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HSSDesignwiththeLatestCodesandMaterialSpecifications
KimberleyOlson,PETechnicalConsultanttotheSteel
TubeInstitute
Topics
UsesMaterialsAvailabilityConnections
Structuralmembershavebeenaroundforcenturies.Theyvebeenusedasflexuralloadcarryingmembersascolumnsandbeamsinhutsandhousingandforscaffolding.
Galileostudiedstructuralmembersinthe15thcentury.Hecalledthemhollowsolidsandanalyzedspecificexamplesfromnature thestemsofflowersthebonesofanimalsbamboostructuralmemberswhicharelightweightandflexible,yetstrong.
History
Compression
Noweakaxis greatforcolumns
Torsion
TorsionalconstantofanHSSis200timesthatofanopensection
HSS Wide Flange
Torsion
TorsionExample:Beamlength30torsionalload1.2ftk/ft
W18x35=2.41rad
HSS12x6x5/16=0.0063rad
BlastLoading
HSSaregoodblastresistantmembers directionofloading highertorsionalrigidity compositeHSSmembers
ManufacturingProcess
Twoprocesses: ElectricResistanceWelding(ERW) Weld Round,Form SquareProcess(continuousforming)
Form Square,Weld SquareProcess(directforming)
SubmergedArcWelding(SAW)
ManufacturingProcess
Allstartswhensteelcoilsaresplitintoproperwidths
Weld Round,Form Square
Form Square,Weld Square
SubmergedArcWelding
HSSMaterials
A500A1085A1065A847A53A252
hasbeenaroundsincethelate70s
ASTMA500
ExcerptfromASTMA50013
ASTMA500
The0.93ReductionSpec Design wall thickness
Supporting Manual Designation Comments
1989 ASD (1) tnom 9th Ed. ASD TS
1986 LRFD tnom 1st Ed. LRFD TS
1993 LRFD (2) tnom 2nd Ed. LRFD TS
1997 HSS (LRFD) 0.93 x tnom (3) NA (4) HSS
Supplement to the 1993 LRFD Spec.
1999 LRFD (2) 0.93 x tnom (3) 3rd Ed. LRFD HSS
2000 HSS (LRFD) 0.93 x tnom (3) 3
rd Ed. LRFD HSS Supplement to the 1999 LRFD Spec.
2005 (AISC 360-05)
ERW: 0.93 x tnomSAW: tnom 13
th Ed. HSS
2010 (AISC 360-10)
ERW: 0.93 x tnomSAW: tnom 14
th Ed. HSS
2016 (AISC 360-16)
A500: 0.93 x tnomA1085*: tnom 15
th Ed. HSS * also includes A1065
Notes:(1) Includes previous ASD specifications and Manuals. HSS was not specifically covered in all of these specifications or manuals (2) The reduction is included by using the appropriate separate HSS Specification(3) Applies when the actual thickness of the wall is not known(4) This specification never appeared in the Manual of Steel Construction but it did appear in the HSS Connections Manual.
ASTMA1085
YieldStrengthWallThickness
tolerance&Masstolerance
CornerRadius
A500
holdon,ihavetolookitup
rangesfrom3350ksi
10%nomasstolerance
0.41.8t 3t
The0.93Reduction
ASTMA1085 0.93factornotrequired!! NotinAISC360yetbuthasbeenpublishedinModernSteel
AISC36016draftincludesA1085anddoesnotrequirethicknessreduction
StrengthComparisonCompressivestrength:HSS6x6x3/8,kL=14
A500GrB A1085
Fy =46ksi Fy =50ksi
Pn =153k Pn =172k
0.93xtnom tnom
12%increase
ASTMA1085Ry valueswillgodown
Ry =actualyieldspecdminyield
ASTMA1085Steelsforuseinprimarybridgemembersarerequiredtohavesufficientfracturetoughnesstoreducetheprobabilityofbrittlefailureinthepresenceofafatiguecrackorothernotchlikedefect.CVNtestrequirement
Abilityofamaterialtoresistfractureunderimpactloading
Measuresabsorbedenergyduringfracture CutVinsteelandhitwithapendulum,measurehowfarthependulumswingsup
Amountofenergyabsorbedwillincreaseastemperatureincreases
ASTMA1085AASHTOdividesUSintothreetemperaturezonesforspecifyingfracturetoughness.Delineatedbylowestanticipatedservicetemperature
A1065SAWmanufacturingprocess
onlyrectangular/squaresections
taperedsections
largersections(perimetergreaterthan64andupto1thick)
noreductionindesignthickness
A500GrBvsGrCSmackdown
DUALCERT!!!AlwaysspecifyGradeC!
TheSeamWeldPerA500,Thelongitudinalbuttjointofweldedtubingshallbeweldedacrossitsthicknessinsuchamannerthatthestructuraldesignstrengthofthetubingsectionisassured
A50013addsthattheweldseamshallnotbeplacedwithintheradius
ASTMA53
Atruepipespecification,intendedformechanicalandpressureapplications(steam,water,air,gas).NotrecommendedbySTI.
Availability
ConnectionsProgram WF bm to
HSS colHSS Col splices
HSS Col base plate
HSS vert bracing
HSS to HSS (truss)
Mitered Knee / End pl
Integration
Enercalc X None
DESCON X X None
Fastrak Connection
X Fastrak
LIMCON X X X X X None
RAM Connection
X X X X RSS, RE, STAAD
RISA Connection
X X RISAFloor & RISA-3D
SDS/2 Connect
X X X X REVIT 2014 add-in
STIs HSS Connex Online
None checks HSS support only
TEDDS X None STI development
Connections TEDDS
Connections TEDDS
Connections Excel
SinglePlateShearConnectionofWFBeamtoHSSColumnMomentConnectionofWFBeamtoHSSColumn ContinuousBeamoverColumn ThroughPlate DirectlyWelded
TrussConnection KConnection T/YConnection
Connections Excel
Connections HSSConnexOnline
ProprietaryConnections
Sideplate ConXtech
ProprietaryConnections
CastConnexHolloBolt*by
Lindapter,BlindBolt,BoxBoltbyLNA*
Resources
AISCManual&DesignGuide24 CIDECTDesignGuides HollowStructuralSectionConnectionandTrusses byJ.A.Packer&J.E.Henderson
STIsContactpage ComingQ1/2015STIProductManual
Thankyou!!
KimOlson,PE303.720.4076