2005 AISC Specification for Structural Steel Buildings

518 Pages·2005·6.14 MB·English

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ANSI/AISC 360-05
An American National Standard
Specification
for Structural Steel Buildings
March 9, 2005
Supersedes the Load and Resistance Factor Design Specification for Structural Steel
Buildings dated December 27, 1999, the Specification for Structural Steel Buldings—
Allowable Stress Design and Plastic Design dated June 1, 1989, including Supplement
No. 1, the Specification for Allowable Stress Design of Single-Angle Members
dated June 1, 1989, the Load and Resistance Factor Design Specification for Single-
Angle Members dated November 10, 2000, and the Load and Resistance Factor
Design Specification for the Design of Steel Hollow Structural Sections
dated November 10, 2000, and all previous versions of these specifications.
Approved by the AISC Committee on Specifications and issued by the
AISC Board of Directors
AMERICAN INSTITUTE OF STEEL CONSTRUCTION, INC.
One East Wacker Drive, Suite 700
Chicago, Illinois 60601-1802
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Copyright(cid:1)c 2005
by
AmericanInstituteofSteelConstruction,Inc.
Allrightsreserved.Thisbookoranypartthereof
mustnotbereproducedinanyformwithoutthe
writtenpermissionofthepublisher.
Theinformationpresentedinthispublicationhasbeenpreparedinaccordancewith
recognized engineering principles and is for general information only. While it is
believedtobeaccurate,thisinformationshouldnotbeusedorrelieduponforany
specific application without competent professional examination and verification
ofitsaccuracy,suitability,andapplicabilitybyalicensedprofessionalengineer,de-
signer,orarchitect.Thepublicationofthematerialcontainedhereinisnotintended
asarepresentationorwarrantyonthepartoftheAmericanInstituteofSteelCon-
structionorofanyotherpersonnamedherein,thatthisinformationissuitablefor
any general or particular use or of freedom from infringement of any patent or
patents.Anyonemakinguseofthisinformationassumesallliabilityarisingfrom
suchuse.
Caution must be exercised when relying upon other specifications and codes de-
velopedbyotherbodiesandincorporatedbyreferencehereinsincesuchmaterial
maybemodifiedoramendedfromtimetotimesubsequenttotheprintingofthis
edition.TheInstitutebearsnoresponsibilityforsuchmaterialotherthantorefer
to it and incorporate it by reference at the time of the initial publication of this
edition.
PrintedintheUnitedStatesofAmerica
SpecificationforStructuralSteelBuildings,March9,2005
AMERICANINSTITUTEOFSTEELCONSTRUCTION,INC.
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DEDICATION
ProfessorLynnS.Beedle
ThiseditionoftheAISCSpecificationisdedicatedtothememoryofDr.LynnS.Beedle,
UniversityDistinguishedProfessoratLehighUniversity.Dr.Beedleservedasafaculty
memberatLehighUniversityfor41yearsandwonaverylargenumberofprofessional
andeducationalawards,includingthe1973T.R.HigginsAwardandthe2003Geerhard
HaaijerAwardfromAISC.HewasamajorcontributortoseveraleditionsoftheAISC
Specificationandalong-timememberoftheAISCCommitteeonSpecifications.Hewas
instrumentalinthedevelopmentofplasticdesignmethodologiesanditsimplementation
intotheAISCSpecification.HewasDirectoroftheStructuralStabilityResearchCouncil
for 25 years, and in that role fostered understanding of various stability problems and
helped develop rational design provisions, many of which were adopted in the AISC
Specifications. In 1969, he founded the Council on Tall Buildings and Urban Habitat
andsucceededinbringingtogetherthedisciplinesofarchitecture,structuralengineer-
ing,construction,environment,sociologyandpolitics,whichunderlieeverymajortall
buildingproject.Hewasactivelyinvolvedinthiseffortuntilhisdeathinlate2003atthe
ageof85.Hiscontributionstothedesignandconstructionofsteelbuildingswilllong
be remembered by AISC, the steel industry and the structural engineering profession
worldwide.
ForamorecompletediscussionofDr.Beedle’slifeandaccomplishments,seeCatalystfor
SkyscraperRevolution:LynnS.Beedle—ALegendinhisLifetimebyMirAli,published
bytheCouncilonTallBuildingsandUrbanHabitat(2004).
SpecificationforStructuralSteelBuildings,March9,2005
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SpecificationforStructuralSteelBuildings,March9,2005
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PREFACE
(ThisPrefaceisnotpartofANSI/AISC360-05,SpecificationforStructuralSteelBuild-
ings,butisincludedforinformationalpurposesonly.)
This Specification has been based upon past successful usage, advances in the state
of knowledge, and changes in design practice. The 2005 American Institute of Steel
Construction’sSpecificationforStructuralSteelBuildingsforthefirsttimeprovidesan
integratedtreatmentofAllowableStressDesign(ASD)andLoadandResistanceFactor
Design(LRFD),andthuscombinesandreplacesearlierSpecificationsthattreatedthe
twodesignmethodsseparately.AsindicatedinChapterBoftheSpecification,designs
canbemadeaccordingtoeitherASDorLRFDprovisions.
This Specification has been developed as a consensus document to provide a uniform
practiceinthedesignofsteel-framedbuildingsandotherstructures.Theintentionisto
providedesigncriteriaforroutineuseandnottoprovidespecificcriteriaforinfrequently
encounteredproblems,whichoccurinthefullrangeofstructuraldesign.
ThisSpecificationistheresultoftheconsensusdeliberationsofacommitteeofstruc-
tural engineers with wide experience and high professional standing, representing a
wide geographical distribution throughout the United States. The committee includes
approximatelyequalnumbersofengineersinprivatepracticeandcodeagencies,engi-
neers involved in research and teaching, and engineers employed by steel fabricating
andproducingcompanies.Thecontributionsandassistanceofmorethan50additional
professionalvolunteersworkingintentaskcommitteesarealsoherebyacknowledged.
TheSymbols,GlossaryandAppendicestothisSpecificationareanintegralpartofthe
Specification.Anon-mandatoryCommentaryhasbeenpreparedtoprovidebackground
fortheSpecificationprovisionsandtheuserisencouragedtoconsultit.Additionally,non-
mandatoryUserNotesareinterspersedthroughouttheSpecificationtoprovideconcise
andpracticalguidanceintheapplicationoftheprovisions.
Thereaderiscautionedthatprofessionaljudgmentmustbeexercisedwhendataorrec-
ommendationsintheSpecificationareapplied,asdescribedmorefullyinthedisclaimer
noticeprecedingthisPreface.
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vi PREFACE
ThisSpecificationwasapprovedbytheCommitteeonSpecifications,
JamesM.Fisher,Chairman TonyC.Hazel
RogerE.Ferch,ViceChairman MarkV.Holland
HansrajG.Ashar LawrenceA.Kloiber
WilliamF.Baker RobertoT.Leon
JohnM.Barsom StanleyD.Lindsey
WilliamD.Bast JamesO.Malley
ReidarBjorhovde RichardW.Marshall(deceased)
RogerL.Brockenbrough HarryW.Martin
GregoryG.Deierlein DavidL.McKenzie
DuaneS.Ellifritt DuaneK.Miller
BruceR.Ellingwood ThomasM.Murray
MichaelEngelhardt R.ShankarNair
Shu-JinFang JackE.Petersen
StevenJ.Fenves DouglasA.Rees-Evans
JohnW.Fisher RobertE.Shaw,Jr.
TimothyP.Fraser DonaldR.Sherman
TheodoreV.Galambos W.LeeShoemaker
LouisF.Geschwindner WilliamA.Thornton
LawrenceG.Griffis RaymondH.R.Tide
JohnL.Gross CynthiaJ.Duncan,Secretary
TheCommitteegratefullyacknowledgesthefollowingtaskcommitteemembersfortheir
contributiontothisdocument.
FaridAlfawakhiri ChristopherHewitt
GeorgesAxmann RonaldHiatt
JosephBohinsky KeithHjelmstad
BruceButler SocratesIoannides
CharlesCarter NestorIwankiw
RobertDexter(deceased) RichardKaehler
CarolDrucker DeanKrouse
W.SamuelEasterling BarbaraLane
MichaelEngestrom JayLarson
M.ThomasFerrell MichaelLederle
ChristopherFoley KevinLeSmith
ArvindGoverdhan J.WalterLewis
JeromeHajjar DanielLinzell
TomHarrington LeRoyLutz
JamesHarris PeterMarshall
StevenHerth BrianMeacham
ToddHelwig SaulMednick
RichardHenige JamesMilke
SpecificationforStructuralSteelBuildings,March9,2005
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HeathMitchell JamesSwanson
JeffreyPacker EmileTroup
FrederickPalmer Chia-MingUang
DhirenPanda SriramuluVinnakota
TeomanPekoz RobertWeber
CarolPivonka DonaldWhite
ClintonRex RobertWills
JohnRuddy RonaldZiemian
DavidSamuelson SergioZoruba
ThomasSchlafly
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TABLE OF CONTENTS
.SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix
.GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xliii
SPECIFICATION
A. GENERALPROVISIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
A1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1. Low-SeismicApplications.................................. 2
2. High-SeismicApplications.................................. 2
3. NuclearApplications....................................... 2
A2. ReferencedSpecifications,CodesandStandards. . . . . . . . . . . . . . . . 2
A3. Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1. StructuralSteelMaterials................................... 5
1a. ASTMDesignations ....................................... 6
1b. UnidentifiedSteel ......................................... 7
1c. RolledHeavyShapes....................................... 7
1d. Built-UpHeavyShapes..................................... 7
2. SteelCastingsandForgings................................. 7
3. Bolts,WashersandNuts.................................... 8
4. AnchorRodsandThreadedRods............................. 8
5. FillerMetalandFluxforWelding............................ 9
6. StudShearConnectors ..................................... 9
A4. StructuralDesignDrawingsandSpecifications . . . . . . . . . . . . . . . . . 9
B. DESIGNREQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
B1. GeneralProvisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
B2. LoadsandLoadCombinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
B3. DesignBasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1. RequiredStrength ......................................... 10
2. LimitStates............................................... 11
3. DesignforStrengthUsingLoadandResistanceFactorDesign
(LRFD).................................................. 11
4. DesignforStrengthUsingAllowableStrengthDesign(ASD)..... 11
5. DesignforStability........................................ 12
6. DesignofConnections ..................................... 12
6a. SimpleConnections........................................ 12
6b. MomentConnections....................................... 12
7. DesignforServiceability.................................... 12
8. DesignforPonding ........................................ 13
9. DesignforFatigue......................................... 13
10. DesignforFireConditions.................................. 13
11. DesignforCorrosionEffects ................................ 13
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12. DesignWallThicknessforHSS.............................. 13
13. GrossandNetAreaDetermination ........................... 14
B4. ClassificationofSectionsforLocalBuckling . . . . . . . . . . . . . . . . . . 14
1. UnstiffenedElements ...................................... 15
2. StiffenedElements......................................... 15
B5. Fabrication,ErectionandQualityControl . . . . . . . . . . . . . . . . . . . . 18
B6. EvaluationofExistingStructures . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C. STABILITYANALYSISANDDESIGN . . . . . . . . . . . . . . . . . . . . . . . . 19
C1. StabilityDesignRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1. GeneralRequirements...................................... 19
2. MemberStabilityDesignRequirements....................... 19
3. SystemStabilityDesignRequirements........................ 20
3a. Braced-FrameandShear-WallSystems ....................... 20
3b. Moment-FrameSystems.................................... 20
3c. GravityFramingSystems................................... 20
3d. CombinedSystems ........................................ 20
C2. CalculationofRequiredStrengths. . . . . . . . . . . . . . . . . . . . . . . . . . 20
1. MethodsofSecond-OrderAnalysis........................... 21
1a. GeneralSecond-OrderElasticAnalysis ....................... 21
1b. Second-OrderAnalysisbyAmplifiedFirst-OrderElastic
Analysis.................................................. 21
2. DesignRequirements....................................... 23
2a. DesignbySecond-OrderAnalysis............................ 23
2b. DesignbyFirst-OrderAnalysis.............................. 24
D. DESIGNOFMEMBERSFORTENSION . . . . . . . . . . . . . . . . . . . . . . 26
D1. SlendernessLimitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
D2. TensileStrength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
D3. AreaDetermination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1. GrossArea ............................................... 27
2. NetArea ................................................. 27
3. EffectiveNetArea ........................................ 28
D4. Built-UpMembers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
D5. Pin-ConnectedMembers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1. TensileStrength........................................... 28
2. DimensionalRequirements.................................. 30
D6. Eyebars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1. TensileStrength........................................... 30
2. DimensionalRequirements.................................. 30
E. DESIGNOFMEMBERSFORCOMPRESSION . . . . . . . . . . . . . . . . . 32
E1. GeneralProvisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
E2. SlendernessLimitationsandEffectiveLength . . . . . . . . . . . . . . . . . 32
E3. CompressiveStrengthforFlexuralBucklingofMemberswithout
SlenderElements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
SpecificationforStructuralSteelBuildings,March9,2005
AMERICANINSTITUTEOFSTEELCONSTRUCTION,INC.