1、PRESCRIPTIVEMETHODFORRESIDENTIALCOLD-FORMEDSTEELFRAMINGSecondEditionPreparedforTheU/S/DepartmentofHousingandUrbanDevelopmentOfficeofPolicyDevelopmentandResearchWashington/DCCo-SponsoredbyTheAmericanIronandSteelInstituteWashington/DCandTheNationalAssociationofHomeBuildersWashington/DCbyNAHBResearchCe
2、nter/Inc/400PrinceGeorgesBoulevardUpperMarlboro/MD20774-8731August1997CONTENTS5/0STEELFLOORFRAMING/215/1FloorConstruction/215/2FloortoFoundationorBearingWallConnection/215/3AllowableJoistSpans/215/4JoistBracing/215/5FloorCantilevers/225/6Splicing/225/7FramingofFloorOpenings/225/8FloorTrusses/225/0ST
3、EELFLOORFRAMING5/1FloorConstructionCold-formedsteelframingmembersshallcomplywiththeprovisionsofSection2/0/SteelfloorsshallbeconstructedinaccordancewiththissectionandFigure5/1/5/1/1ApplicabilityLimitsTheapplicabilitylimitsofSection1/3andTable1/1shallapply/5/1/2In-LineFraming/Loadbearingsteelfloorfram
4、ing/wallframing/andceiling/roofframingshallbeconstructedin-linewiththeverticalloadbearingmembers(i/e/studs)locatedbelow/Amaximumtoleranceof3/4inch(19mm)betweenthecenterlinesofthein-linemembersshallbepermittedinaccordancewithFigure1/2/5/2FloortoFoundationorBearingWallConnectionCold-formedsteelfloorfr
5、amingshallbeanchoredtofoundations/woodsills/orloadbearingwallsinaccordancewithTable5/1andFigures5/1through5/10/FasteningofsteeljoiststootherframingmembersshallbeinaccordancewithTable5/2/5/3AllowableJoistSpansTheclearspanofcold-formedsteelfloorjoistsshallnotexceedthelimitssetforthinTable5/3forsingles
6、pansandTable5/4formultiplespans/Whencontinuousjoistmembersareusedformultiplespans/theinteriorbearingsupportsshallbelocatedwithintwofeet(0/6m)ofmid-spanofthesteeljoists/andtheindividualspansshallnotexceedtheapplicablespansinthetable/Floorjoistsshallhaveabearingsupportlengthofnotlessthan1/5inches(38mm
7、)forexteriorwallsupportsand3/5inches(89mm)forinteriorwallsupports/BearingstiffenersshallbeinstalledateachjoistbearinglocationinaccordancewithSection2/9/Thethicknessofjoisttracksshallbeaminimumof33mils(0/84mm)thickexceptwhenusedaspartoffloorheaderortrimmerinaccordancewithSection5/7/5/4JoistBracingThe
8、topflangesoffloorjoistsshallbelaterallybracedbytheapplicationoffloorfastenedtothejoistsinaccordancewithTable5/2/Floorjoistswithspansthatexceed12feet(3/7m)shallhavethebottomflangeslaterallybracedinaccordancewithoneofthefollowing/1/Gypsumboardinstalledwithminimum#6screwsinaccordancewiththeapplicablebu
9、ildingcode/or2/ContinuoussteelstrappinginstalledinaccordancewithFigure5/1and5/2/Steelstrapsshallbeatleast1-1/2inches(38mm)inwidthand33mils(0/84mm)inthickness/Strapsshallbefastenedtothebottomflangeofeachjoistwithatleastone#8screwandshallbefastenedtoblockingwithatleasttwo#8screws/Blockingorbridging(X-
10、bracing)shallbeinstalledbetweenjoistsatamaximumspacingof12feet(3/7m)measuredalongthecontinuousstrapping(perpendiculartothejoistrun)/Blockingorbridgingshallalsobelocatedattheterminationofallstraps/5/5FloorCantileversFloorcantileversforthesecondfloorofatwo-storybuildingorthefirstfloorofaone-storybuild
11、ingshallnotexceed24inches(610mm)asillustratedinFigure5/1/Cantileversshallsupportinteriorfloorloadingonly/Cantilevers/notexceeding24inches(610mm)andsupportingonefloorandroof(firstfloorofatwostorybuilding)/shallbepermittedprovidedthatallcantileveredjoistsaredoubled(nestedorback-to-back)/Thedoubledcant
12、ileveredjoistsshallextendaminimumof6feet(1/8m)towardtheinsideandshallbefastenedwithaminimumoftwo#8screwsspacedat24inches(610mm)oncenterthroughthewebs(forback-to-back)orflanges(fornestedjoists)/Approveddesignisrequiredforcantileveredareassupportinguniformliveloadsgreaterthan40psf(1/92kN/m2)/5/6Splici
13、ngJoistsandotherstructuralmembersshallnotbesplicedwithoutanapproveddesign/SplicingoftracksshallconformwithFigure5/11/5/7FramingofFloorOpeningsOpeningsinfloorsshallbeframedwithheaderandtrimmerjoists/Headerjoistspansshallnotexceed8feet(2/4m)inlength/Headerandtrimmerjoistsshallbefabricatedfromjoistandt
14、racksections/whichshallbeofaminimumsizeandthicknessastheadjacentfloorjoistsandshallbeinstalledinaccordancewithFigures5/1/5/12/and5/13/Eachheaderjoistshallbeconnectedtotrimmerjoistswithaminimumoffour2inchx2inch(51mmx51mm)clipangles/Eachclipangleshallbefastenedtoboththeheaderandtrimmerjoistswithfour#8
15、screwsevenlyspacedoneachlegoftheclipangle/Theclipanglesshallhaveathicknessnotlessthanthatofthefloorjoist/5/8FloorTrussesCold-formedsteelfloortrussesshallbedesigned/braced/andinstalledinaccordancewithanapproveddesign/Trussmembersshallnotbenotched/cut/oralteredinanymannerunlessbyanapproveddesign/Alltrussesshallbealignedwithloadcarryingmembers(i/e/studs)inthewall/RefertoAISIpublicationRG-951817“DesignGuideForCold-FormedSteelTrusses”foradditionalguidance/
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