Loads in RISA 3D

1 Presenter: Deborah Penko, in RISA 3 DRISA 3D Joint Loading Distributed Loading (aka Line Loads ) Point Loading Area Loading Surface Loading Plates Walls Moving Loading Automated Loads Wind & SeismicAgendaRISA 3D Graphical Interface Windows menu Insert Basic Load Cases Allows you to access spreadsheetsOverviewRISA 3 DSpreadsheetsRISA 3 DLoad Combinations Build your own combinations Enter the Load Category DL, LL, WL, etc.** Must use Load Categories!!! Or the Basic Load Case (BLC) 1 refers to row 1 BLC 1 RISA 3 DLoad Combinations Load Combination can be Nested 8 BLC s per LC Combine LC s Mix and match LC s and BLC sRISA 3 DLoad Combinations Or Use the Load Combination GeneratorGravity LoadsWind LoadsSeismic LoadsJoint LoadsApply to any Joint Load Global Axis X, Y, Z Moment MX, MY.

2 MZ Enforced Displacement Mass Directional Mass Mass Moment of InertiaJoint LoadsJoint LoadsEnforced DisplacementDistributed LoadsDistributed Loads Apply Distributed Loads to Members or Walls Taper Loads Start or Stop anywhereDistributed LoadsDistributed LoadsX, Y, ZGlobal Axisx, y, zLocal AxisMxTorque about local x axisTThermal LoadingPX, PY, PZProjected LoadingDistributed LoadsThermal Loading Thermal Loads effects of temperature differentials Cause the axial expansion or contraction of the memberAmbient Temperature defined:Distributed LoadsThermal LoadingFor Example: Pre Stress Brace kips Tension RequiredDistributed LoadsThermal LoadingFt = A * E* * TRe organized: T = Ft/ (A * E* )Ft= Calculated Thermal force Ft= kipsA = Member Cross Sectional AreaA = in2E = Elastic ModulusE = 29000ksi = Coeff.

3 Of Thermal Expansion = .0000065 Therefore: T = Stress Inducing Temperature= 50 Let s see this model now!Distributed LoadsProjected LoadingProjected Load = Applied Load X (Member Length in Horz. Plane)Actual Member Length100 lb/ft Distributed Load on Y Axis100 lb/ft Projected PY Load Converts Load 100lb/ft * (10 )= Projected Loads Snow loadsPoint LoadsPoint LoadsX, Y, ZGlobal Axisx, y, zLocal AxisMy, MzMoment about the member local axisMxTorsional Moment about local x axisArea LoadsArea Loading Define polygon (3 or 4 sides)

4 Loads applied to Members & Walls Define One Way or Two Way Load AttributionArea LoadsArea LoadingAFirst ClickSecond ClickBThird ClickCDFourth ClickArea LoadsArea Loading What is a Transient Area Load?Let s take a look at an example LoadsOpen Structure LoadingLoads applied based on Projected Surface AreaHSS4x4x6width = 4inTransient Load: 20lbf * 4 /12 = lb/ftNote: Braces don t get area Loads No Shielding Surface LoadingApply to PlatesX, Y, ZGlobal Axisx, y, zLocal AxisPX, PY, PZProjected LoadingTThermal LoadingLet s take a look at an example of a tank now!

5 Wall Panel LoadsWall Panel Loading Options Surface Loading Full wall or Partial Constant or Tapered force Distributed Loading Joint Loading ANYWHERE! Area LoadingMoving LoadingMoving Loads Two Step Process1. Define the Moving Load Pattern2. Apply the Moving LoadLet s take a look at an example!Wind & Seismic LoadingAutomatic Load Generation Building Design with Rigid Diaphragms Automated LoadsWind & Seismic LoadingAutomatic Load GenerationPresenter: Deborah Penko, let us know if you have will answer as many questions as time permits during the webinar.

6 Once the webinar is closed, we will post all Q&A s to our website: further information, contact us at.