Exercise 2 - Platform(Mg-4, Mg5=Tg1))

8/2/2019 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


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 2 Platform


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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Exercise 2 Platform


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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Exercise 2 Platform


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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Exercise 2 Platform


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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Exercise 2 Platform


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


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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Exercise 2 Platform


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


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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Exercise 2 Platform

Modul Training 19

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

Documents

Exercise 2 - Platform(Mg-4, Mg5=Tg1))