTING
REPAIR/REHABILITATION
ALL CRACKS SHOULD BE FULLY REPAIRED
◦ PRESSURE INJECTION OF NON-SHRINK CEMENTPOLYMER GROUT FOR 0.5 TO 5 MM CRACKS
◦ REPAIR BY EXPANSIVE CEMENT MORTAR, QUICKSETTING CEMENT, ADDL. SHEAR OR FLEXURALREINFORCEMENT, STEEL MESH, STEEL RODS
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REPAIR/STRENGTHENING OF WALLS
BY GROUTING (CEMENT WATER MIXTURE ORPOLYMERIC MORTAR)
BY ADDITION OF VERTICAL REINFORCEMENTCONCRETE COVERINGS ON THE TWO SIDES OF THEWALL
BY PRESTRESSING WALL
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HORIZONTAL SEISMIC BELTS
TO BE PROVIDED ◦ ON ALL WALLS
◦ ON BOTH THE FACES
◦ JUST ABOVE THE LINTEL
◦ BELOW ROOF
◦ BELOW FLOOR
◦ IN CASE OF RCC SLAB ROOF BELT NOT REQUIRED
◦ NOT REQUIRED AT PLINTH LEVEL UNLESS PLINTH HEIGHT IS MORE THAN 900 MM
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ON ALL WALLSON BOTH THE FACESABOVE LINTEL
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SEISMIC BELTS AROUND DOOR/WINDOW OPENINGS
IN CATEGORY “D” AND “E” BUILDINGS
MESH OF GAUGE 10 WITH 8 WIRES IN VERTICALDIRECTION SPACED AT 25 MM IN A BELT WIDTH OF200MM OR
GAUGE 13 WITH 10 WIRES IN VERTICAL DIRECTIONSPACED AT 25 MM IN A BELT WIDTH OF 250MM (INCAT. C BUILDINGS ALSO)
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AROUND OPENINGS
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VERTICAL SEISMIC BELTS AT CORNERS
AT THE CORNERS OF ROOMS
JUNCTIONS OF THE WALLS
WIDTH ON EACH SIDE OF THE CORNERTO BE KEPT 25 MM EXTRA TO THEWIDTH OF THE MESH
REIFORCEMENT TO BE STARTED BELOW300 MM BELOW PLINTH LEVEL
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AT EXTERNAL CORNERS
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VERTICAL REINFORCEMENT AT INSIDE CORNER
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ROOFS CONSISTING OF STEEL JOISTS FLAT OR SEGMENTAL ARCHES MUST HAVE HORIZONTAL TIES HOLDING THE JOISTS HORIZONTALLY IN EACH ARCH SPAN SO AS TO PREVENT SPREADING OF JOISTS
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ANCHORS
MECHANICAL ANCHORS
CHEMICAL ANCHORS
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PROCEDURE OF ANCHORING
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SPECIFICATIONS FOR HORIZONTAL SEISMIC BELT
SPEC. FOR VERITICAL REINFORCEMENT
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Additional steps
• Repair and rehabilitation to be carried out prior to retrofitting.
• At the external corners, on each face of the wall, the width of the mesh for corner reinforcement may be kept as minimum 250 mm on each wall so that it covers minimum one brick.
• The mesh reinforcement at the corners may be kept minimum 300 mm below ground level
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Contd.
• Mesh reinforcement used should be galvanized steeland anti rusting paint should be applied on the cutpoints to prevent corrosion.
• MS washers used on wire mesh should be paintedwith anti corrosive paint. In the present case, M.S.washers of size 50X50X5 mm were used to anchor themesh reinforcement.
• Since it was not possible to provide roof belt of meshof required width in central portion due to segmentalarch construction and ventilators provided near thetop portion, MS flat belt was provided.
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•The anchors are to be inserted into thehole after the grout is inserted within geltime, which is given 4 minutes fortemperature of 30 degree Celsius and 6minutes for 20 degree Celsius for theanchors and chemical grout used from HiltiIndia Private Limited.
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•In the inside corner reinforcement,a prefabricated MS piece was usedhaving two holes, one used forinserting into the bar which can beadjusted at any position and otherend used for inserting anchor.Chemical anchoring was done
thereafter.Anchoring on wire mesh should bein staggered (zig-zag) manner.
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151
TRAINING, SKILL UPGRADATION AND COMPETENCE DEVELOPMENT
• STAKEHOLDERS
– POLICY MAKERS
– TRAINERS
– PARTICIPANTS
– IMPLEMENTERS
POLICY MAKERS
TRAINERS
PARTICIPANTS
IMPLEMENTERS
151
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Item 1
• Providing and fixing 250 mm wide or required size seismic belt for retrofitting with 12 gauge (2.64 mm dia) galvanized iron welded mesh with 25 mm spacing of wire on walls at required height (inside and out side the building ) fixed in position with headed nails at required distance complete as per direction of Engineer-in-charge. (Cut end of wire mesh to be painted with NitoZinc Primer)
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Item 2
• Providing and fixing stainless steel anchors of 8 mm dia(HAS-EM8 x 80 / 14) of HILTI or equivalent on GI wire mesh at required distance in staggered position i/cdrilling of 10 mm dia hole with HILTI hammer drill machine TE-6S or equivalent and cleaning of hole by brush and blow out pump. Anchors shall be fixed by resin and hardener pack of HILTI make HY-150/330/2R or equivalent (35 holes per tube of 330 ml) chemical. Mesh will be fixed with MS washer of size 50x50x5 mm painted with NitoZinc primer (FOSROC) on top of the mesh with anchor screwed with nut complete as per direction of Engineer- in- charge.
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Item 3
• Painting on galvanized iron / steel work such as M.S. angle, flat, cold twisted bars with Protective / Bond coats i.e NitoZinc (FOSROC) primer of approved brand and manufacture as per direction of Engineer-in-charge.(Surface area of steel work shall be measured for payment)
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Item 4
• Providing and Fixing steel reinforcement bar 10 mm dia for seismic strengthening of building at inside corner i/c fixing with M.S. cleat 50x50x6 mm size having 2 holes. The reinforcement bar shall pass through one hole and other hole shall be used for anchoring into brick / CC wall.
(The payment for steel reinforcement, Anchor & grouting at floor and roof shall be paid for separately)
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Item 5
• Providing and fixing seismic band for seismic strengthening of size 50x5 mm flat iron section at required level including making necessary holes not more than 75 cm apart and keeping in position with nails and finally fixing with Anchors ( Payments for Anchors & its fixing shall be made separately).
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Item 6
• 28 mm thick Acrylic modified cement mortar/micro concrete band at required level with mix 1:1:2 (1 cement : 1 coarse sand : 2 graded stone aggregate 6 mm & down nominal size) in two coats admixed with polymer modified compound (Armourcrete / Tapecrete) @ 10% of cement (by weight) used area and including slurry coat of Acrylic cement @ 2.2 kg / sqm mixed with polymer modified compound (Armourcrete/ Tapecrete) @ 10% of cement used and finished smooth complete (top layer will be of 12 mm plaster).
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1584th July 2017 Disaster management
Photos and References have been taken from various web sites.Their contribution is gratefully acknowledged)