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外文翻译--冷弯型钢框架结构设计方法.doc

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外文翻译--冷弯型钢框架结构设计方法.doc

PRESCRIPTIVEMETHODFORRESIDENTIALCOLDFORMEDSTEELFRAMINGSecondEditionPreparedforTheU.S.DepartmentofHousingandUrbanDevelopmentOfficeofPolicyDevelopmentandResearchWashington,DCCoSponsoredbyTheAmericanIronandSteelInstituteWashington,DCandTheNationalAssociationofHomeBuildersWashington,DCbyNAHBResearchCenter,Inc.400PrinceGeorgesBoulevardUpperMarlboro,MD207748731August1997CONTENTS5.0STEELFLOORFRAMING..............................................................................................215.1FloorConstruction................................................................................................215.2FloortoFoundationorBearingWallConnection................................................215.3AllowableJoistSpans..........................................................................................215.4JoistBracing.........................................................................................................215.5FloorCantilevers..................................................................................................225.6Splicing.................................................................................................................225.7FramingofFloorOpenings..................................................................................225.8FloorTrusses........................................................................................................225.0STEELFLOORFRAMING5.1FloorConstructionColdformedsteelframingmembersshallcomplywiththeprovisionsofSection2.0.SteelfloorsshallbeconstructedinaccordancewiththissectionandFigure5.1.5.1.1ApplicabilityLimitsTheapplicabilitylimitsofSection1.3andTable1.1shallapply.5.1.2InLineFraming.Loadbearingsteelfloorframing,wallframing,andceiling/roofframingshallbeconstructedinlinewiththeverticalloadbearingmembersi.e.studslocatedbelow.Amaximumtoleranceof3/4inch19mmbetweenthecenterlinesoftheinlinemembersshallbepermittedinaccordancewithFigure1.2.5.2FloortoFoundationorBearingWallConnectionColdformedsteelfloorframingshallbeanchoredtofoundations,woodsills,orloadbearingwallsinaccordancewithTable5.1andFigures5.1through5.10.FasteningofsteeljoiststootherframingmembersshallbeinaccordancewithTable5.2.5.3AllowableJoistSpansTheclearspanofcoldformedsteelfloorjoistsshallnotexceedthelimitssetforthinTable5.3forsinglespansandTable5.4formultiplespans.Whencontinuousjoistmembersareusedformultiplespans,theinteriorbearingsupportsshallbelocatedwithintwofeet0.6mofmidspanofthesteeljoists,andtheindividualspansshallnotexceedtheapplicablespansinthetable.Floorjoistsshallhaveabearingsupportlengthofnotlessthan1.5inches38mmforexteriorwallsupportsand3.5inches89mmforinteriorwallsupports.BearingstiffenersshallbeinstalledateachjoistbearinglocationinaccordancewithSection2.9.Thethicknessofjoisttracksshallbeaminimumof33mils0.84mmthickexceptwhenusedaspartoffloorheaderortrimmerinaccordancewithSection5.7.5.4JoistBracingThetopflangesoffloorjoistsshallbelaterallybracedbytheapplicationoffloorfastenedtothejoistsinaccordancewithTable5.2.Floorjoistswithspansthatexceed12feet3.7mshallhavethebottomflangeslaterallybracedinaccordancewithoneofthefollowing1.Gypsumboardinstalledwithminimum6screwsinaccordancewiththeapplicablebuildingcode,or2.ContinuoussteelstrappinginstalledinaccordancewithFigure5.1and5.2.Steelstrapsshallbeatleast11/2inches38mminwidthand33mils0.84mminthickness.Strapsshallbefastenedtothebottomflangeofeachjoistwithatleastone8screwandshallbefastenedtoblockingwithatleasttwo8screws.BlockingorbridgingXbracingshallbeinstalledbetweenjoistsatamaximumspacingof12feet3.7mmeasuredalongthecontinuousstrappingperpendiculartothejoistrun.Blockingorbridgingshallalsobelocatedattheterminationofallstraps.5.5FloorCantileversFloorcantileversforthesecondfloorofatwostorybuildingorthefirstfloorofaonestorybuildingshallnotexceed24inches610mmasillustratedinFigure5.1.Cantileversshallsupportinteriorfloorloadingonly.Cantilevers,notexceeding24inches610mmandsupportingonefloorandrooffirstfloorofatwostorybuilding,shallbepermittedprovidedthatallcantileveredjoistsaredoublednestedorbacktoback.Thedoubledcantileveredjoistsshallextendaminimumof6feet1.8mtowardtheinsideandshallbefastenedwithaminimumoftwo8screwsspacedat24inches610mmoncenterthroughthewebsforbacktobackorflangesfornestedjoists.Approveddesignisrequiredforcantileveredareassupportinguniformliveloadsgreaterthan40psf1.92kN/m2.5.6SplicingJoistsandotherstructuralmembersshallnotbesplicedwithoutanapproveddesign.SplicingoftracksshallconformwithFigure5.11.5.7FramingofFloorOpeningsOpeningsinfloorsshallbeframedwithheaderandtrimmerjoists.Headerjoistspansshallnotexceed8feet2.4minlength.Headerandtrimmerjoistsshallbefabricatedfromjoistandtracksections,whichshallbeofaminimumsizeandthicknessastheadjacentfloorjoistsandshallbeinstalledinaccordancewithFigures5.1,5.12,and5.13.Eachheaderjoistshallbeconnectedtotrimmerjoistswithaminimumoffour2inchx2inch51mmx51mmclipangles.Eachclipangleshallbefastenedtoboththeheaderandtrimmerjoistswithfour8screwsevenlyspacedoneachlegoftheclipangle.Theclipanglesshallhaveathicknessnotlessthanthatofthefloorjoist.5.8FloorTrussesColdformedsteelfloortrussesshallbedesigned,braced,andinstalledinaccordancewithanapproveddesign.Trussmembersshallnotbenotched,cut,oralteredinanymannerunlessbyanapproveddesign.Alltrussesshallbealignedwithloadcarryingmembersi.e.studsinthewall.RefertoAISIpublicationRG951817DesignGuideForColdFormedSteelTrussesforadditionalguidance.

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