Basic Tutorial 4 - 2D Analysis of Stage Constructed Embankment.pdf
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Transcript of Basic Tutorial 4 - 2D Analysis of Stage Constructed Embankment.pdf
1
Basic Tutorial 4
2D Analysis of Stage Constructed Embankment
GTS Basic Tutorial 4.
2D Analysis of Stage Constructed Embankment
Contents
Starting GTS 1
Create Analysis Data 4
Attribute 4
2D Geometry Modeling 11
Rectangle, Polyline and Line 11
Intersect 13
2D Mesh Generation 14
Size Control 14
Map Mesh k-Edge Area 18
Analysis 22
Load 22
Apply uniform pressure load on top of embankment. 22
Support 24
Define Construction Stage 25
Solve 30
Post Processing, Result Display and Control 31
Displacement Contour 32
Stress Contour 35
GTS Basic Tutorial 4
1
GTS Basic Tutorial 4
In this tutorial we will model a two dimensional embankment and analyze with construction
stages. Then we will mesh the embankment with 4-node tetrahedral elements for analysis.
We will learn how to apply the load and how to define each construction stage. After
performing analysis, we will display the output in the form of p-q Diagrams and Stress
Contours. Finally, the analysis results will be verified using some of the unique post
processing features of GTS.
Starting GTS
Start the program.
1. Run GTS.
2. Start a new project by clicking File > New button.
3. Project Setting dialog box will appear.
4. Enter ‘Basic Tutorial 4’ in Project Title.
5. Enter ‘2D’ in Model Type.
6. Enter ‘X-Y Plane’ in Analysis Constraint.
7. Use default values for rest of the inputs.
8. Click button.
9. Select View > Display Option... in the Main Menu.
10. Select Mesh > Node Display as ‘False’ in the General Tab.
11. Click button.
2D Analysis of Stage Constructed Embankment
2
Preview
The following model will be used in this tutorial. The ground is formed with 3 different
layers of materials, and the embankment is split into 3 stages. Each ground material and
embankment stage will be grouped separately in different Mesh Set, to easily manage and
define construction stage. The geometric shape and mesh formation is as follows:
GTS Basic Tutorial 4 - 1
GTS Basic Tutorial 4 - 2
2tonf/m
3@
3m
12m
12m
6m
39m
23m
50m25m
100m
25m
Soil 4 (Sand, SW)
Soil 1 (Silt, ML)
Soil 2 (Clay, CL)
Soil 3 (Silty Sand, SM)
Z
X
GTS Basic Tutorial 4
3
The Mesh Sets are generated as follows.
GTS Basic Tutorial 4 - 3
The Mesh Sets are defined as follows.
Mesh Set Name Attribute Name(ID) Material Name(ID)
Soil 1 Soil 1 (1) Silt (1)
Soil 2 Soil 2 (2) Clay (2)
Soil 3 Soil 3 (3) Silty Sand (3)
Embank 1
Embank (4)
Sand (4) Embank 2
Embank 3
GTS Basic Tutorial 4 - Table 1
The Ground properties are as follows.
ID 1 2 3 4
Soil Silt Clay Silty Sand Sand
Type MC MC MC MC
Modulus of Elasticity (E) [tonf/m2] 1000 600 2000 3000
Poisson’s Ratio () 0.35 0.35 0.3 0.3
Unit Weight () [tonf/m3] 1.7 1.6 1.8 1.8
Unit Weight (Saturated) [tonf/m3] 1.8 1.7 1.9 1.9
Cohesion (C) [tonf/m2] 2.0 3.0 1.0 1.0
Friction Angle () 20 10 30 33
Tensile Strength [tonf/m2] 2.0 3.0 1.0 1.0
* MC : Mohr Coulomb Model
GTS Basic Tutorial 4 - Table 2
Soil 3
Soil 1
Embank 1
Soil 2
Embank 3 Embank 2
2D Analysis of Stage Constructed Embankment
4
Create Analysis Data
Attribute
We will now define the Attributes of the ground. In a two dimensional model, the type of
ground is always Plane.
1. Select Model > Property > Attribute…in the Main Menu.
2. Click button to the right of button in the Attribute dialog box.
3. Select ‘Plane’.
4. Make sure that Attribute ID is ‘1’ in the Add/Modify Solid Attribute dialog box.
5. Enter ‘Soil 1’ in Name.
6. Make sure that ‘Plane Strain’ is selected in Element Type.
7. In order to create Material, click button at the right of Material.
Attribute of ID 1 is Plane, and the ground material property is Soil 1. Plane Attribute does
not require to have Property, and only the type of Material needs to be defined.
8. Enter ‘1’ in ID.
9. Enter ‘Silt’ in Name.
10. In the Add/Modify Ground Material dialog box select ‘Mohr Coulomb’ in
Constitutive Model of Model Type.
11. Select Color .
12. Enter ‘1000’ in Material Parameters in Modulus of Elasticity (E).
13. Enter ‘0.35’ in Poisson’s Ratio () in Material Parameters.
14. Enter ‘1.7’ in Unit Weight () in Material Parameters.
15. Enter ‘1.8’ in Unit Weight (Saturated) in Material Parameters.
16. Enter ‘2.0’ in Cohesion (C) in Material Parameters.
17. Enter ‘20’ in Material Parameters in Friction Angle ( ).
18. Enter ‘2.0’ in Tensile Strength in Parameters of Constitutive Model.
19. Make sure that ‘Drained’ is checked in Drainage Parameters.
20. Click button.
For 2D analysis, the
ground should be
modeled using the
Plane Attributes.
GTS Basic Tutorial 4
5
GTS Basic Tutorial 4 - 4
2D Analysis of Stage Constructed Embankment
6
21. Click button in the Material dialog box.
22. Make sure that ‘Silt’ has been generated in Material in the Add/Modify Plane
Attribute dialog box.
23. Click button.
GTS Basic Tutorial 4 - 5
24. Similarly, enter the Attributes for Soil 2, Soil 3 and Embank in Figures GTS Basic
Tutorial 4 – 6 ~ GTS Basic Tutorial 4 – 11. The values are given in GTS Basic
Tutorial Table 1 and Table 2.
GTS Basic Tutorial 4
7
GTS Basic Tutorial 4 - 6
GTS Basic Tutorial 4 – 7
2D Analysis of Stage Constructed Embankment
8
GTS Basic Tutorial 4 - 8
GTS Basic Tutorial 4 - 9
GTS Basic Tutorial 4
9
GTS Basic Tutorial 4 - 10
GTS Basic Tutorial 4 - 11
2D Analysis of Stage Constructed Embankment
10
GTS Basic Tutorial 4 - 12
GTS Basic Tutorial 4
11
2D Geometry Modeling
Rectangle, Polyline and Line
Draw outline of the model shape with Rectangle, Polyline and Line tools. First, full ground
model area will be created with the Rectangle tool.
1. Select Geometry > Curve > Create on WP > Rectangle (Wire)… in the Main Menu.
2. Make sure that Mode is set to in the Rectangle dialog box.
3. Make sure that the Method is set to ‘ABS x, y’.
4. Make sure that it says Input One Corner in the Rectangle dialog box.
5. Make sure that Make Face option is not checked.
6. Enter ‘-50,0’ in Location, and press Enter key.
7. Make sure that it says Input Diagonally Opposite Corner in the Rectangle dialog box.
8. Make sure that the Method is set to ‘REL dx, dy’.
9. Enter ‘100, -30’ in Location, and press Enter key
10. Click button and Click „Yes‟ to create new Polyline.
11. Click Zoom All in the View Point Toolbar.
Draw outline of the embankment with the Polyline tool.
12. Select Geometry > Curve > Create on WP > Polyline (Wire)… in the Main Menu.
13. Make sure that it says Input Start Location in the Polyline dialog box.
14. Make sure that the Method is set to ‘ABS x, y’.
15. Enter ‘-25,0’ in Location and press Enter key.
16. Make sure that it says Input Next Location (RB to Stop) in the Polyline dialog box.
17. Make sure that the Method is set to ‘REL dx, dy’.
18. Enter ‘13.5,9’ in Location and press Enter key.
19. Enter ‘23,0’ in Location and press Enter key.
20. Enter ’13.5,-9’ in Location and press Enter key.
21. Make sure that Make Face option is not checked.
22. Confirm that Polyline has been generated in the Work Window.
23. Click button.
In this mode, the user can
draw a rectangle by
entering two corners. For
detailed information,
please refer to the Online
Manual.
Not only Polyline but also
almost all the functions
for creating curves
support various methods
of entering coordinates,
such as „ABS x,y‟ and
„REL dx, dy.‟ For detailed
information, please refer
to the Online Manual.
2D Analysis of Stage Constructed Embankment
12
Draw Lines which represent the construction stages and multiple strata.
24. Select Geometry > Curve > Create on WP > Line… in the Main Menu.
25. Make sure that it says Input Start Location in the Line dialog box.
26. Make sure that the Method is set to ‘ABS x, y’.
27. Enter ‘-50,-24’ in Location and press Enter key.
28. Make sure that it says Input End Location in the Line dialog box.
29. Make sure that the Method is set to ‘REL x, y’.
30. Enter ‘100,0’ in Location and press Enter key.
31. Repeat Steps 25~30 to draw a Line from ‘-50,-12’ to ‘100,0’.
32. Repeat Steps 25~30 to draw a Line from ‘-25,3’ to ‘50,0’.
33. Repeat Steps 25~30 to draw a Line from ‘-25,6’ to ‘50,0’.
34. Click button.
GTS Basic Tutorial 4 - 13
GTS Basic Tutorial 4
13
Intersect
In order to generate the mesh properly, all the Edges must be “broken” at locations where
they intersect with the other Edges. After “breaking” the Edges using the Intersect tool, we
will delete the unnecessary Edges.
1. Select Zoom All in the Dynamic View Toolbar.
2. Select Geometry > Curve > Intersect… in the Main Menu.
3. Select Displayed in the Selection Toolbar.
4. Click button.
5. Click to close the Intersect dialog box.
6. Select Edge A, B, C & D in the Work Window as shown in GTS Basic Tutorial 4 - 14.
7. Enter Delete key.
8. Click in the Delete dialog box.
GTS Basic Tutorial 4 - 14
Edge A
Edge C Edge D
Edge B
In the Delete dialog
box, the user can see
the list of deleting
items, but one cannot
add or remove items.
2D Analysis of Stage Constructed Embankment
14
2D Mesh Generation
Size Control
In this section, proper mesh size will be defined along the Edges prior to generating a
mapped mesh. In order to obtain accurate results, it is necessary to generate fine mesh
around the embankment.
1. Select Mesh > Size Control > Along Edge… in the Main Menu.
2. In button, select Edge A, B, C and D as shown in
GTS Basic Tutorial 4 - 15.
3. Select ‘Number of Divisions’ in Seeding Method.
4. Enter ‘25’ in Number of Divisions.
5. Click (Preview) button to check if the seeding would be distributed correctly.
6. Click button.
7. In button, select Edge E, F, G, H, I and J as shown
in GTS Basic Tutorial 4 - 15.
8. Select ‘Number of Divisions’ in Seeding Method.
9. Enter ‘3’ in Number of Divisions.
10. In button, select Edge K and L. as shown in GTS
Basic Tutorial 4 - 15.
11. Select ‘Number of Divisions’ in Seeding Method.
12. Enter ‘4’ in Number of Divisions.
13. Click button.
GTS Basic Tutorial 4 - 15
A B C
D
E
G F
H
J I
K L
M N
O
GTS Basic Tutorial 4
15
The display can be set up to view the Seeding by selecting Mesh > Size Control > Display
Mesh Seed in the Main Menu. The Seeding can also be viewed as follows:
14. Select Displayed in the Selection Toolbar to select all the Edges.
15. Invoke the Context Menu by right-clicking the mouse.
16. Select Display Mesh Seed.
17. Make sure that ‘Show Mesh Seed’ is checked.
18. Click button.
GTS Basic Tutorial 4 - 16
Match Edge Seed function will duplicate mesh size information of the Edge(s) that were
previously seeded using the Size Control function. In order to copy the seeding information
at the top Edges to the bottom, we will use the Match Edge Seed function.
19. Select Mesh > Size Control > Match Edge Seeds… in the Main Menu.
20. In button, select Edge M as shown in GTS Basic
Tutorial 4 - 15.
21. In button, select Edges D, K and L as shown in GTS
Basic Tutorial 4 - 15.
22. Select ‘Projection’ in Match Method.
23. Make sure that Re-assign Size Control is checked.
24. Make sure that ‘Unseeded Only’ is checked.
25. Enter ‘Element Size’ as ‘4’ in Mesh Size.
26. Click (Preview) button to check if the seeding would be distributed correctly.
27. Click button.
The function also can
be invoked by selecting
Mesh > Size Control >
Display Mesh Seed… in
the main menu.
2D Analysis of Stage Constructed Embankment
16
The two assigned source Edges (K and L) which have been seeded with a Size of 4 has now
been Projected to a target edge, in particular edge M. This procedure will be repeated for
edges N and O.
GTS Basic Tutorial 4 - 17
28. In button, select Edge N as shown in GTS Basic
Tutorial 4 - 15.
29. In button, select Edge M as shown in GTS Basic
Tutorial 4 - 15.
30. Select ‘Projection’ in Match Method.
31. Click (Preview) button to check if the seeding would be distributed correctly.
32. In button, select Edge O as shown in GTS Basic
Tutorial 4 - 15.
33. In button, select Edge N as shown in GTS Basic
Tutorial 4 - 15.
34. Select ‘Projection’ in Match Method.
35. Click (Preview) button to check if the seeding would be distributed correctly.
36. Click button.
Project…
GTS Basic Tutorial 4
17
GTS Basic Tutorial 4 - 18
37. Select Displayed in the Selection Toolbar to select all the Edges.
38. Select Mesh > Size Control > Display Mesh Seed… in the Main Menu.
39. Select Hide Mesh Seed.
40. Click button.
2D Analysis of Stage Constructed Embankment
18
Map Mesh k-Edge Area
We will now generate a 2D Mesh using Mapped Mesh Generation. The k-Edge Area
function will fill the closed area with 2D elements, which are defined by boundary 2D
Edges.
1. Select Mesh > Map Mesh > k-Edge Area… in the Main Menu.
2. Make sure that ‘Auto-Map’ is checked.
3. In button, select Edges N, R, O and U as shown in
GTS Basic Tutorial 4 - 19.
4. Enter ‘2’ in ‘Division’ in Mesh Size.
5. Select Attribute ID as ‘3 : Soil 3’.
6. Rename ‘Map-Mesh(2D)’ in Mesh Set and enter ‘Soil 3’.
7. Click (Preview) button to check if the seeding would be distributed correctly.
8. Click button.
9. In button, select Edges M, Q, N and T as shown in
GTS Basic Tutorial 4 - 19.
10. Enter ‘3’ in ‘Division’ in Mesh Size.
11. Select Attribute ID as ‘2 : Soil 2’.
12. Rename ‘Soil 3’ in Mesh Set and enter ‘Soil 2’.
13. Make sure that Merge Nodes is checked on.
14. Click (Preview) button to check if the seeding would be distributed correctly.
15. Click button.
16. In button, select Edges D, K, P, M, S and L as shown
in GTS Basic Tutorial 4 - 19.
17. Select Attribute ID as ‘1 : Soil 1’.
18. Rename ‘Soil 2’ in Mesh Set and enter ‘Soil 1’.
19. Click (Preview) button to check if the seeding would be distributed correctly.
20. Click button.
21. In button, select Edges C, G, D and J as shown in
GTS Basic Tutorial 4 - 19.
22. Select Attribute ID as ‘4 : Embank’.
23. Rename ‘Soil 1’ in Mesh Set and enter ‘Embank 1’.
24. Click (Preview) button to check if the seeding would be distributed correctly.
25. Click button.
26. In button, select Edges B, F, C and I as shown in GTS
This Division will be applied
only to Edges R & U. Since
facing Edges must have the
same number of divisions,
seeding of Edge N will be
applied automatically to
Edge O.
For detail information of
Map Mesh k-Edge Area, refer
to the Online Manual.
Since all Edges are seeded
already, the mesh size is
meaningless here.
Since the connectivity in
this model must be
matched, Merge Nodes
must be turned on at all
time.
GTS Basic Tutorial 4
19
Basic Tutorial 4 - 19.
27. Rename ‘Embank 1’ in Mesh Set and enter ‘Embank 2’.
28. Click (Preview) button to check if the seeding would be distributed correctly.
29. Click button.
30. In button, select Edges A, E, B and H in GTS Basic
Tutorial 4 - 19.
31. Rename ‘Embank 2’ in Mesh Set and enter ‘Embank 3’.
32. Click (Preview) button to check if the seeding would be distributed correctly.
33. Click button.
Previously seeded Edges will not be affected by the size information that has been specified
during Mesh Generation.
GTS Basic Tutorial 4 - 19
A B C
D
E
G F
H
J I
K L
M N
O
P
Q
R
S
T
U
2D Analysis of Stage Constructed Embankment
20
GTS Basic Tutorial 4 - 20
As shown in the above figure, Mapped Mesh generates a better quality mesh. However, it
takes a longer amount of time to generate.
In this model, the user can also generate a 2D Mesh using the Auto Mesh Generation
function, by selecting Mesh > Auto Mesh > Planar Area in the Main Menu. Using Auto
Mesh Planar Area, all areas defined by boundary Edges can be meshed automatically.
1. Select Mesh > Auto Mesh > Planar Area… in the Main Menu.
2. In button, select Displayed in Selection
Toolbar.
3. Select ‘Loop Mesher’ in Mesher.
4. Select ‘Quadrilateral’ in Type.
5. Enter ‘4’ in ‘Element Size’ in Mesh Size.
6. Select Attribute ID ‘1 : Soil 1’.
7. Make sure that Register Each Area Independently is checked.
8. Click (Preview) button to check if the seeding would be distributed correctly.
9. Click button.
All created Mesh Sets have been assigned with Attribute ID 1. In order to perform the
correct analysis, the user should apply proper Attribute to each Mesh Set.
This step only shows the
steps for performing Auto
Mesh Generation. The
rest of this tutorial will
use the mesh generated
by Map Mesh.
For detailed information
on Auto Mesh Planar
Area, please refer to the
Online Manual.
GTS Basic Tutorial 4
21
GTS Basic Tutorial 4 - 21
Since we will not be using all the Geometry entities any further, we will hide them.
1. Select Geometry in the Works Tree.
2. Invoke the Context Menu by right-clicking the mouse.
3. Select Hide All.
2D Analysis of Stage Constructed Embankment
22
Analysis
Load
In this model, two load cases will be created. General self weight of the ground and uniform
pressure load on top of the embankment will be applied. Since these two loads will be
induced at different construction stages, it is necessary to create separate load cases for each
load.
Self weight will be created first.
1. Select Model > Load > Self Weight… in the Main Menu.
2. Enter ‘Self Weight’ in Load Set.
3. Enter Y as ‘-1’ in Self Weight Factor.
Apply uniform pressure load on top of embankment.
4. Invoke the Context Menu on Datum in the Works Tree by right-clicking the mouse.
5. Select Show All.
6. Select Zoom Window in the Dynamic View Toolbar.
7. The model is generated as shown in GTS Basic Tutorial 4 - 22.
8. Select Model > Load > Pressure Load… in the Main Menu.
9. Enter ‘Pressure’ in Load Set.
10. Select ‘Edge Pressure’ in Type.
11. Select ‘Element-Edge’ in Type in Object.
12. In button, select the 25 Element Edges by
dragging the mouse in the Work Window as shown in GTS Basic Tutorial 4 - 22.
13. Select ‘Add’ in Mode.
14. Select Direction in ‘Direction’.
15. Click button.
16. Select ‘Datum Axis (A)’ in the Selection Filter of the Selection Toolbar.
17. In button, select Datum > ‘Y-Axis’ in the Works Tree.
Note: The Y-Axis can be selected directly from the work window by selecting the
green perforated line. Datum must be shown in the work window.
18. Make sure that Uniform is checked.
19. Enter ‘-2’ in P or P1.
20. Click (Preview) button to check if Pressure would be distributed correctly.
Various load cases can
be defined in each
construction stage.
This way, the user
does not require to
create a Load Set
manually. The program
will automatically
register defined self
weight in the “Self
Weight” Load Set.
GTS Basic Tutorial 4
23
21. Click button.
GTS Basic Tutorial 4 - 22
2D Analysis of Stage Constructed Embankment
24
Support
Define boundary conditions in this model. The bottom will be constrained with Hinge-type
supports, and the left and right side will be with Roller-type supports.
1. Select Zoom All in the Dynamic View Toolbar.
2. Invoke the Context Menu by right-clicking the mouse in the Work Window.
3. Select Toggle GCS Triad.
4. Select Model > Boundary > Supports… in the Main Menu.
5. Enter ‘Common Support’ in BC Set.
6. Select ‘Node’ in Object in Type.
7. In button, select the 18 nodes by dragging the mouse
‘A’ and ‘B’ in the Work Window as shown in GTS Basic Tutorial 4 - 23.
8. Select ‘Add’ in Mode.
9. Select ‘UX’ in DOF.
10. Click button.
11. Select ‘Common Support’ in BC Set.
12. Select ‘Node’ in Object in Type.
13. In button, select the 38 nodes by dragging the mouse
‘C’ in the Work Window as shown in GTS Basic Tutorial 4 - 23.
14. Select ‘Add’ in Mode.
15. Select ‘UX’ and ‘UY’ in DOF.
16. Click button.
GTS Basic Tutorial 4 - 23
This way, the user does
not require to create a
Boundary Set manually.
The program will
automatically register the
defined boundary
conditions in the
“Common Support”
Boundary Set.
Boundary condition
will be input based on
Global Coordinate
System. Therefore, it is
recommended to turn
the GCS Triad on as a
visual reference
A B
C
GTS Basic Tutorial 4
25
Define Construction Stage
Define construction stage for this model. The first construction stage will have only the
initial ground condition loaded with self weight.
1. Select Model > Construction Stage > Define Construction Stage… in the Main Menu.
2. Click button.
3. Enter ‘BT4 Stage 1’ in Stage Name.
4. Select ‘Construction’ in Stage Type.
5. Select Element > ‘Soil 1’, ‘Soil 2’, ‘Soil 3’ in Set Data of Tree.
6. Drag the Mesh Set into Activated Data.
7. Select ‘Activated’ in Show Elements.
8. Select Boundary > ‘Common Support’ in Set Data of Tree.
9. Drag the Boundary Set into Activated Data.
10. Select Load > ‘Self Weight’ in Set Data of Tree.
11. Drag the Load Set into Activated Data.
12. Make sure that Clear Displacement is checked.
13. Select Stage Water Level and enter 0 m.
14. Click button.
In the second construction stage, the first embankment will be constructed.
4. Click button.
5. Enter ‘BT4 Stage 2’ in Stage Name.
6. Select Element > ‘Embank 1’ in Set Data of Tree.
7. Drag the Mesh Set into Activated Data.
8. Click button.
2D Analysis of Stage Constructed Embankment
26
In the third construction stage, the second embankment will be constructed.
9. Click button.
10. Enter ‘BT4 Stage 3’ in Stage Name.
11. Select Element > ‘Embank 2’ in Set Data of Tree.
12. Drag the Mesh Set into Activated Data.
13. Click button.
In the fourth construction stage, the third embankment will be constructed.
14. Click button.
15. Enter ‘BT4 Stage 4’ in Stage Name.
16. Select Element > ‘Embank 3’ in Set Data of Tree.
17. Drag the Mesh Set into Activated Data.
18. Click button.
In the fifth construction stage, the pressure loading will be applied.
19. Click button.
20. Enter ‘BT4 Stage 5’ in Stage Name.
21. Select Load > ‘Pressure’ in Set Data of Tree.
22. Drag the Load Set into Activated Data.
23. Click button.
24. Click on Define Construction Stage dialog box.
On the screen, the
pressure loading will be
shown as the last stage
of the embankment is
generated. All load
display must be
attached to relevant
nodes and elements.
Despite the load display,
the actual loading will
not be entered in the
construction stage
analysis until the user
defines it. Therefore, the
user should not be
confused by the display
of pressure load.
GTS Basic Tutorial 4
27
GTS Basic Tutorial 4 – 24
Stage 1
Stage 2
Stage 3
Stage 4
Stage 5
2D Analysis of Stage Constructed Embankment
28
Analysis Case
We will create an Analysis Case for performing analysis.
1. Select Analysis > Analysis Case… in the Main Menu.
2. Click button.
GTS Basic Tutorial 1 - 26
Input the values in Add/Modify Analysis Case dialog box.
3. Enter ‘Basic Tutorial 4’ in Name.
4. Enter ‘2D C/S Analysis’ in Description.
5. Select ‘Construction Stage’ in Analysis Type.
6. Click on button to the right of Analysis Control.
GTS Basic Tutorial 4
29
In Analysis Control, we will define specific options for the Construction Stage Analysis.
7. Make sure that Initial Stage for Stress Analysis is checked in the Construction Stage
Tab of Analysis Control dialog box.
8. Select ‘BT4 Stage 1’ in Initial Stage for Stress Analysis.
9. Select K0 Condition.
10. Click button.
11. Click button in the Add/Modify Analysis case dialog box.
12. Click button in the Analysis Case dialog box.
GTS Basic Tutorial 1 - 27
2D Analysis of Stage Constructed Embankment
30
Solve
We will now perform analysis.
1. Select Analysis > Solve… in the Main Menu.
2. Click in the Solver Manager dialog box.
All the messages during the analysis will be shown in the Output Window. Especially, one
needs to be very cautious about warning messages, because these messages indicate that the
analysis results may not be correct. The model is automatically saved before the analysis.
The result is saved as binary file(*.TA*) in the same folder as the model. The detail analysis
information is also saved in a text file(*.OUT).
GTS Basic Tutorial 1 – 28
GTS Basic Tutorial 4
31
Post Processing, Result Display and Control
Once the analysis is completed, we will begin Post-Processing. We will check the
Displacement Contour and Stress Contour.
1. Select Boundary in the Works Tree.
2. Invoke the Context Menu by right-clicking the mouse.
3. Select Hide All.
4. Select Geometry in the Works Tree.
5. Invoke the Context Menu by right-clicking the mouse.
6. Select Hide All.
7. Invoke the Context Menu in the Work Window by right-clicking the mouse when no
entity is selected.
8. Select Hide Datum & WP.
9. Invoke the Context Menu in the Work Window by right-clicking the mouse when no
entity is selected.
10. Select Hide All Labels.
In order to have a clean view of results, it is better to hide all the load labels, boundary
labels and other symbols.
2D Analysis of Stage Constructed Embankment
32
Displacement Contour
We will first check the displacements in the X-direction at the last stage.
1. Select the Post-Works Tab in the Works Tree.
2. Select CS : Basic Tutorial 4 > BT4 Stage 5-001(1) > Displacement > ‘DX(V)’ in the
Works Tree.
3. Select the Post Data Tab in the Tabbed Toolbar.
4. Select ‘BT4 Stage 5-001(1)’ and click on Output Set in the Post Data Toolbar.
5. Make sure that Sensitive is checked on in the Output Set as shown in GTS Basic
Tutorial 4 – 29.
6. Click button.
- Post Data Toolbar -
GTS Basic Tutorial 4 - 29
With Sensitive is turned
on, the contour shape is
updated in real time as
stage changes.
Plot Type Mesh Shape Data Filter
Output Set Deformation Data Contour Data
GTS Basic Tutorial 4
33
GTS Basic Tutorial 4 - 30
We will now check the deformed shape in the Y-direction at the last stage.
7. Click Sensitive button in the Post Data Toolbar.
8. Unselect ‘DX(V)’ and select ‘DY(V)’ in Contour Data of the Post Data Toolbar and
click button.
9. Unselect ‘DX(V)’ and select ‘DY(V)’ in Deformation Data of the Post Data Toolbar.
10. Click Mesh Shape button.
11. Select Deformed + Undeformed.
Another feature of GTS is the Toolbar provided for Post-Processing. By selecting the
Property Window in the Post-Processing mode toolbar, the various options can be identified
and modified.
When button is
turned on, change in
any Post Data will be
automatically reflected
in the contour display.
2D Analysis of Stage Constructed Embankment
34
12. Select ‘Deformation’ in the Property Window.
13. Select ‘True’ in Real Displacement in the Property Window.
14. Click in the Property Window.
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GTS Basic Tutorial 4
35
Stress Contour
We will display the Stresses at the last stage. First, we will check the Sxx result of 2D
Elements. In addition, we will hide the Mesh Edges.
1. Select CS : Basic Tutorial 4 > BT4 Stage 5-001(1) > 2D Element Stresses > ‘SXX
Center’ in the Works Tree.
2. Click Mesh Shape button in the Post Data Toolbar.
3. Select Undeformed.
4. Select the Post Command Tab in the Tabbed Toolbar.
5. Click Edge Type in the Post Command Toolbar.
6. Select ‘No Edge’.
7. Select ‘Contour’ in the Property Window.
8. Select ‘True’ in Contour Line On/Off.
9. Enter ‘16’ in Band Number.
10. Click button in the Property Window.
GTS Basic Tutorial 1 – 32
In order to check the
stresses more accurately,
increase the contour
band color number
2D Analysis of Stage Constructed Embankment
36
We will now check the Szz result of 2D Elements at the last stage.
11. Select CS : Basic Tutorial 4 > BT4 Stage 5-001(1) > 2D Element Stresses > ‘SYY
Center’ in the Works Tree.
12. Select the Post Command Tab in the Tabbed Toolbar.
13. Click Edge Type in the Post Command Toolbar.
14. Select ‘Mesh Edge’.
15. Select ‘Contour’ in the Property Window.
16. Select ‘False’ in Contour Line On/Off.
17. Click button in the Property Window.
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