LRFD-Specification-for-Structural-Steel-Buildings-

ErrataList,September4,2001AISCLoadandResistanceFactorDesignSpecificationforStructuralSteelBuildings,December27,1999ThefollowingeditorialcorrectionshavebeenmadeintheFirstRevision,September4,2001.Tofacilitatetheincorporationofthesecorrections,thisbooklethasbeenconstructedusingcopiesoftherevisedpages,withcorrectionsnoted.Theusermayfinditconvenientinsomecasestohand-writeacorrection;inothers,acut-and-pasteapproachmaybemoreefficient.andQuenched-and-TemperedAlloyStructuralSteelPlatesforBridges,ASTMA709/A709MQuenchedandTemperedLow-AlloyStructuralSteelPlatewith70ksi(485MPa)MinimumYieldStrengthto4in.(100mm)Thick,ASTMA852/A852MHigh-StrengthLow-AlloySteelShapesofStructuralQuality,ProducedbyQuenchingandSelf-TemperingProcess(QST),ASTMA913/A913MSteelforStructuralShapesforUseinBuildingFraming,ASTMA992/A992MCertifiedmilltestreportsorcertifiedreportsoftestsmadebythefabricatororatest-inglaboratoryinaccordancewithASTMA6/A6M,StandardSpecificationforGeneralRequirementsforRolledStructuralSteelBars,Plates,Shapes,andSheetPilingorA568/A568M,StandardSpecificationforSteel,Sheet,Carbon,andHigh-Strength,Low-Alloy,Hot-RolledandCold-Rolled,GeneralRequirementsfor,asapplicable,shallconstitutesufficientevidenceofconformitywithoneoftheaboveASTMstandards.Ifrequested,thefabricatorshallprovideanaffidavitstat-ingthatthestructuralsteelfurnishedmeetstherequirementsofthegradespecified.1b.UnidentifiedSteelUnidentifiedsteel,ifsurfaceconditionsareacceptableaccordingtocriteriacon-tainedinASTMA6/A6M,ispermittedtobeusedforunimportantmembersordetails,wheretheprecisephysicalpropertiesandweldabilityofthesteelwouldnotaffectthestrengthofthestructure.1c.HeavyShapesForASTMA6/A6MGroup4and5rolledshapestobeusedasmemberssubjecttoprimarytensilestressesduetotensionorflexure,toughnessneednotbespecifiedifsplicesaremadebybolting.Ifsuchmembersaresplicedusingcomplete-joint-pen-etrationgroovewelds,thesteelshallbespecifiedinthecontractdocumentstobesuppliedwithCharpyV-notch(CVN)impacttestinginaccordancewithASTMA6/A6M,SupplementaryRequirementS5.Theimpacttestshallmeetaminimumaveragevalueof20ft-lbs.(27J)absorbedenergyat+70°F(+21°C)andshallbeconductedinaccordancewithASTMA673/A673M,withthefollowingexceptions:(1)Thecenterlongitudinalaxisofthespecimensshallbelocatedasnearaspracti-caltomidwaybetweentheinnerflangesurfaceandthecenteroftheflangethicknessattheintersectionwiththewebmid-thickness.(2)Testsshallbeconductedbytheproduceronmaterialselectedfromalocationrepresentingthetopofeachingotorpartofaningotusedtoproducetheprod-uctrepresentedbythesetests.Forplatesexceedingtwo-in.(50mm)thickusedforbuilt-upcross-sectionswithboltedsplicesandsubjecttoprimarytensilestressesduetotensionorflexure,mate-rialtoughnessneednotbespecified.Ifsuchcross-sectionsaresplicedusingcom-plete-joint-penetrationwelds,thesteelshallbespecifiedinthecontractdocumentstobesuppliedwithCharpyV-notchtestinginaccordancewithASTMA6/A6M,SupplementaryRequirementS5.Theimpacttestshallbeconductedbythepro-ducerinaccordancewithASTMA673/A673M,FrequencyP,andshallmeetamin-imumaveragevalueof20ft-lbs.(27J)absorbedenergyat+70°F(+21°C).Theabovesupplementaryrequirementsalsoapplywhencomplete-joint-penetra-LRFDSpecificationforStructuralSteelBuildings,December27,1999AMERICANINSTITUTEOFSTEELCONSTRUCTIONSect.A3.]MATERIAL3Cold-FormedWeldedandSeamlessHigh-Strength,Low-AlloyStructuralTubingwithImprovedAtmosphericCorrosionResistance,ASTMA847Errata9/4/01LRFDSpecificationforStructuralSteelBuildings,December27,1999AMERICANINSTITUTEOFSTEELCONSTRUCTIONSect.B10.]PROPORTIONSOFBEAMSANDGIRDERS15TABLEB5.1(cont.)LimitingWidth-ThicknessRatiosforCompressionElementsDescriptionofElementWidthThick-nessRatioLimitingWidth-ThicknessRatios
p(compact)
r(noncompact)StiffenedElementsFlangesofrectangularboxandhollowstructuralsectionsofuniformthicknesssubjecttobendingorcompression;flangecoverplatesanddia-phragmplatesbetweenlinesoffastenersorweldsforuniformcompressionforplasticanalysisb/tUnsupportedwidthofcoverplatesperforatedwithasuc-cessionofaccessholes[b]b/tNAWebsinflexuralcompression[a]h/twWebsincombinedflexuralandaxialcompressionh/twforPu/bPy0.125[c],[g][h]forPu/bPy0.125[c][g]Allotheruniformlycompres-sedstiffenedelements,i.e.,supportedalongtwoedgesb/th/twNACircularhollowsectionsInaxialcompressionInflexureD/t[d]NA0.07E/Fy0.11E/Fy0.31E/Fy[a]Forhybridbeams,usetheyieldstrengthoftheflangeFyfinsteadofFy.[b]Assumesnetareaofplateatwidesthole.[c]Assumesaninelasticrotationcapacityof3radians.Forstructuresinzonesofhighseismicity,agreaterrotationcapacitymayberequired.[d]Forplasticdesignuse0.045E/Fy.[e]FL=smallerof(Fyf–Fr)orFyw,ksi(MPa)[e]Fr=compressiveresidualstressinflange[e]FL=10ksi(69MPa)forrolledshapes[e]FL=16.5ksi(114MPa)forweldedshapes[f]khtcw=4/and0.35kc0.763[g]Formemberswithunequalflanges,usehpinsteadofhwhencomparingtop.[h]Formemberswithunequalflanges,seeAppendixB5.1.yEF1.40/yEF1.86/yEF5.70/[h]yEF3.76/[c],[g]−φubyyPEPF2.753.761−uybyPEFP5.7010.74
...−≥φuybyyPEFPEF112233149.yE/F149yEF1.12/yEF0.939/-Assumesaninelasticductilityratio(ratioofstrainatf