1 -safety of buildingd-bobin moahnty
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Transcript of 1 -safety of buildingd-bobin moahnty
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BE BE AWAREAWARE
OFOFEARTHQUAKE !EARTHQUAKE !
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Shaking is dangerous Shaking is dangerous ………………
If Shilpa Shetty shakes, If Shilpa Shetty shakes, many hearts fail.many hearts fail.If ground shakes, If ground shakes,
many buildings fail.many buildings fail.
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Damages Damages due todue to
EARTHQUAKEEARTHQUAKE
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Earthquake Earthquake not only not only
damages buildings damages buildings but also but also
takes lives.takes lives.
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Why not we take Why not we take precaution to precaution to
save our lives ?save our lives ?
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SAFETY PRECAUTION SAFETY PRECAUTION OF BUILDINGS OF BUILDINGS
IN IN SEISMIC ZONESSEISMIC ZONES
WelcomeWelcometoto
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TOTAL ZONES:4 TOTAL ZONES:4 (ZONE- II, III, IV &V)(ZONE- II, III, IV &V)
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comes undercomes under
2 seismic zones 2 seismic zones
i.e. Zone – II & IIIi.e. Zone – II & III
EAST COAST EAST COAST RAILWAYRAILWAY
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• FRAMED &FRAMED &
• BOX TYPEBOX TYPE
(popularly known as Load Bearing (popularly known as Load Bearing Masonry)Masonry)
TYPE OF BUILDING TYPE OF BUILDING CONSTRUCTIONCONSTRUCTION
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BIS CODES TO BE BIS CODES TO BE FOLLOWED FOR FOLLOWED FOR
SEISMIC RESISTANCESEISMIC RESISTANCE
• IS 1893( PART-1)-2002IS 1893( PART-1)-2002(FOR ALL CONSTRUCTIONS)(FOR ALL CONSTRUCTIONS)
• IS 13920-1993IS 13920-1993(FOR FRAMED CONSTRUCTION)(FOR FRAMED CONSTRUCTION)
• IS 4326-1993IS 4326-1993(FOR BRICK MASONRY CONSTRUCTION)(FOR BRICK MASONRY CONSTRUCTION)
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BRIEF ON BRIEF ON FRAMED FRAMED
CONSTRUCTIONCONSTRUCTION
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BAR BENDING BAR BENDING TO BE CHECKED AT SITETO BE CHECKED AT SITE (AT COLUMN-BEAM JUNCTION)(AT COLUMN-BEAM JUNCTION)
Ld + 10 dia of bar
WRONG CORRECT
REINFORCEMENT
COLUMN
BEAM
REINFORCEMENT
COLUMN
BEAM
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(LATERAL TIES & (LATERAL TIES & SHEAR REINFORCEMENT)SHEAR REINFORCEMENT)
WRONG CORRECT
450
10 x dia of bar
450
• IMPORTANT NOTE FOR LAPPING OF BARSIMPORTANT NOTE FOR LAPPING OF BARSLAPPING OF BAR SHOULD NOT BE PROVIDED LAPPING OF BAR SHOULD NOT BE PROVIDED INBETWEEN QUARTER LENGTH OF MEMBER FROM INBETWEEN QUARTER LENGTH OF MEMBER FROM JOINT & IT SHOULD BE STAGGERED.JOINT & IT SHOULD BE STAGGERED.
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FOCUSFOCUSONON
LOAD LOAD BEARING BEARING
CONSTRUCTIOCONSTRUCTIONN
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BUILDING BUILDING CATEGORIESCATEGORIES
Depends on IMPORTANCE FACTOR “Depends on IMPORTANCE FACTOR “II””• HOSPITALS, SCHOOLS,MONUMENTAL HOSPITALS, SCHOOLS,MONUMENTAL
STRUCTURES, TELEPHONE EXCHAGES, STRUCTURES, TELEPHONE EXCHAGES, LARGE COMMUNITY BUILDINGS, STATION LARGE COMMUNITY BUILDINGS, STATION BUILDINGS, etc. : BUILDINGS, etc. : II =1.5 =1.5
• OTHER BUILDINGS : OTHER BUILDINGS : II =1.0 =1.0
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BUILDING CATEGORIESBUILDING CATEGORIES(ZONEWISE)(ZONEWISE)
I Zone-II Zone-III
1.0 B C
1.5 C D
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HEIGHTHEIGHT OF OF
BUILDINGBUILDING• MAXIMUM HEIGHT = 15.00 m MAXIMUM HEIGHT = 15.00 m
(from mean ground level to top of roof slab)(from mean ground level to top of roof slab)
• MAXIMUM STOREY = 4 STOREYSMAXIMUM STOREY = 4 STOREYS
ZONE-IIZONE-II
4 storeys for all categories4 storeys for all categories
ZONE-IIIZONE-III
preferably 2 storeys for important categories & preferably 2 storeys for important categories &
4 storeys for other categories4 storeys for other categories
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MORTAR MIXMORTAR MIX (MINIMUM)(MINIMUM)
Category cement : sand
B & C 1 : 6
D 1 : 4
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CONCRETE GRADECONCRETE GRADE (MINIMUM)(MINIMUM)
• FOR RCC WORK : M20 FOR RCC WORK : M20 (as per IS (as per IS 456:2000)456:2000)
(1 cement:1.5 sand:3 (1 cement:1.5 sand:3 aggregates)aggregates)
• FOR MCC WORK : M15 FOR MCC WORK : M15 (as per IS (as per IS 456:2000)456:2000)
(1 cement:2 sand:4 (1 cement:2 sand:4 aggregates)aggregates)
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BRICKSBRICKS
• The crushing strength should not be The crushing strength should not be less than 35 Mpa (N/mmless than 35 Mpa (N/mm22))
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SEISMIC SEISMIC STRENGTHENING STRENGTHENING ARRANGEMENTSARRANGEMENTS
• BANDS (a, b & c)BANDS (a, b & c)
• VERTICAL STEEL AT VERTICAL STEEL AT CORNERS & JUNCTION CORNERS & JUNCTION OF WALLS (d)OF WALLS (d)
• VERTICAL STEEL AT VERTICAL STEEL AT JAMBS OF WINDOW (e)JAMBS OF WINDOW (e)PLINTH BAND (a)
LINTEL BAND (b)
ROOF BAND (c)
P.L.
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REQUIREMENTSREQUIREMENTS
CATEGORYNO OF STOREYS
PROVISION
B1 to 3 a,b,c
4 a,b,c,d
C1 & 2 a,b,c
3 & 4 a,b,c,d,e
D1 & 2 a,b,c,d,e
3 & 4 a,b,c,d,e & DOWEL BARS
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NOTESNOTES
• PLINTH BAND (a) : It is to be provided PLINTH BAND (a) : It is to be provided where strip footings of masonry (other where strip footings of masonry (other than RCC) are used and soil is either than RCC) are used and soil is either soft or uneven in its properties as soft or uneven in its properties as frequently happens in hilly areas. frequently happens in hilly areas.
The top of all lintels (over openings & The top of all lintels (over openings & walls) should be at one level. walls) should be at one level.
BANDSBANDS
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• Two bars in lintel band (over Two bars in lintel band (over
walls):walls): • Minimum thickness was 75 mm for two Minimum thickness was 75 mm for two bars. However, it will be more based on bars. However, it will be more based on exposure condition as per IS 456 : 2000.exposure condition as per IS 456 : 2000.
• Mild Exposure condition: thickness = 75 Mild Exposure condition: thickness = 75 mm (clear cover = 33 mm)mm (clear cover = 33 mm)
• Moderate Exposure condition: thickness Moderate Exposure condition: thickness = 90 mm (clear cover = 38 mm)= 90 mm (clear cover = 38 mm)
• Severe Exposure condition: thickness = Severe Exposure condition: thickness = 115 mm (clear cover = 53 mm)115 mm (clear cover = 53 mm)
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•Four bars in lintel band (very Four bars in lintel band (very common):common):• Minimum thickness was 150 mm for four Minimum thickness was 150 mm for four
bars. However, it will be more based on bars. However, it will be more based on exposure condition as per IS 456 : 2000.exposure condition as per IS 456 : 2000.
• Mild Exposure condition, thickness = 150 Mild Exposure condition, thickness = 150 mm (clear cover = 33 mm)mm (clear cover = 33 mm)
• Moderate Exposure condition, thickness Moderate Exposure condition, thickness = 150 mm (clear cover = 38 mm)= 150 mm (clear cover = 38 mm)
• Severe Exposure condition, thickness = Severe Exposure condition, thickness = 175 mm (clear cover = 53 mm)175 mm (clear cover = 53 mm)
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ARRANGEMENT OF BARS IN ANY ARRANGEMENT OF BARS IN ANY BANDBAND
• FOR DETAILS OF BARS, REFER TABLE-6 OF IS 4326FOR DETAILS OF BARS, REFER TABLE-6 OF IS 4326• FOR ROOM SIZE GREATER THAN 8.OO m, IT IS DESIRED FOR ROOM SIZE GREATER THAN 8.OO m, IT IS DESIRED
TO INSERT PILLASTERS/BUTTRESSES TO REDUCE THE TO INSERT PILLASTERS/BUTTRESSES TO REDUCE THE LENGTHLENGTH
THICKNESS
TWO BARS
FOUR BARS
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SIZE & POSITION SIZE & POSITION OF OPENINGS IN WALLSOF OPENINGS IN WALLS
X = Distance from the inside corner of outside wall X = Distance from the inside corner of outside wall For B category, x = zeroFor B category, x = zero
C category, x = 230 mmC category, x = 230 mm D category, x = 450 mm D category, x = 450 mm
For other details, refer Table – 4 of IS 4326For other details, refer Table – 4 of IS 4326• If openings do not comply with above, they should be If openings do not comply with above, they should be
strengthened by providing reinforced concrete as shown in next strengthened by providing reinforced concrete as shown in next page.page.
x
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ARRANGEMENTARRANGEMENT
OPENINGREINFORCED CONCRETE
WALL
LINTEL BAND
WALL
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FOR FURTHER SAFETY FOR FURTHER SAFETY STANDARDS IN STANDARDS IN
BUILDINGSBUILDINGSREFERREFER
IS 4326 : 1993IS 4326 : 1993
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HAVE HAVE A BEAUTIFUL A BEAUTIFUL
& & SAFESAFE
BUILDINGBUILDING
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EAST COAST RAILWAYEAST COAST RAILWAY
ENGINEERS ASSOCIATIONENGINEERS ASSOCIATION BHUBANESWARBHUBANESWAR
(Affiliated with ALL INDIA RAILWAY ENGINEERS (Affiliated with ALL INDIA RAILWAY ENGINEERS FEDERATION) (AIREF)FEDERATION) (AIREF)
CourtesyCourtesy
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TTHHAANNQ Q UU AALLLL