8/13/2019 NAS101 W2.pdf
1/25
Workshop 2-1NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
WORKSHOP 2
Roof Truss Subjected to Point Loads(Top and bottom members welded,cross
braces are connected by pin joints)
8/13/2019 NAS101 W2.pdf
2/25
Workshop 2-2NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Roof Truss Subjected to Point Loads (cont.)
8/13/2019 NAS101 W2.pdf
3/25
Workshop 2-3NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Roof Truss Subjected to Point Loads (cont.)
Figure 1-1
8/13/2019 NAS101 W2.pdf
4/25
Workshop 2-4NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Workshop # 2 (cont.)
1. Model descriptiona. Simply supported at left end, roller at right end.b. Treat it as two dimensional structure.c. Apply point loads at grid points 2,4, and 6 as shown in Figure 2-1.
d. Top (1,2,3,4) and bottom (9,10,11) are steel members and arewelded together.e. Cross braces are made of wood and are connected with pin
joints.f. See Table 2-1 for element properties.
g. See Table 2-2 for material properties.h. See Table 2-3 for cross-sectional properties.
8/13/2019 NAS101 W2.pdf
5/25
Workshop 2-5NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Workshop # 2 (cont.)
8/13/2019 NAS101 W2.pdf
6/25
Workshop 2-6NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Workshop # 2 (cont.)
8/13/2019 NAS101 W2.pdf
7/25Workshop 2-7NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Suggested Exercise Steps:
1. Copy previous PATRAN workshop db file:w1.db toanother name called w2.db
2. Open the PATRAN database and bring in the w2.db3. Create new material properties for steel and for pine4.
Create properties for BAR elements.5. Create sectional properties using beam library6. Redefine the elements of 1,2,3,4 and 9,10,11 as the
bar elements.
7. Apply loads and boundary conditions to the model.8. Submit the model to MSC.Nastran for analysis.9. Post-Process results using MSC.Patran.
8/13/2019 NAS101 W2.pdf
8/25Workshop 2-8NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 1. Material: Create /Isotropic/ Manual Input
Create the material pine.a. Create / Isotropic / Manual
Input.b. Type in pine for the Material
Name.c. Click on the Input Properties
button to bring up the InputOption window.(see table2-2)
d. Enter 1.76E6 for the ElasticModulus ,and put in value fordensity, thermal coefficient ofexpansion ,and referencedtemperature.
e. Click OK to return to the mainmaterial menu.
f. Click Apply .
8/13/2019 NAS101 W2.pdf
9/25Workshop 2-9NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 1A. Material: Create /Isotropic/ Manual Input/Failure
Create the failure limit.a. Click on the Input Properties
againb. Click on the Constitutive
Model changed to Failurebutton to bring up the InputOption window.
c. Enter 1900 for the Tension
Stress limitd. Enter 1900 for the compression
stress limite. Click OK to return to the main
material menu.f. Click Apply .
8/13/2019 NAS101 W2.pdf
10/25Workshop 2-10NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 1B. Material: Create /Isotropic/ Manual Input
Create the material steel.a. Create / Isotropic / Manual
Input.b. Type in steel for the Material
Name.c. Click on the Input Properties
button to bring up the InputOption window.(see table2-2)
d. Enter 2.90E7 for the ElasticModulus ,and 0.32 for Poissonratio. Also put in values fordensity, thermal coefficient ofexpansion ,and referencedtemperature.
e. Click OK to return to the mainmaterial menu.
f. Click Apply .
8/13/2019 NAS101 W2.pdf
11/25Workshop 2-11NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 1C. Material: Create /Isotropic/ Manual Input/Failure
Create the failure limit.a. Click on the Input Properties
againb. Click on the Constitutive
Model changed to Failurebutton to bring up the InputOption window.
c. Enter 24000 for the Tension
Stress limitd. Enter 24000 for the
compression stress limite. Enter 24000 for the shear stress
limitf. Click OK to return to the main
material menu.g. Click Apply .
l
8/13/2019 NAS101 W2.pdf
12/25Workshop 2-12NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 2. Element Properties: Create /1D/ Beam
Create the element properties.a. Create / 1D / Beam.b. Enter steel_a as the Property
Set Name.c. Click on the Input Properties
button.d. Click on the steel in the
Material field on the bottom
section of the Input Propertieswindow.
e. Put the cursor in the [SectionName] and click on the BeamLibrary,the window pop up isshown on next page
S 2A B lib C /S d d Sh /NASTRAN d d
8/13/2019 NAS101 W2.pdf
13/25Workshop 2-13NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 2A. Beam library: Create /Standard Shape/NASTRAN standard
Create the beam cross sectionalusing IBEAM .
a. Enter section_a as theSection Set Name.
b. Click on Ibeam button.c. Input H,W1,W2,t,t1,t2 asd. 8,3,3,0.5,0.5,0.5e. Click on Calculate/Display,
then you will see the followingsection diagram on the nextpage
f. Click OK
STEP 2B Di l h B i l
8/13/2019 NAS101 W2.pdf
14/25Workshop 2-14NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
STEP 2B: Display the Beam cross sectional area
S 2C El P i C /1D/ B
8/13/2019 NAS101 W2.pdf
15/25Workshop 2-15NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 2C. Element Properties: Create /1D/ Beam
Once the section is created,you cango back to the previous menu.
a. Once you have createdsection_a , then you canselect the Bar Orientation as, click OK
b. Click inside the box SelectMembers ,and pick element9:11
c. Click Add and APPLY toclose the form
You will see a warningmessage regarding
overwriting the properties for element9,select YES for ALL
button
St 3 El t P ti C t /1D/ B
8/13/2019 NAS101 W2.pdf
16/25Workshop 2-16
NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 3. Element Properties: Create /1D/ Beam
Create the element properties.a. Create / 1D / Beam.b. Enter steel_b as the Property
Set Name.c. Click on the Input Properties
button.d. Click on the steel in the
Material field on the bottom
section of the Input Propertieswindow.
e. Put the cursor in the [SectionName] and click on the BeamLibrary,the window pop up isshown on next page
St 3A B lib C t /St d d Sh /NASTRAN t d d
8/13/2019 NAS101 W2.pdf
17/25Workshop 2-17
NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 3A. Beam library: Create /Standard Shape/NASTRAN standard
Create the beam cross sectionalusing IBEAM .
a. Enter section_b as theSection Set Name.
b. Click on Ibeam button.c. Input H,W1,W2,t,t1,t2 asd. 6,3,3,0.5,0.5,0.5e. Click on Calculate/Display,
then you will see the followingsection diagram on the nextpage
f. Click OK
STEP 3B: Displa the Beam cross sectional area
8/13/2019 NAS101 W2.pdf
18/25Workshop 2-18
NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
STEP 3B: Display the Beam cross sectional area
Step 3C Element Properties: Create /1D/ Beam
8/13/2019 NAS101 W2.pdf
19/25Workshop 2-19
NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 3C. Element Properties: Create /1D/ Beam
Create the element properties.a. Once you have created
section_b , then you canselect the Bar Orientation as, click OK
b. Click inside the box SelectMembers ,and pick element9:11
c. Click Add and APPLY toclose the form
You will see a warningmessage regarding overwriting
the properties for element1,select YES for ALL button
Step 3D Element Properties: Modify /1D/ Rod
8/13/2019 NAS101 W2.pdf
20/25Workshop 2-20
NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 3D. Element Properties: Modify /1D/ Rod
Modify-1D-Roda. Click on rodb. Click on Modify Properties
button, and select Materialpine
c. Click OK,and APPLY
Step 4A Loads/BCs: Modify/ Displacement/Nodal
8/13/2019 NAS101 W2.pdf
21/25
Workshop 2-21NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 4A. Loads/BCs: Modify/ Displacement/Nodal
Modified the boundarycondition for the model.a. Modified / Displacement
/ Nodal.b. Click on dof456c. Click on the Modify
Data .d. Enter for the
Rotations field.
e. Click OK .f. Click on Modify
Appl ication Regionbutton .
g. Select FEM as thegeometry filter..
h. Select Node 1:7 (all t henodes) for the
Application Region.
i. Click Add . j. Click OK .k. Click Apply .
Because we have bar elements inthis model, and therefore we haveto allow the bending in this model by removing rotation in Z from
previous pin model.
Step 4B (cont ) Loads/BCs: Create Boundary Conditions
8/13/2019 NAS101 W2.pdf
22/25
Workshop 2-22NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 4B.(cont.) Loads/BCs: Create Boundary Conditions
After you have completedprevious steps,then you see theconstraints on the model asshown below:
Step 5 Analysis: Analyze/ Entire Model/Full Run
8/13/2019 NAS101 W2.pdf
23/25
Workshop 2-23NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 5. Analysis: Analyze/ Entire Model/Full Run
Submit the model for analysis.a. Analyze / Entire Model / Full
Run.b. Click on the Solution Type .c. Select LINEAR STATIC as the
Solution Type.d. Click OK .e. Click Apply .
Step 6 Analysis : Attach XDB/ Resul t Entities/ Local
8/13/2019 NAS101 W2.pdf
24/25
Workshop 2-24NAS101 WorkshopsCopyright 2001 MSC.Software Corporation
Step 6. Analysis : Attach XDB/ Resul t Entities/ Local
Attach the XDB result file.a. Attach XDB / Result Entities /
Local.b. Click on Select Result File .c. Select the file called w2.xdbd. Click OK .e. Click Apply .
Step 7 (cont ) Resul ts: Create/Quick Plot
8/13/2019 NAS101 W2.pdf
25/25
NAS101 Workshops
Step 7 (cont.) Resul ts: Create/Quick Plot
Create a Quick Plot of the results.a. Create / Quick Plot.b. Select SC1 result case.c. Select Displacement,
Translational for theDeformation Result.
d. Click Apply .
Note: MaximumDeformation is 7.06E-2.
These information appearat the lower right handcorner of the plot.