American standard building code requirements for minimum …

1 , ,DirectorNATIONALBUREAUOFSTANDARDSMISCEL LANEOUSPUBLICATIONM179 AMERICANSTANDARDBUILDINGCODEREQUIREMENTS FORMINIMUMDESIGNLOADSINBUILDINGSANDOTHER STRUCTURESBySectionalCommitteeonBuilding CodeRequirementsforMinimumDesignLoadsinB uildings A58 UndertheSponsorshipoftheNationalBureauof StandardsIssuedOctober18,1945 ApprovedJune19,1945, :1945 ForsalebytheSuperintendentofDocuments, , , ,live,wind, ,BuildingCodeStandard-ization, ,DirectorSECTIONALCOMMITTEET henersonneloftheSectionalCommitteeonBuil dingCodeRe-n^^^mmimnRDesignLoadsmBuHdrng s-ASS,whichdevelopedthestandard,isasfoll ows:NationalBureauofStandards, ,Chairman,jHCourtney, (Alternate).

2 AmericanSocietyofCivilEngineersJ*- .BuildingOfficialsConferenceofAmerica-J^ A Easton(Alternate).CoastandGeodeticSurvey , ^SST^' ^:-y^"^^_^^ "EstateBo^ , ^Thompson.^b -ss-w z"-::-^---? (includingsnowloads) , <6-5, ". (a). (includingsnowloads) ]\ | ~ * AmericanStandardBuildingCodeRequirements forMinimumDesignLoadsinBuildingsandOther StructuresBySectionalCommitteeonBuilding CodeRequirementsforMinimumDesignLoadsinB uildings A58 UndertheSponsorshipoftheNationalBureauof StandardsABSTRACTB uildingCodeRequirementsforMinimumDesignL oadsinBuildingsandOtherStructures(ASA )

3 Givesassumptionsfordead,live,wind, ,pre-paredbyAmericanStandardsAssociation SectionalCommitteeA58underthesponsorship oftheNationalBureauofStandards, , Theserequirementsareintendedtogovernassu mptionsfordead,live, , "permanentconstructionandequipment,inclu dingwalls,framing,floors,roofs,permanent par-titions,andstairways, Buildingsorotherstructures,andallartsthe reof,shallbedesignedandconstructedtosupp ortsafelyalloads,includingdeadloads, Whenanexistingbuildingortherstructureise nlargedorotherwisealtered,allportionsthe reofffectedbysuchenlargementoralteration shallbestrengthened,ifecessary, , Inestimatingdeadloadsforpurposesofdesign ,theactualweightsofmaterialsandcon-struc tionsshallbeused, Forinformationondeadloads,seeappendix, Inestimatingdeadloadsforpurposesofdesign ,theweightofplumbingstacksandrisers,elec tricfeeders, (a)

4 Theliveloadsassumedforpurposesofdesignsh allbethegreatestloadsthatprobablywillbep roducedbytheintendedoccu-panciesoruses,p rovidedthattheliveloadstobeconsideredasu ni-formlydistributedshallbenotlessthanth evaluesgiveninthefollowingtable:OCCUPANC YORUSELIVELOADA partmenthouses:lb/ft2 Privateapartments40 Publicstairways100 Assemblyhalls:Fixedseats60 Movableseats100 Corridors,upperfloors100 Corridors:Firstfloor100 Otherfloors, ,public100 Dwellings40 Hospitalsandasylums:Operatingrooms60 Privaterooms40 Wards_*40 Publicspace80 Hotels:Guestrooms1_40 Corridorsservingpublicrooms100 Publicrooms100 Loftbuildings__-_125 Manufacturing,light125 Officebuildings:Offices80 Lobbies100 Schools:Classrooms40 Corridors100 Stores:125 Theaters.

5 Aisles,corridors,andlobbies100 Orchestrafloor60 Balconies60 Stagefloor150 MinimumDesignLoadsinBuildings(b)Whenoccu panciesorusesnotlistedaboveareinvolved, Forinformationonliveloads,seeappendix, Inofficebuildingsorother'buildingswherep artitionsmightbesubjecttoerectionorrearr angement,pro-visionforpartitionweightsha llbemade,whetherornotpartitionsareshowno ntheplans, Inthedesignoffloors, ,orthefollowingminimumcon-centrations, ){ ,includingcorridors2, " Whentheconstructionissuchthatthestruc-tu ralelementsthereofacttogetherinthenature ofanelasticframeduetotheircontinuityandt herigidityoftheconnections,andtheliveloa dexceeds150poundspersquarefootortwicethe deadload, TheliveloadsspecifiedinSection3-1(a) ,suchasthoseresultingfrommovingmachinery ,elevators,craneways,vehicles,etc.}

6 , (a)Noreductionshallbeappliedtotheroofliv eload.(b)Forliveloadsof100poundsorlesspe rsquarefoot, , :I*=100> <Sz'inwhich#=reductioninpercentZ ?=deadloadpersquarefootofareasupportedby thememberL= ,noreductionshallbemade,exceptthatthedes ignliveloadsoncolumnsmaybe' Itshallbeunlawfultoplace,orcauseorpermit tobeplaced, 4524 MiscellaneousPublications, Ineverybuildingorotherstructure,orpartth ereof,usedformercantile,business,industr ial,orstoragepurposes,theloadsapprovedby thebuildingofficialshallbemarkedonplates ofapproveddesignwhichshallbesuppliedands ecurelyaffixedIqytheownerofthebuilding,o rhisdulyauthorizedagent, ,iflost,removed,ordefaced.

7 (includingsnowloads).(a)Ordinaryroofs,ei therflatorpitched,shallbedesignedforaloa dofnotlessthan20poundspersquarefootofhor izontalprojectioninadditiontothedeadload ,andinadditiontoeitherthewindorearthquak eload, ,themapshowninfigure1intheappendixshould beconsultedandtheindicatedsnowloadforthe *locality,iflarger,sub-stitutedforthismi nimum.(b) (a)Stairtreadsshallbedesignedtosupportau niformlydis-tributedloadof100poundspersq uarefoot,orconcentratedloadsof300poundss paced3feetcentertocentereachoccupyingana rea1footwidebythedepthofthetread,whichev erwillproducethegreaterstresses.

8 (b)Sidewalksshallbedesignedtosupporteith erauniformlydistributedloadof250poundspe rsquarefoot,oraconcentratedloadof8,000po undsonanarea2%feetsquareplacedinanyposit ion,whicheverwillproducethegreaterstress es.(c)Drivewaysshallbedesignedtosupporta uniformlydistributedloadof100poundspersq uarefootforvehiclesweighinglessthan3tons withload,150poundspersquarefootforvehicl esweighing3to10tonswithload,200poundsper squarefootforvehiclesweighingover10tonsw ithload,oraconcentratedloadequaltothemax imumexpectedwheelloadonanarea2){feetsqua replacedinanyposition,whicheverwillprodu cethegreaterstresses.}

9 (d)Accessibleceilings,scuttles,andribsof skylightsshallbedesignedtosupportaconcen tratedloadof200poundsoccupyinganarea2){f eetsquare,andsoplacedastoproducemaximums tressesintheaffectedmembers.(e)Stairwaya ndbalconyrailings,bothexteriorandinterio r, Inthedesignofbasementwallsandsimilarappr oximatelyverticalstructuresbelowgrade, ,orthewhole,oftheadjacentsoilisbelowafre e-watersurface,computationsshallbebasedo ntheweightofthesoildimin-ishedbybuoyancy , Inthedesignofbasementfloorsandsimilarapp roximatelyhorizontalconstructionbelowgra de,theupwardpressureofwater,ifany, Buildingsorotherstructuresshallbedesigne dandconstructedtowithstandthehorizontalp res-suresshowninthefollowingtable.}

10 *Lessthan50_ _____2050to9924100to19928200to29930300to 39932400to49933500to59934600to79935800to 999361,000to1,199371,200to1,399381,400to 1,599391, , (indicated63bya4-cupanemome-ter)at30feet fromtheground.< Every,exteriorwallshallbedesignedandcon- 'structedtowithstandthepressuresspecifie dinSection5-1,MinimumIDesignPressures, (a)Theroofsofallbuildingsorotherstructur esshallbedesignedandconstructedtowithsta ndpressures,actingoutwardnormaltothesurf ace, ,andthepres-sureassumedontheentireroofar ea.(b)Roofsorsectionsofroofswithslopesgr eaterthan30 shallbedesignedandconstructedtowithstand pressures,actinginwardnormal5 MiscellaneousPublications,NationalBureau ofStandardstothesurface,equaltothosespec ifiedfortheheightzoneinwhichtheroofisloc ated,andappliedtothewindwardslopeonly.