Introductory Training in Midas GTS NX

8/10/2019 Introductory Training in Midas GTS NX

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Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

GTS NX Basic Training


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Geometrical Modeling inmidas GTS NX


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Objectives

Element definition

Geometry Commands

Meshing Commands


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Pointand Curve

Surface and Solid

BooleanDivide

ProtudeTransform

Sub Shape

Remove

Tools

SelectionFilter

WorkTree

Properties

Output Window

Units

Views


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drawing methods (button)

coordinate/value input

selected

wait forselection

preview

value input


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select/unselect

selection method

selection filter


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Dividing ToolsA Selected Surface divides the selected solids.Selected Tool SurfaceSelect a Tool Surface (Datum Plane, Shell, Face), which will divide the solids. If the ToolSurface consists of multiple Faces, user must combine them together and select here asa single Shell.3-Pt Plane3-Pt Plane defines an infinite plane, which will divide the selected solids. Thecoordinates of the 3 points may be specified using Snap.Divide Touching Faces of NeighborsWhen a number of solids exist in a compound and only selective solids need to bedivided, the neighboring solids to the selected solids will be divided at thecorresponding face as well. This is intended to ensure the connectivity of mesh at

thecorresponding faces.Delete Original Shape(s)This option deletes Source Shape leaving the shapes subsequent to a division operation.Delete Tool Shape(s)This option deletes Tool Surface leaving the shapes subsequent to a division operation.


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Select Master Object

Select an object Solid. Here, the Selection Filter is fixed toShape, and only Solid can be selected.Select Tool ObjectSelect a solid, which will become embedded into the objectsolid. Here, the Selection Filter is fixed to Shape, and onlySolid can be selected.Delete Original Shape(s)

Delete the Original Shapes of Master Object and leave onlythe shape subsequent to an Embed operation.


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Meshing in midas GTS NX


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Geometry > Protrude > Extrude

(Profile: 3 top Edges of Left Bottom)

Filter: EDGE

8 Extrude a new edge to further shape of the tunnel exit

9 Geometry > Divide > SolidSolid divided in 2 halves

Top and bottom halves


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Geometry > Protrude > Extrude

(Profile: 4 tunnel surfaces)

Filter: FACE

11 Extrude the 2D tunnel profiles to create the tunnel tubes

Target Objects: 4 tunnel

surfaces from works tree

Y - Axis

Geometry > Divide > Solid(Target Solids: 1 ground, 2 Exits)

Tools: 42 tunnel tubes surfaces

Select the 4 tunnel solid extrusions to get all

the 42 surfaces

12 Divide the 2 exits and ground by the 4 tunneltubes


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Move work plane to create 2D rectangle14

Geometry > Move Work Plane > Three

Point Reference

- Select 3 corner points on the back face of

the ground

Point 1

Point 3Point 2


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Method: Copy

Distance: -10

Times: 5

15 Geometry > Point & Curve > Rectangle

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Y - Axis


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17 Geometry > Divide > Solid

Target Solids : 4 tunnel tube solids

Tools: 6 rectangle surfaces

Divide touching faces: ground


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18 Tools > Geometry > Random Color

19 Mesh > Size Control > Edge > Interval Length

Mesh > Size Control > Edge > Linear Grading


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20 Mesh > Material > Create > Isotropic

Material 1: Concrete

-Model Type : Elastic

Material 2: Ground

-Model Type : Mohr - Coulomb


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21 Mesh > Property > Create > 3D

Name: Concrete

-Material : Concrete

Name: Ground

-Material : Ground


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22 Mesh > Generate > 3D > Auto-Solid


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23Mesh > Element > Parameters > 3D

Change the material property for the 2 exit structures

- Select both mesh sets from the works tree


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24 Works Tree > Model > Properties

Change the name of the mesh sets for the 2 exits and the ground.

Double click on mesh set and in property window assign names


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25 Static / Slope Analysis > Load > Self Weight

Define Gravity in the Negative Z direction


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26 Static / Slope Analysis > Boundary > Constraint > Auto

Apply Auto boundary conditions

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27 Analysis > Analysis Case > General

Name: Linear Static

Solution Type : Linear Static

- Press >> to activate all sets

- Click Apply

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28 Analysis > Analysis Case > General

Name: Linear Static After Excavation

Solution Type : Linear Static

- Drag and drop the mesh sets to only have the ground and tunnel exits active

Press Output Control

-Activate Strain Results

T i i C


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29 Analysis > Analysis > Perform

Select both Cases and click OK


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32 Works Tree > Results

Click on Linear Static After Excavation > Solid Strains > EMax Shear

-This activates the maximum shear strains

T i i C


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Thank you

Documents

Introductory Training in Midas GTS NX