Presenter:DeborahPenko,P.E.

LoadsinRISA3D

RISA3D

JointLoading DistributedLoading(akaLineLoads) PointLoading AreaLoading SurfaceLoading Plates Walls

MovingLoading AutomatedLoadsWind&Seismic

Agenda

RISA3D

GraphicalInterface Windowsmenu Insert

BasicLoadCases Allowsyoutoaccessspreadsheets

Overview

RISA3D

Spreadsheets

RISA3D

LoadCombinations

Buildyourowncombinations

EntertheLoadCategory DL,LL,WL,etc.***MustuseLoadCategories!!!

OrtheBasicLoadCase(BLC) 1referstorow1

BLC1

RISA3D

LoadCombinations

LoadCombinationcanbeNested

8BLCsperLC

CombineLCs

MixandmatchLCsandBLCs

RISA3D

LoadCombinations

OrUsetheLoadCombinationGenerator

GravityLoads WindLoads SeismicLoads

JointLoads

ApplytoanyJoint

Load GlobalAxisX,Y,Z MomentMX,MY,MZ

EnforcedDisplacement Mass DirectionalMass MassMomentofInertia

JointLoads

JointLoads

EnforcedDisplacement

DistributedLoads

DistributedLoads

ApplyDistributedLoadstoMembersorWalls

Taperloads

StartorStopanywhere

DistributedLoads

DistributedLoads

X,Y,Z GlobalAxis

x,y,z LocalAxis

Mx Torqueaboutlocalxaxis

T ThermalLoading

PX,PY,PZ ProjectedLoading

DistributedLoads

ThermalLoading

ThermalLoads effectsoftemperaturedifferentials

Causetheaxialexpansionorcontractionofthemember

AmbientTemperaturedefined:

DistributedLoads

ThermalLoading

ForExample:PreStressBraceMembers

7.5kipsTensionRequired

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!

DistributedLoads

ProjectedLoading

ProjectedLoad=AppliedLoadX(MemberLengthinHorz.Plane)ActualMemberLength

100lb/ftDistributedLoadonYAxis 100lb/ftProjectedPYLoad ConvertsLoad100lb/ft *(10ft/14.1ft)=70.71

ProjectedLoads Snowloads

PointLoads

PointLoads

X,Y,Z GlobalAxis

x,y,z LocalAxis

My,Mz Momentaboutthememberlocalaxis

Mx TorsionalMomentaboutlocalxaxis

AreaLoads

AreaLoading

Definepolygon(3or4sides) LoadsappliedtoMembers&Walls DefineOneWayorTwoWayLoadAttribution

AreaLoads

AreaLoading

AFirstClick

SecondClickB

ThirdClickC

DFourthClick

AreaLoads

AreaLoading

WhatisaTransientAreaLoad?

Letstakealookatanexamplemodel

AreaLoads

OpenStructureLoading

LoadsappliedbasedonProjectedSurfaceArea

HSS4x4x6width=4in

TransientLoad:20lbf*4/12=6.667lb/ft

Note: Bracesdontgetarealoads NoShielding

SurfaceLoading

ApplytoPlatesX,Y,Z GlobalAxis

x,y,z LocalAxis

PX,PY,PZ ProjectedLoading

T ThermalLoading

Letstakealookatanexampleofatanknow!

WallPanelLoads

WallPanelLoadingOptions SurfaceLoading

FullwallorPartial ConstantorTaperedforce

DistributedLoading

JointLoading ANYWHERE!

AreaLoading

MovingLoading

MovingLoads TwoStepProcess1. DefinetheMovingLoadPattern

2. ApplytheMovingLoad

Letstakealookatanexample!

Wind&SeismicLoading

AutomaticLoadGeneration

BuildingDesignwithRigidDiaphragms AutomatedLoads

Wind&SeismicLoading

AutomaticLoadGeneration

Presenter:DeborahPenko,P.E.

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