loads in risa-3d webinar
DESCRIPTION
Manual RISA 3DTRANSCRIPT
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Presenter:DeborahPenko,P.E.
LoadsinRISA3D
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RISA3D
JointLoading DistributedLoading(akaLineLoads) PointLoading AreaLoading SurfaceLoading Plates Walls
MovingLoading AutomatedLoadsWind&Seismic
Agenda
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RISA3D
GraphicalInterface Windowsmenu Insert
BasicLoadCases Allowsyoutoaccessspreadsheets
Overview
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RISA3D
Spreadsheets
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RISA3D
LoadCombinations
Buildyourowncombinations
EntertheLoadCategory DL,LL,WL,etc.***MustuseLoadCategories!!!
OrtheBasicLoadCase(BLC) 1referstorow1
BLC1
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RISA3D
LoadCombinations
LoadCombinationcanbeNested
8BLCsperLC
CombineLCs
MixandmatchLCsandBLCs
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RISA3D
LoadCombinations
OrUsetheLoadCombinationGenerator
GravityLoads WindLoads SeismicLoads
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JointLoads
ApplytoanyJoint
Load GlobalAxisX,Y,Z MomentMX,MY,MZ
EnforcedDisplacement Mass DirectionalMass MassMomentofInertia
JointLoads
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JointLoads
EnforcedDisplacement
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DistributedLoads
DistributedLoads
ApplyDistributedLoadstoMembersorWalls
Taperloads
StartorStopanywhere
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DistributedLoads
DistributedLoads
X,Y,Z GlobalAxis
x,y,z LocalAxis
Mx Torqueaboutlocalxaxis
T ThermalLoading
PX,PY,PZ ProjectedLoading
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DistributedLoads
ThermalLoading
ThermalLoads effectsoftemperaturedifferentials
Causetheaxialexpansionorcontractionofthemember
AmbientTemperaturedefined:
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DistributedLoads
ThermalLoading
ForExample:PreStressBraceMembers
7.5kipsTensionRequired
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DistributedLoads
ThermalLoading
Ft=A*E* *T
Reorganized: T=Ft/(A*E*)Ft=CalculatedThermalforce
Ft=7.5kips
A=MemberCrossSectionalAreaA=0.785in2
E=ElasticModulusE=29000ksi
=Coeff.ofThermalExpansion =.0000065
Therefore:T=StressInducingTemperature
=50Letsseethismodelnow!
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DistributedLoads
ProjectedLoading
ProjectedLoad=AppliedLoadX(MemberLengthinHorz.Plane)ActualMemberLength
100lb/ftDistributedLoadonYAxis 100lb/ftProjectedPYLoad ConvertsLoad100lb/ft *(10ft/14.1ft)=70.71
ProjectedLoads Snowloads
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PointLoads
PointLoads
X,Y,Z GlobalAxis
x,y,z LocalAxis
My,Mz Momentaboutthememberlocalaxis
Mx TorsionalMomentaboutlocalxaxis
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AreaLoads
AreaLoading
Definepolygon(3or4sides) LoadsappliedtoMembers&Walls DefineOneWayorTwoWayLoadAttribution
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AreaLoads
AreaLoading
AFirstClick
SecondClickB
ThirdClickC
DFourthClick
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AreaLoads
AreaLoading
WhatisaTransientAreaLoad?
Letstakealookatanexamplemodel
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AreaLoads
OpenStructureLoading
LoadsappliedbasedonProjectedSurfaceArea
HSS4x4x6width=4in
TransientLoad:20lbf*4/12=6.667lb/ft
Note: Bracesdontgetarealoads NoShielding
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SurfaceLoading
ApplytoPlatesX,Y,Z GlobalAxis
x,y,z LocalAxis
PX,PY,PZ ProjectedLoading
T ThermalLoading
Letstakealookatanexampleofatanknow!
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WallPanelLoads
WallPanelLoadingOptions SurfaceLoading
FullwallorPartial ConstantorTaperedforce
DistributedLoading
JointLoading ANYWHERE!
AreaLoading
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MovingLoading
MovingLoads TwoStepProcess1. DefinetheMovingLoadPattern
2. ApplytheMovingLoad
Letstakealookatanexample!
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Wind&SeismicLoading
AutomaticLoadGeneration
BuildingDesignwithRigidDiaphragms AutomatedLoads
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Wind&SeismicLoading
AutomaticLoadGeneration
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Presenter:DeborahPenko,P.E.
Pleaseletusknowifyouhavequestions.
Wewillanswerasmanyquestionsastimepermitsduringthewebinar.
Oncethewebinarisclosed,wewillpostallQ&Astoourwebsite:www.risa.com
Forfurtherinformation,contactusat:[email protected]
Questions?