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WORKSHOP 2

Roof Truss Subjected to Point Loads(Top and bottom members welded,cross

braces are connected by pin joints)

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Roof Truss Subjected to Point Loads (cont.)

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Roof Truss Subjected to Point Loads (cont.)

Figure 1-1

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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.

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Workshop # 2 (cont.)

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Workshop # 2 (cont.)

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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.

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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 .

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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 .

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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 .

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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

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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

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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

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STEP 2B: Display the Beam cross sectional area

S 2C El P i C /1D/ B

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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

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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

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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

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STEP 3B: Display the Beam cross sectional area

Step 3C Element Properties: Create /1D/ Beam

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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

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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

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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

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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

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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

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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

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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.