hr steel design
Post on 08-Aug-2018
216 Views
Preview:
TRANSCRIPT
-
8/22/2019 Hr Steel Design
1/26
Presenter: MattBrown,P.E.
RISAWebinar
UnderstandingandOptimizingHotRolledSteelDesigninRISA
-
8/22/2019 Hr Steel Design
2/26
INTEGRATEDPROGRAMS
RISAFloor5.1
RISA3D9.1
-
8/22/2019 Hr Steel Design
3/26
AISC36005(13th EditionSteelConstructionManual)
AISCDesignGuide#9(Torsion)
AISCDesignGuide#11(Vibration)
REFERENCEDCODES
ImagescourtesyofAISC.org
http://www.aisc.org/store/p-1578-Steel-Construction-Manual-Thirteenth-Edition.aspx -
8/22/2019 Hr Steel Design
4/26
TodaysTopics
DirectAnalysisMethod
WarpingTorsion
SingleAngles
FloorVibrations
SteelJoists
OVERVIEW
-
8/22/2019 Hr Steel Design
5/26
AISCSpecificationChapterC
StabilityAnalysisandDesign
DIRECTANALYSISMETHOD
AISCSpecificationAppendix7
DirectAnalysisMethod
-
8/22/2019 Hr Steel Design
6/26
DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
-
8/22/2019 Hr Steel Design
7/26
EXAMPLEPROBLEM
CantileverColumn
W12x45
200kGravityLoad
10kLateralLoad
120Tall
-
8/22/2019 Hr Steel Design
8/26
P ANALYSIS
InitialShear: 10k
InitialMoment: (10k)*(12ft)=120ftk
InitialDeflection: =0.981
-
8/22/2019 Hr Steel Design
9/26
P ANALYSIS
BendingDeflection: =0.981
ShearDeflection: =0.035
-
8/22/2019 Hr Steel Design
10/26
P ANALYSIS
FinalShear: 11.6k
FinalMoment: 139ftk
FinalDeflection: 1.182
16%IncreaseoverFirstOrder
-
8/22/2019 Hr Steel Design
11/26
P ANALYSIS
FinalShear: 12.5k
FinalMoment: 140ftk
FinalDeflection: 1.216
-
8/22/2019 Hr Steel Design
12/26
DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
-
8/22/2019 Hr Steel Design
13/26
STIFFNESSREDUCTION
FlexuralStiffness AxialStiffness
-
8/22/2019 Hr Steel Design
14/26
DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction
(EI*,
EA*)
3. NotionalLoads
REQUIREMENTS
-
8/22/2019 Hr Steel Design
15/26
NOTIONALLOADS
PerAISCCodeofStandardPractice
ErectionToleranceforColumns
(outofplumb)=H/500
NotionalLoad(N)=P/500
P
N
-
8/22/2019 Hr Steel Design
16/26
DirectAnalysisRequirements
1. SecondOrderAnalysis(P ,P )
2. StiffnessReduction(EI*,EA*)
3. NotionalLoads
REQUIREMENTS
K=1.0
-
8/22/2019 Hr Steel Design
17/26
TraditionalDesign DirectAnalysis
M=120kft M=152kft
K=2.1 K=1.0
Reqd Shape: Reqd Shape:
W12x40 W12x45
COMPARISON
-
8/22/2019 Hr Steel Design
18/26
WarpingTorsion
affectsWideFlange
andChannelShapes
WARPINGTORSION
-
8/22/2019 Hr Steel Design
19/26
IdealizeastwoWTsections,
eachinminoraxisbending
WARPINGTORSION
-
8/22/2019 Hr Steel Design
20/26
SINGLEANGLES
GeometricBending PrincipalBending
-
8/22/2019 Hr Steel Design
21/26
FLOORVIBRATION
FloorVibrationProcedure:
1. Determinedampingweight
2. Determinebeamnaturalfrequency
3. Calculateexpectedacceleration
-
8/22/2019 Hr Steel Design
22/26
FLOORVIBRATION
DampingWeight
BeamSelfWeight
+SlabWeight
+RealisticSuperimposedLoad(11psf?)
-
8/22/2019 Hr Steel Design
23/26
FLOORVIBRATION
AllowableAcceleration
Basedon65lbexcitationforce(footfall)
0.5%gforOffices,Residences,Churches
1.5%gforShoppingMalls
-
8/22/2019 Hr Steel Design
24/26
STEELJOISTS
w P
ActualLoad
EquivalentUniformLoad
w
-
8/22/2019 Hr Steel Design
25/26
Presenter: MattBrown,P.E.
AdditionalResources AISCPublications
RISA3DHelpFile/Manual
www.risanews.com
-
8/22/2019 Hr Steel Design
26/26
ThankyouforAttending!
Questions?
Pleaseletusknowifyouhavequestions.
Wewillanswerasmanyquestionsastimepermitsduringthe
webinar.
Oncethewebinarisclosed,wewillpostallQ&As,aswellasthe
QuickReferenceGuide,toourwebsite:www.risa.com
Forfurtherinformation,contactusat:info@risatech.com
http://www.risatech.com/http://www.risatech.com/
top related