IS 1893-1 (2002): Criteria for Earthquake Resistant Design ...

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2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 1893-1 (2002): Criteria for Earthquake Resistant Designof Structures, Part 1: general provisions and Buildings[CED 39: Earthquake Engineering]June2002 ..IS1893(Part1):2002 IndianStandardCRITERIAFOREARTHQUAKERESIS TANTDESIGNOFSTRUCTURESPART1 GENERALPROVISIONSANDBUILDINGS(FfthRevisi on) ,9 BAHADURSHAHZAFARMARGNEWDELHI110002 PriceGroup12 Recommendationsforearthquakeresistantdes ignofstructures ,thesectionalcommitteefelttheneedtorevis ethestandardagainincorporatingmanychange s,suchasrevisionofmapsshowingseismiczone sandepicentres, ,considerableamountofsuggestionswererece ivedformodifyingsomeoftheprovisionsofthe standardand,therefore, :a)b)c)d)e)8 Thestandardincorporatedseismiczonefactor s(previouslygivenasmultiplyingfactorsint hesecondrevision) , , ,broughtoutin1984, ,anumberofimportantbasicmodificationswit hrespecttoloadfactors,fieldvaluesofN, IS1893(Part1).

3 2002 Inthefifthrevision,withaviewtokeepabreas twiththerapiddevelopmentandextensiverese archthathasbeencarriedoutinthefieldofear thquakeresistantdesignofvariousstructure s, ,IS1893hasbeensplitintothefollowingfivep arts:Part1 GeneralprovisionsandbuildingsPart2 Liquidretainingtanks , , responsereductionfactor , , ,asfaraspossible,structuresareabletoresp ond, ,ithastobeemphasizedthatinthecaseofspeci alstructures,suchaslargeandtalldams,long -spanbridges,majorindustrialprojects,etc ,site-specificdetailedinvestigationshoul dbeundertaken, IS1893(Part1):2002 Thoughthebasisforthedesignofdifferenttyp esofstructuresiscoveredinthisstandard, ,constructionofatypewhichentailshea~ydeb risandconsequentlossoflifeandproperty,su chasmasonry,particularlymudmasonryandrub blemasonry, ,referencemaybemadetoIS4326, ,floods, ,therefore,importanttotakenecessarypreca utionsinthesiting, , ,islikelytoleadinsomecasestoanincorrectc onclusioninviewof(a)incorrectnessintheas sessmentofintensities,(b)humanerrorinjud gmentduringthedamagesurvey,and(c) ,consideredthatarationalapproachtothepro blemwouldbetoarriveatazoningmapbasedonkn ownmagnitudesandtheknownepicentres(seeAn nexA)assumingallotherconditionsasbeingav erageandtomodifisuchanidealizedisoseisma lmapinlightoftectonics(seeAnnexB),lithol ogy(seeAnnexC)

4 ,citiesandindustrialareas,aftermakingspe cialexaminationofsuchcases, , , , , ,therevisedseismiczoningmaphasgivenstatu sofZoneIIItoNarmadaTectonicDomain, ,thestandardgivesguidelinesforarrivingat designseismiccoet% ,usedinthedesignofanystructure, ,therefore,necessa~toindicatebroadlythes eismiccoefficientsthatcouldgenerallybead optedindifferentpartsorzonesofthecountry though,ofcourse, ( ) (MSK64)(seeAnnexD)broadlyassociatedwitht hevariouszonesisVI(orless),VII,VIIIandIX (andabove)forZonesII,III, IS1893(Part1) , , :a)UBC1994,UniformBuildingCode,Internati onalConferenceofBuildingOfficials,Whitti er,Ckdifomia, )NEHRP1991,NEHRPR ecommendedProvisionsfortheDevelopmentofS eismicRegulationsforNewBuildings,Part1:P rovisions, ,FederalEmergencyManagementAgency,Washin gtO% , , )NEHRP1991,NEHRPR ecommendedProvisionsfortheDevelopmentofS eismicRegulationsforNewBuildings,Part2:C ommentary, ,FederalEmergencyManagementAgency,Washin gton, , , )NZS4203:1992,CodeofPracticeforGeneralSt ructuralDesignandDesignLoadingsforBuildi ngs,StandardsAssociationofNewZealand,Wel lington,NewZealand, ,UniversityofRoorkee;IndianInstituteofTe chnology,KanpuqIITB ombay,Mumbai;GeologicalSurveyofIndia;Ind iaMeteorologicalDepartment, , ,thefinalvalueobservedorcalculated,expre ssingtheresultofatestoranalysis,shallber oundedoffinaccordancewithIS2:1960 Rulesforroundingoffnumericalvalues(revis ed).

5 Thenumberofsignflcantplacesretainedinthe roundedoffvalueshouldbethesameasthatofth especifiedvalueinthisstandard.(Earthquak eEngineeringSectionalCommittee,CED39)4 As in the Original Standard, this Page is Intentionally Left Blank IS1893(Part1):2002 IndianStandardCRITERIAFOREARTHQUAKERESIS TANTDESIGNOFSTRUCTURESPART1 GENERALPROVISIONSANDBUILDINGS(FfthRevisi on) (Part1) ;elevatedstructures;industrialandstackli kestructures;bridges;concretemasonryande arthdams; , ,referencemaybemadetothefollowingIndianS tandards:IS4326,1S13827,IS13828, :2000800:1984875(Partl):1987(Part2):1987 (Part3):1987(Part4):1987(Part5):1987 TitleCodeofpracticeforplainandreinforced concrete(fourthrevision)Codeofpracticefo rgeneralconstructioninsteel(secondrevisi on)Codeofpracticefordesignloads(othertha nearthquake)forbuildingsandstructures:De adloads Unitweightsofbuildingmaterialandstoredma terials(secondrevision)Imposedloads(seco ndrevision)Windloads(secondrevision)Snow loads(secondrevision)Specialloadsandload combinations(secondrevision) :19801498:19701888:19821893(Part4)2131:1 9812809:19722810:19794326:19936403:19811 3827:199313828:199313920:199313935.

6 1993 TitleCodeofpracticeforpre-stressedconcre te(firstrevision)Classificationandidenti ficationofsoilsforgeneralengineeringpurp oses(firstrevision)Methodofloadtestonsoi ls(secondrevision)Criteriaforearthquaker esistantdesignofstructures:Part4 Industrialstructuresincludingstacklikest ructuresMethodofstandardpenetrationtestf orsoils(firstrevision)Glossaryoftermsand symbolsrelatingtosoilengineering(jirstre vision)Glossaryoftermsrelatingtosoildyna mics(fzrstrevision)Earthquakeresistantde signandconstructionofbuildings Codeofpractice(secondrevision)Codeofprac ticefordeterminationofbearingcapacityofs hallowfoundations(firstrevision)Improvin gearthquakeresistanceofearthenbuildings GuidelinesImprovingearthquakeresistanceo flowstrengthmasonrybuildings GuidelinesDuctiledetailingofreinforcedco ncretestructuressubjectedtoseismicforces CodeofpracticeRepairandseismicstrengthen ingofbuildings GuidelinesSP6(6):1972 Handbookforstructuralengineers:Applicati onofplastictheoryindesignofsteelstructur es7 PrT- !

7 ? IS1893(Part) , ,imperfectelasticityofmaterial,slipping, sliding, (DBE) (Ah) , ,oritsmembers, (EPGA) (ZPA). (1)Itisafactorusedtoobtainthedesignseism icforcedependingonthefunctionaluseofthes tructure,characterisedbyhazardousconsequ encesofitsfailure,itspost-earthquakefunc tionalneed,historicvalue, , (seeAnnexD). ,structure, (Richter%Magnitude)Themagnitudeofearthqu akeisanumber, ,expressedinmicrons,whichthestandardshor t-periodtorsionseismometer( ,magnification2800anddampingnemlycritica l) scrustrevealingregionscharacterizedbystr ucturalfeatures,suchasdislocation,distor tion,faults,folding,thrusts,volcanoeswit htheirageofformation, , (Z)Itisafactortoobtainthedesignspectrumd ependingontheperceivedmaximumseismicrisk characterizedbyMaximumConsideredEarthqua ke(MCE) (ZPA) (frequenciesabove33Hz).-,. , , IS1893(Part1) (d)Basedimensionofthebuildingalongadirec tionisthedimensionatitsbase,inmetre, (e~i) (V~) ,ornearlyhorizontalsystem,whichtransmits lateralforcestotheverticalresistingeleme nts,forexample, (orbracedframes)andmomentresistingframes suchthat:a)Thetwosystemsaredesignedtores istthetotaldesignlateralforceinproportio ntotheirlateralstiffnessconsideringthein teractionofthedualsystematallfloorlevels ;andb) (hi) (k)Itisthedifferenceinlevels,inmetres, ,forexample,beams, (6).

8 (n) , ,itincludesthebasementstoreys, ,interactingwiththelateraldisplacementof buildingresultingfromseismicfor~ (e~l) (~) , :.4hA~bicdDL dleS1 ELXELYEL,FroofFi$?hhiIILh4kDesignhorizon talseismiccoefficientDesignhorizontalacc elerationspectrumvalueformode kofvibrationithFloorplandimensionofthebu ildingperpendiculartothedirectionofforce Indexfortheclosely-spacedmodesBasedimens ionofthebuilding,inmetres, ,inmetresHeightmeasuredfromthebaseoftheb uildingtoflooriImportancefactorResponseq uantityduetoimposedloadModalmassofmodek1 1nNPkQ,Q~~rRS a/gT~TkT1 VBpBqqkvroofwWizOika%kcA*IS1893(Part1) (insecond)Approximatefundamentalperiod(i nseconds)Undampednaturalperiodofmodekofv ibration(insecond)Fundamentalnaturalperi odofvibration(insecond)Designseismicbase shearDesignbaseshearcalculatedusingtheap proximatefimdamentalperiodT,Peakstoreysh earforceinstoreyiduetoallmodesconsidered ShearforceinstoreyiinmodekPeakstoreyshea rforceattheroofduetoallmodesconsideredSe ismicweightofthestructureSeismicweightof flooriZonefactorModeshapecoet%cientatflo oriinmodekPeakresponse(forexamplememberf orces,displacements,storeyforces,storeys hearsorbasereactions)duetoallmodesconsid eredAbsolutevalueofmaximumresponseinmode kAbsolutevalueofmaximumresponseinmodec, IS1893(Part1).

9 2002 PijCoefficientusedintheCompleteQuadratic Combination(CQC) (intensity,duratio~etc)ofseismicgroundvi brationsexpectedatanylocationdependsupon themagnitudeofearthquake,itsdepthoffocus ,distancefromtheepicentre,characteristic softhepaththroughwhichtheseismicwavestra vel, ,whichcausethestructuretovibrate, ,thoseinwhichstabilityisacriterionfordes ign, ,specialattentionshouldbepaidtotheeffect ofverticalcomponentofthegroundmotiononpr estressedorcantileveredbeams, ;materials,form,sizeandmodeofconstructio nofstructures; , (<DBE),whichoccurfrequently,withoutdamag e;resistmoderateearthquakes(DBE)withouts ignificantstructuraldamagethoughsomenon- structuraldamagemayOCCUE andaimsthatstructureswithstandamajoreart hquake(MCE)withoutcollapse, ,ductility,arisingfrominelasticmaterialb ehaviouranddetailing,andoverstrength,ari singfromtheadditionalreservestrengthinst ructuresoverandabovethedesignstrength, , ,Insteelstructures,membersandtheirconnec tionsshouldbesoproportionedthathighducti lityisobtain~tideSP6(Part6), ,theprovisionofthisstandardfordesign, ,thedesignlateralforceshallbeconsidereda longonedirectionatatime, ,havinglateralforceresistingelements(for exampleframes,shearwalls)indirectionsoth erthanthetwoorthogonaldirections, , ,whicharesupportedatvariousfloorlevelsof thestructure, , (Part4).

10 :a) IS1893(Part1):2002b)Anadditionthatisnots tructurallyindependentfromanexistingstru ctureshallbedesignedandconstructedsuchth attheentirestructureconformstotheseismic forceresistancerequirementsfornewstructu resunlessthefollowingthreeconditionsarec ompliedwith:1)2)3)Theadditionshallcomply withtherequirementsfornewstructures,Thea dditionshallnotincreasetheseismicforcesi nanystructuralelementsoftheexistingstruc turebymorethan5percentunlessthecapacityo ftheelementsubjecttotheincreasedforceiss tillincompliancewiththisstandard, (1), :a)b)c)Earthquakecausesimpulsivegroundmo tions,whicharecomplexandirregularinchara cter, ,resonanceofthetypeasvisualizedunderstea dy-statesinusoidalexcitations, However, ,Thevalueofelasticmodulusofmaterials,whe reverrequired,maybetakenasforstaticanaly sisunlessamoredefinitevalueisavailablefo ruseinsuchcondition(seeIS456,IS1343andIS 800) , ,ILandELstandfortheresponsequantitiesdue todeadload, ,thefollowingloadcombinationsshallbeacco untedfor:1) (DL.