Exercise 2 - Platform(Mg-4, Mg5=Tg1))
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Transcript of Exercise 2 - Platform(Mg-4, Mg5=Tg1))
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Exercise 2 Platform
Modul Training 1Divisi Analysis Structure
Platform
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Exercise 2 Platform
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Model Description:
The platform shown below will be used simple modeling example involving beamelements. Direction of beam element is important to create accurate real model.
Standart Material Steel
Modulus of Elasticity E = 210000. N/mm2
Shear Modulus of Elasticity G = 63000. N/mm2
Poison Ratio v = 0.3
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Exercise Procedure:
1. Create a new database called platform.db
File/New...
New Database Name: platform
OK
In the New Model Preference form set the following:
Tolerance: Default
Analysis Code: MSC/NASTRAN
Analysis Type: Structural
OK
2. Create the truss geometry
Create point geometry
Geometry
Action: Create
Object: Point
Method: XYZ
Point Coordinates List : [ 0 0 0 ]
Apply
Enter the following 10 points.
[0 0 1000] Apply
[0 3000 0] Apply
[0 3000 1000] Apply
[0 1000 1000] Apply
[0 2000 1000] Apply[ [0 0 500] Apply
[0 3000 500] Apply
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Then klik show label Icon
Show Labels Icon
Create curve geometry
Geometry
Action: Create
Object: Curve
Method: Point
V Auto execute
Starting point list point 1
End point list point 7
Apply
Repeat this procedure to create the remaining lines.
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These lines will be copied in the Z direction to create the other side of the truss. Since wewill be working in 3-D for the first time, lets rotate the view so we can see the new lines
that will be generated behind the ones you just created.
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Connect corresponding points from the two sides of truss.
Geometry
Action: Create
Object: Curve
Method: Point
V Auto execute
Starting point list point 1
End point list point 11
Apply
You have completed the geometry section of this example.
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3. Create finite elements for the roof truss.
The first thing to be done is to set the mesh sizes for the curves (actually lines in this
example) to an appropriate value so it will keep the total number of nodes generated
small enough to workElement
Action: Create
Object: Mesh
Method: Curve
V Auto execute
Curve list curve 1:35
Global Edge Length
V Automatic Calculation
Value 200.
Apply
4. Create materialMaterial
Action: Create
Object: Isotropic
Method: Manual Input
Material Name
Steel click this box and enter name steel
Input Properties click this box
Constituve Model: Linear Elastic
Elastic modulus = 2.1E5
Poison Ratio = 0.3
Shear Modulus = 6.3E4
OK
Apply
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5. Create Element Properties
Create Angle profile for stay and bracket
Properties
Action: Create
Object: 1 D
Type : Beam
Property Set Name
L 90x90x9 click this box and enter name L 90x90x9
Input Properties click this box
Material Name click this boxMaterial Property set
m.steel select our material in the list box that
appears in the form
Create Section click this box
New Section Name
L 90x90x9_Y click this box and enter name L 90x90x9_Y
click this box
W 90 click this box and enter 90
H 90 click this box and enter 90
t1 9 click this box and enter 9
t2 9 click this box and enter 9
OK
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Bar Orientation < 0 1 0>
OK
Aplication Region
Select member Elm 1:10 21:24 30:45 56:59 65:80 91:94 100:105
click beam element
than select element
Add click this box
Apply
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Create Angle profile for platform
Properties
Action: Create
Object: 1 D
Type : Beam
Property Set Name
L 90x90x9_z click this box and enter name L 90x90x9_z
Input Properties click this box
Material Name click this box
Material Property set
Steel select our material in the list box that
appears in the form
Create Section click this box
[ Section name ] click this box
L 90x90x9 click this database
Bar Orientation < 0 1 0>
OK
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6. Merge coincident nodes.
Properties ( select Element in the main menu )
7. Show beam display direction check.
Display
Load/BC/Elem. Prop < pull down menu >
Beam Display: 3D:FullSpan
Apply
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7. Apply constraints to the truss.
Load/BCs
Action: Create
Object: Displacement
Type : Nodal
New Set Name
fixed click this box and enter name fixed
Input Data click this box
Translation < T1 T2 T3> < 0 ,0, 0 >
Rotations < R1 R2 R3> < 0, 0 ,0 >
OK
Select Application Region click this box
Geometry filter FEM click this box
Aplication Region
Select member Node 1 89 114 70 45 26
Add click this box
OK
Apply
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8. Apply loads to the model.
Load/BCsAction: Create
Object: Distributed Load
Type : Element Uniform
New Set Name
load_20 click this box and enter name load_20
Input Data click this box
Distr. load < f1 f2 f3> < ,-20, >
Distr. Moment < m1 m2 m3> < >
OK
Select Application Region click this box
Geometry filter FEM click this box
Aplication Region
Select member
Add click this box
OK
Apply
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9. Apply loads & boundary condition to Load case
10.Perform the Analysis
We're ready to analyze the problem we've entered in PATRAN.
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11. Accessing result form Patran
AnalysisAction: Access Result
Object: Attach XDB
Type : Result Entity
Select Result File
platform.xdb click this box and find file . xdb
Apply
12. Post Processing
Create deformation result.
Result
Action: Create
Object: Deformation
Select Result Case (s)
Load_1.Static Subcase
Select Deformation Result
Displacement,Translation
Apply
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Create stress fringe report.
Result
Action: Create
Object: Fringe
Select Result Case (s)
Load_1.Static Subcase
Select Deformation Result
Stress Tensor
Quantity : Von Mises
Apply
Pick up figure from Patran for report or presentation,
Copy to clipboard
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NOTE :
BEAM ELEMENT PROPERTIES
Bar/Beam elements require a vector to define the orientation of the cross-section (the local
element coordinate system)
In MSC.Patran, this vector is defined using either the Patran global (X,Y,Z) or a local
coordinate system
To recover bending stress, stress recovery points must be defined relative to the element
coordinate system
Called C,D,E,F for MSC.Nastran
Used to determine c in the classical equation stress= Mc/I
The moments of Inertia (I1 and I2) and the torsional constant (J) are defined with respect to
the local element coordinate system (J is not the polar moment of inertia)
MSC.Nastran and ABAQUS beam cross-section orientations are explained in the figure