IS 456: Plain and Reinforced Concrete - Code of Practice

114 Pages·2000·7.1 MB·English

by  Bureau of Indian Standards

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IS 456 (2000): Plain and Reinforced Concrete - Code of
Practice [CED 2: Cement and Concrete]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS.456 :2000
(R••fflrmed2005)

Indian Standard
PLAIN AND REINFORCED CONCRETE
CODE OF PRACTICE
( Fourth Revision)
Tenth Reprint APRIL2007
(IncludingAmendmentsNo.Iand2)
ICS 91.100.30
C BI52000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN. 9 B AHADUR SHAH ZAFAR MARG
NEW DELIiI 110002
July 2000 Price Rs. 830.09+Rs. 120.09
IS456:2000
CONTENTS
PAGE
SECTION 1 GENERAL
J SCOPE )J
2 REFERBNCES 11
3 TERMINOLOGY 11
4 SVMBOU 11
SECTION2 MATERIALS,WORKMANSHIP, INSPECTIONANDTESTING
5 MATERIALS 13
5.1 Cement 13
5.2 MineralAdmixtures 13
5.3 Aggregates 14
5.4 Water 14
5.5 Admixtures IS
5.6 Reinforcement 15
5.7 StorageofMaterials 15
6 CONCRETE 15
6.1 Grades 15
6.2 PropertiesofConcrete 15
7 WORKABIUTYOFCONCRETE 17
8 DURABILITYOFCONCRETE 17
8.1 General 17
8.2 RequirementsforDurability 18
9 CONCRETEMIX PROPORTIONING 22
9.1 MixProportion 22
9.2 Design MixConcrete 22
9.3 NominalMixConcrete 23
10 PRODUlllON OFCONCRETE 23
10.1 QualityAssuranceMeasures 23
10.2 Batching 24
10.3 Mixing 24
11 FORMWORK 25
1J.1 General 25
11.2 CleaningandTreatmentofFonnwork 25
11.3 StrippingTime 25
12 ASSEMBLYOFREINFORCEMENT 25
·13 TRANSPORTING, PLACING,COMPACTION ANDCURING 26
J3.1 TransportingandHandling 26
13.2 Placing 26
13.3 Compaction 26

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13.4 ConstructionJointsandColdJoints 27
13.5 Curing 27
13.6 Supervision 27
14 CONCRETINGUNDERSPECIALCosornoss 27
14.1 WorkinExtremeWeatherConditions 27
14.2 Under-WaterConcreting 27
15 SAMPLINGANDSTRENGTHOFDESIGNED CONCRETEMIX 29
15.1 General 29
15.2 FrequencyofSampling 29
IS.3 TestSpecimen 29
15.4 TestResultsofSample 29
16 ACCEPTANCECRITERIA 29
17 INS"EcrlONANDTESTINGOFSTRUCTURE 30
SECTION 3 GENERALDESIGN CONSIDERATION
18 BASESRlR DESIGN 32
18.1 AimofDesign 32
18.2 MethodsofDesign 32
18.3 Durability,WorkmanshipandMaterials 32
18.4 DesignProcess 32
19 LOADSANDFORCES 32
t9.1 General 32
19.2 DeadLoads 32
19.3 ImposedLoads,WindLoadsandSnowLoads 32
19.4 EarthquakeForces 32
19.5 Shrinkage,CreepandTemperatureEffects 32
19.6 OtherForcesandEffects 33
J9.7 CombinationofLoads 33
19.8 DeadLoadCounteractingOtherLoads andForces 33
19.9 DesignLoad 33
20 STABILITYOFTHESTRUC1lJRE 33
20.1 Overturning 33
20.2 Sliding 33
20.3 ProbableVariationinDeadLoad 33
20.4 MomentConnection 33
20.5 LateralSway 33
21 FIREREsiSTANCE 33
22 ANALYSIS 34
22.1 General 34
22.2 EffectiveSpan 34

22.3 Stiffness 3.5
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22.4 StructuralFrames 35
22.5 Momentand ShearCoefficientsforContinuous Beams 35
22.6 Critical Sectionsfor Momentand Shear 36
22.7 Redistribution ofMoments 36
23 BEAMS 36
23.0 EffectiveDepth 36
23.1 T-Beams and L-Beams 36
23.2 Control ofDeflection 37
23.3 SlendernessLimits for Beamsto EnsureLateral Stability 39
24 SOLID SLABS 39
24.1 General 39
24.2 SlabsContinuousOverSupports 39
24.3 SlabsMonolithic with Supports 39
24.4 SlabsSpanning inTwo Directionsat RightAngles 41
24.5 Loadson Supporting Beams 41
25 COMPRESSION MEMBERS 41
25.1 Definitions 41
25.2 Effective LengthofCompression Members 42
25.3 SlendernessLimits for Columns 42
25.4 MinimumEccentricity 42
26 REQUIREMENTS QOVERNINGREINFORCEMENT AND DETAILING 42
26.I General 42
26.2 DevelopmentofStressinReinforcement 42
26.3 SpacingofReinforcement 45
26.4 NominalCovertoReinforcement 46
26.5 Requirements ofReinforcement for Structural Members 46
27 EXPANSIONJOINTS 50
SECTION 4 SPECIAL DESIGN REQUIREMENTS FOR
STRUCTURALMEMBERSAND SYSTEMS
28 CONCRETECORBELS 51
28.1 General 51
28.2 Design 51
29 DEEPBEAMS 51
29.1 General 51
29.2 LeverArm SI
29.3 Reinforcement 51
30 RIBBED, HOLU)W BLOCKORVOlDEnSLAB 52
30.1 General 52
30.2 AnalysisofStructure 52
30.3 Shear 52
30.4 Deflection 52
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30.5 Sizeand PositionofRibs S2
30.6 HollowBlocksandFormers 52
30.7 ArrangementofReinforcement 53
30.8 PrecastJoistsand HollowFillerBlocks 53
31 FLATSLABS .53
31.1 General 53
31.2 Proportioning S3
31.3 DetenninationofBendin. Moment S3
31.4 Direct DesipMethod 54
31.5 EquivalentFnmeMethod 5'6
31.6 ShearinFlatSlab S1
31.7 SlabReinforcement .59
31.8 OpeningsinFlatSlabs 61
32 WAUS 61
32.1 General 61
32.2 EmpiricalDesignMethodforWall~SubjectedtoInplaneVerticalLoads 61
32.3 WallsSubjectedtoCombinedHorizontalandVerticalForces 62
32.4 DesignforHorizontalShear 62
32.S MinimumRequirementsforReinforcementinWalls 62
33 STAIRS 63
33.1 EffectiveSpanofStairs 63
33.2 DistributionofLoadingonStairs 63
33.3 DepthofSection 63
34 FOOT1NOS 63
34.J General 63
34.2 MomentsandForces 64
34.3 TensileReinforcement 65
34.4 TransferofLoadattheBaseofColumn 6S
34.5 NominalReinforcement 66
SECTION 5 STRUCTURALDESIGN (LIMITSTATEMETHOD)
3S SAFETYANDSERVICEAlIUI'YRsoUIREMBNTS 67
3S.1 General 67
35.2 LimitStateofCollapse 67
35.3 LimitStatesofServiceability 67
3S.4 OtherLimitStates 67
36 CHARACTBRISTICANDDEsIGNVALtmsANDPAR11ALSAFETYFACIORS 67
36.1 Ch8rIcteristicStrenathofMaterials 67
36.2 CharacteristicLoads 67 .
36.3 DesipValues 68
36.4 PartialSafetyFactors 68
37 ANALYSIS 68
37.1 AnalysisofStructure 68
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38 LIMITSTATBOPCOLLAPSE:FLEXURE 69
38.1 A.lumptions 69
39 LIMITSTATBOFCOUAPSS:COMPRESSION 70
39.1 Assumptions 70
39.2 MinimumEccentricity 71
39.3 ShortAxiallyLoadedMembersinCompression 71
39.4 CompressionMemberswithHelicalReinforcement 71
39.5 Memben SubjectedtoCombinedAxialLoadandU~iaxialBendins 71
39.6 MembenSubjectedtoCombinedAxialLoadandBiaxialBending 71
39.7 SlenderCompressionMembers 71
40 LlMrrSTATSOPCOLLAPSE:SHEAR 72
40.1 Nominal Shear Stress 72
40.2 DesianShearStrensthofConcrete 12
40.3 MinimumShearReinforcement 72
40.4 DesiSDofShearReinforcement 72
4O.S BnhancedShearStrengthofSectionsClosetoSupports 74
41 LIMrrSTATEOPCOLLAPSB:TORSION 74
41.1 General 74
41.2 Critical Section 7S
41.3 Shear andTorsion 75
41.4 ReinforcementinMembersSubjectedtoTorsion 75
42 LIMITSTATEOFSBRVlCEABD.nY:DEFLECTION 75
42.1 FlexuralMembers 75
43 LIMITSTATEOFSERVICEABILITY'CRACKING 16
43.1 FlexuralMembers 76
43.2 Compre~ionMembers 76
ANNEXA LIST OFREFERREDINDIANSTANDARDS 71
ANNEXB STRUCTURALDESIGN(WORKINGSTRESSMETHOD) 80
B-1 GENERAL 80
B-1.1 General Design Requirements 80
B-l.2 RedistributionofMoments 80
B-l.3 AssumptionsforDesignofMembers 80
B-2 PBRMIsslBLBSTRESSBS 80
8-2.1 PermissibleStresses inConcrete 80
8-2.2 PermissibleStresses inSteelReinforcement 80
B-2.3 Increase inPermissible Stresses 80
B-3 PBRMIssIBLELoADSINCOMPRBSSIONMEMBERS 81
B-3.1 Pedestals andSbortColumns withLateral Ties 81
8-3.2 ShonColumnswithHelicalReinforcement 81
B-3.3 Lon.Columns 81
8-3.4 CompositeColumns "\r. 81

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B-4 MEMBBRSSUlJBCTIDTOCOMBINEDAxIALloADANDBINDING 83
8-4.1 De,iIDBaedonUncrackedSection 83
B-4.2 DelilftBaedonCrackedSection 83
B-4.3 MembersSubjectedtoCombinedDirectLoad andFlexure 83
D-S SHEAR 83
B-S,1 Nominal ShearStress . 83
B-5,2 neaipShearStrenlthofConcrete 84
B-S.3 MinimumShearReinforcement 8S
B-5.4 DesilnofShearReinforcement 85
B·'.' EnhancedShearStrengthofSectionsClosetoSupports 8S
B-6 TORSION 86
B-6.1 General 86
B-6.2 CriticalSection 86
B-6.3 ShearandTorsion 86
B-6.4 ReinforcementinMembersSubjectedto Torsion 86
ANNEXC CALCULATIONOFDEFLECTION 88
e-l TOTALD8PLIIcnON 88
C-2 SHOIlT-TBIMDBPLICTION 88
C-3 DBPLECI10NDuETOSHRINKAGE 88
C-4 DIFLECI10NDUETOCREEP 89
ANNEXD SLABSSPANNINGINTWODIRECTIONS 90
0·1 IUmtAINIDSLAM 90
D-2 SIM,tySuppotnSSUBS 90
ANNEXB SPPRCTIVI LaNOTHOFCOLUMNS 92
ANNEXF CALCULAnONOFCRACKWID1lI 95
ANNEXG MOM!NTSOPltBSlSTANCBFORRECTANGULARANDT-SECI10NS 96
G-l RscrANOULARSBC110NS 96
0-1.1 SectionswithoutComprealionReinforcement 96
0-1.2 SectionswithCompressionReinforcement 96
0-2 FLANOEDSEC110N 96
ANNEXH COMMITTEECOMPOSITION 98

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