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8/22/2019 Hr Steel Design
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Presenter: MattBrown,P.E.
RISAWebinar
UnderstandingandOptimizingHotRolledSteelDesigninRISA
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INTEGRATEDPROGRAMS
RISAFloor5.1
RISA3D9.1
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AISC36005(13th EditionSteelConstructionManual)
AISCDesignGuide#9(Torsion)
AISCDesignGuide#11(Vibration)
REFERENCEDCODES
ImagescourtesyofAISC.org
http://www.aisc.org/store/p-1578-Steel-Construction-Manual-Thirteenth-Edition.aspx8/22/2019 Hr Steel Design
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TodaysTopics
DirectAnalysisMethod
WarpingTorsion
SingleAngles
FloorVibrations
SteelJoists
OVERVIEW
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AISCSpecificationChapterC
StabilityAnalysisandDesign
DIRECTANALYSISMETHOD
AISCSpecificationAppendix7
DirectAnalysisMethod
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DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
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EXAMPLEPROBLEM
CantileverColumn
W12x45
200kGravityLoad
10kLateralLoad
120Tall
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P ANALYSIS
InitialShear: 10k
InitialMoment: (10k)*(12ft)=120ftk
InitialDeflection: =0.981
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P ANALYSIS
BendingDeflection: =0.981
ShearDeflection: =0.035
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P ANALYSIS
FinalShear: 11.6k
FinalMoment: 139ftk
FinalDeflection: 1.182
16%IncreaseoverFirstOrder
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P ANALYSIS
FinalShear: 12.5k
FinalMoment: 140ftk
FinalDeflection: 1.216
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DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
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STIFFNESSREDUCTION
FlexuralStiffness AxialStiffness
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DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
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NOTIONALLOADS
PerAISCCodeofStandardPractice
ErectionToleranceforColumns
(outofplumb)=H/500
NotionalLoad(N)=P/500
P
N
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DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction(EI*,EA*)
3. NotionalLoads
REQUIREMENTS
K=1.0
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TraditionalDesign DirectAnalysis
M=120kft M=152kft
K=2.1 K=1.0
Reqd Shape: Reqd Shape:
W12x40 W12x45
COMPARISON
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WarpingTorsion
affectsWideFlange
andChannelShapes
WARPINGTORSION
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IdealizeastwoWTsections,
eachinminoraxisbending
WARPINGTORSION
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SINGLEANGLES
GeometricBending PrincipalBending
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FLOORVIBRATION
FloorVibrationProcedure:
1. Determinedampingweight
2. Determinebeamnaturalfrequency
3. Calculateexpectedacceleration
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FLOORVIBRATION
DampingWeight
BeamSelfWeight
+SlabWeight
+RealisticSuperimposedLoad(11psf?)
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FLOORVIBRATION
AllowableAcceleration
Basedon65lbexcitationforce(footfall)
0.5%gforOffices,Residences,Churches
1.5%gforShoppingMalls
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STEELJOISTS
w P
ActualLoad
EquivalentUniformLoad
w
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Presenter: MattBrown,P.E.
AdditionalResources AISCPublications
RISA3DHelpFile/Manual
www.risanews.com
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ThankyouforAttending!
Questions?
Pleaseletusknowifyouhavequestions.
Wewillanswerasmanyquestionsastimepermitsduringthe
webinar.
Oncethewebinarisclosed,wewillpostallQ&As,aswellasthe
QuickReferenceGuide,toourwebsite:www.risa.com
Forfurtherinformation,contactusat:[email protected]
http://www.risatech.com/http://www.risatech.com/