lab 1- truss problem - ce529a

Lab 1 - CE529a Abaqus: Truss Problem

Fabian Rojas

TA

Fall 2010

Lab 1 - CE529a - Fall 2010

TA: Fabian Rojas

Truss

Solve the Truss structure shown in the figure using Abaqus :

Lab 1 - CE529a - Fall 2010 TA: Fabian Rojas

Reaction Forces

Nodal Displacements

Elements Stresses

Esteel = 29000 Ksi

= 0.27

ACrossArea = 4 in2

US units (Kip in)

Find:

Analysis Steps 1. Start Abaqus -> New model database

2. Double click on Parts node in the model tree

3. In Create Part Select:


- 2D Planar

- Deformable

- Wire

- Approximate Size : 1000


4. Draw the geometry of the Truss

Note: After create the geometry click x


5. Double click on Materials node in the model tree

- Name the material and write a description

- Select: Mechanical -> Elasticity -> Elastic

-Define Youngs Modulus and Poissons Ratio

- Click OK


6. Double click on Sections node in the model tree

- Name the Section

- Select: Beam -> Truss

- Click Continue

-Select: Material -> Steel

- Cross-sectional area : 4

- Click OK


7. Expand the Parts node in the model tree and expand the part created, and then double click on Set

- Name the Set

- Click Continue

-Select all the elements with the same cross section

- Click Done


8. Form 1: Expand the Parts node in the model tree and expand the part created, and double click on Section Assigment

- Select Set

- Select Section -> Bar

-Click OK

- Click Dismiss

Step 8 can be done in 2 different ways


8. Form 2: Expand the Parts node in the model tree and expand the part create, and double click on Section Assigment

- Select All the elements that have the same properties

- Click Done in the prompt area

- Select Section -> Bar

-Click OK


9. Expand the Assembly node in the model tree and then double click on Instances

-Select Dependent

- Click OK


10. Double click on the Steps node in the model tree

-Name Step

-Select General -> Static, General

-Click Continue

-Give a Step Description

-Click OK


11. Expand the Field Output Requests node in the model tree and then double click on the F-Output-1

- Deselect Strains

- Deselect Contact

- Click OK


12. Double click on the BCs node in the model tree

- Name the BC

- Select : Step

- Select Mechanical

-> Displacement/ Rot

- Click Continue

- Select Node for the Pinned support and press Done in the prompt area

- Check the U1 and U2 and set them to 0


13. In the toolbox area click on the Create Boundary Condition icon

- Name the BC

- Select : Step

- Select Mechanical

-> Displacement/ Rot

- Click Continue

- Select Node for the Roller support and press Done in the prompt area

- Check the U2 and set it to 0

- Click OK


14. In the toolbox area click on the Create Load icon

- Name the Load

- Select : Step

- Select Mechanical

-> Concentrated force

- Click Continue

- Select Node for the Load and press Done in the prompt area

- Specify CF1 = -28

- Specify CF2 = -42

- Click OK


15. Expand the Parts node in the model tree and expand the part created, and double click on Mesh

- In the toolbox area click on the Seed Edge: By Number icon (hold down icon to bring up the other options)

- Select all the elements and Click Done in the prompt area

- Define the number of elements along the edges as 1

- Click enter in the prompt region, then Done in the response to the next prompt


16. In the toolbox area click on the Assign Element Type icon

- Element Library -> Standard

- Family -> Truss

- Geometric Order -> Linear

- Click OK

- Click Done in the prompt area

- Select all the elements and click Done in the prompt area


17. In the toolbox area click on the Mesh Part icon

- Click Yes in the prompt area

- In the model tree, the mesh node must be without the (empty)


18. In the menu bar select View -> Part Display Options

- Select Mesh tab

- Check Show node label

- Check Show element labels

- Click OK


19. Double click on the Jobs node in the model tree

- Name Job

- Click Continue

- Give a Description

- Click OK


20. Right click on the Jobs node in the model tree, and select Submit

- Check that there are no errors or warnings

If there errors, investigate the cause(s) and fixe them

If there warnings, investigate the cause(s)

21. Right click on the Job-Truss (Completed) and select Results


22. In the toolbox area click on the Plot Contours on Deformed Shape icon, then click on Allow Multiple Plot States and then Plot Undeformed Shape

Result Tab

We display the undeformed shape and the deformed shape with the Von Mises stress in the elements


23. To modify some properties of the view display you need to click in the menu bar View -> Graphics Options

To modify the plot you need to go to the tool box area and click in the Common Plot Options icon


24. In the toolbox area click on the Plot Contours on Deformed Shape icon and hold down icon to bring up the other options, and select Plot Contours on Undeformed Shape. Select Contour Options icon

- Check Show tick marks for line elements

- Click OK


25. In the menu bar select Result -> Options

- Set to 0 the Averaging threshold

- Click OK


In the menu bar : Result -> Field Output

You can change the output that you want to analysis


26. In the menu bar select Tools -> Query and then Select in Query -> Probe values

- Select Probe: Elements

- In the viewport put the mouse over any element and you will see the field output for the element selected

Note: This is an option to obtain the values of the field output on screen


27. To create a text file (Report) with the results: In the menu bar click on Report -> Field Output

- Select Position -> Unique Nodal

- Check RF -> RF1, RF2

- Check U -> U1, U2

- Select Setup tab

- Name the report

- Click Apply


- Select Variable tab

- Deselect RF

- Deselect U

- Select Position -> Element Nodal

- Select S -> S11

- Click Apply

- Select Position -> Integration Point

- Click OK


28. Open the file Truss.rpt ( c:\temp\Truss.rpt ), it is a TXT file

**************************************************************

Field Output Report, written Wed Sep 09 15:13:20 2009

Source 1

---------

ODB: C:/Temp/Job-Truss.odb

Step: Apply_Load

Frame: Increment 1: Step Time = 1.000

Loc 1 : Nodal values from source 1

Output sorted by column "Node Label.

Field Output reported at nodes for part: TRUSS-1

Node RF.RF1 RF.RF2 U.U1 U.U2

Label @Loc 1 @Loc 1 @Loc 1 @Loc 1

---------------------------------------------------------------------------------

1 0. 0. 12.4138E-03 -113.054E-03

2 28. 34. -28.E-36 -34.E-36

3 0. 0. -85.9112E-03 -113.054E-03

4 0. 8. 21.7241E-03 -8.E-36

Minimum 0. 0. -85.9112E-03 -113.054E-03

At Node 4 3 3 3

Maximum 28. 34. 21.7241E-03 -8.E-36

At Node 2 2 4 4

Total 28. 42. -51.7732E-03 -226.108E-03

*********************************************************

Field Output Report, written Wed Sep 09 15:21:09 2009

Source 1

---------

ODB: C:/Temp/Job-Truss.odb

Step: Apply_Load

Frame: Increment 1: Step Time = 1.000

Loc 1 : Integration point values from source 1

Output sorted by column "Element Label.

Field Output reported at integration points for part: TRUSS-1

Element Int S.S11

Label Pt @Loc 1

-------------------------------------------------

1 1 1.5

2 1 -12.0208

3 1 1.5

4 1 -2.5

5 1 3.14419E-15

Minimum -12.0208

At Element 2

Int Pt 1

Maximum 1.5

At Element 3

Int Pt 1

Total -11.5208

Questions ?


lab 1- truss problem - ce529a

Documents

fabian rojas trusssolve

ce529a abaqus

parts node

steps node

node f

materials node

sections node

bcs node