Loadi
1. Go to Start>Programs>Bentley>InRoads Group XM and load the product “Bentley Rail Track”.
2. From
7. Click Cancel to dismiss the dialog box.
Using Horizontal Single Element Regression Analysis
Starting a Horizontal Alignment Using SER 111
Starting a Horizontal Alignment using Single Element Regression Analysis (SER)
In this chapter, you will use a series of geometry commands to establish the beginning elements for a new horizontal
alignment. While Bentley Rail Track provides various methods to create horizontal alignments, the single element regression method is used here to demonstrate how these unique
commands can be used in a typical railway design.
Before Getting Started
Locate the tutorial data in C:\Program
\Bentley\Tutorials\Rail. Extract RailChapter9.exe Loading Your Files
Go to Start>Programs>Bentley>InRoads Group XM and load the product “Bentley Rail Track”.
From C:\Program Files\Bentley\Tutorials\Rail rail_tutorial.dgn or rail_tutorial.dwg file.
Click File > Open.
Set the directory to C:\Program Files\Bentley\Tutorials\Rail.
Select railm_tut.xin, and click Open.
Select singletrack.alg and click Open.
Click Cancel to dismiss the dialog box.
Using Horizontal Single Element Regression Analysis
Starting a Horizontal Alignment using Single Element Regression
In this chapter, you will use a series of geometry commands to establish the beginning elements for a new horizontal
alignment. While Bentley Rail Track provides various methods the single element regression method is used here to demonstrate how these unique
RailChapter9.exe.
Go to Start>Programs>Bentley>InRoads Group XM and Rail open the
Using Horizontal Single Element Regression
Once regression points have been added to the geometry project, elements can be added to the project alignment. When working with regression points, you can add, modify and delete points using the command dialog box or by graphically
selecting points in the graphic view. In this task, you will select points graphically in the view.
1. Delete all graphics in the design file.
2. Click Geometry > Horizontal Regression > View Regression Points.
3. Click Apply; then, Close.
Zoom in to see the ac
4. Visually review the regression points. Click Geometry >
Horizontal Regression > Edit/Review Regression Points.
5. Scroll the list and multi
Once regression points have been added to the geometry project, elements can be added to the project alignment. When working with regression points, you can add, modify and delete points using the command dialog box or by graphically
electing points in the graphic view. In this task, you will select points graphically in the view.
Delete all graphics in the design file.
Click Geometry > Horizontal Regression > View Regression Points.
Click Apply; then, Close.
Zoom in to see the actual points.
Visually review the regression points. Click Geometry >
Horizontal Regression > Edit/Review Regression Points.
Scroll the list and multi-select points 11, 12 & 13.
Once regression points have been added to the geometry project, elements can be added to the project alignment. When working with regression points, you can add, modify and delete points using the command dialog box or by graphically
electing points in the graphic view. In this task, you will
Click Geometry > Horizontal Regression > View Regression
Visually review the regression points. Click Geometry >
Horizontal Regression > Edit/Review Regression Points.
select points 11, 12 & 13.
Starting a Horizontal Alignment Using SER
It appears that points 11, 12, & 13 are irregular. These points may reflec
best possible alignment solution, you must take steps to reduce their influence on the present data set. To begin, you will reduce the weighting associated with these points.
6. Click the Edit.
7. For Weight, type
8. Click Apply; then, Close.
This change will not cause these points to be ignored in future analysis, however it will decrease their influence on regression calculations. For more information on the Weight option, see Bentley
Notic
Edit/Review Horizontal Regression Points dialog box:
Starting a Horizontal Alignment Using SER 113
It appears that points 11, 12, & 13 are irregular. These points may reflect a survey error. In order to create the best possible alignment solution, you must take steps to reduce their influence on the present data set. To begin, you will reduce the weighting associated with these points.
Click the Edit.
For Weight, type 0.001.
Click Apply; then, Close.
This change will not cause these points to be ignored in future analysis, however it will decrease their influence on regression calculations. For more information on the Weight option, see Bentley InRoads Group XM Help Notice that the Weight value has been modified in the Edit/Review Horizontal Regression Points dialog box:
It appears that points 11, 12, & 13 are irregular. These t a survey error. In order to create the best possible alignment solution, you must take steps to reduce their influence on the present data set. To begin, you will reduce the weighting associated with these points.
This change will not cause these points to be ignored in future analysis, however it will decrease their influence on regression calculations. For more information on the
InRoads Group XM Help.
e that the Weight value has been modified in the Edit/Review Horizontal Regression Points dialog box:
Note
you will see in the next few steps, it’s most convenient to keep the dialog box active, but mini
the graphic view.
9. On the Edit/Review Horizontal Regression Points dialog box, deselect/unhighlight points 11, 12, and 13. Click the Select button.
10. Using the CAD command, zoom into the view.
11. Graphically select points 1 through 19.
12. At
The points are highlighted in the Edit/Review Horizontal Regression Points dialog box. Notice the Include in Analysis column is now set to yes for these points:
13. Collapse, do not close, the dialog box.
14. Clic
Regression Analysis.
15. For Element type, select Linear.
This indicates that points 1 through 19 will be regressed as a linear element in the alignment.
16. For Save Order, select Last Element.
Note When editing or working with regression points, as you will see in the next few steps, it’s most convenient to keep the dialog box active, but minimized, as you work in the graphic view.
On the Edit/Review Horizontal Regression Points dialog box, deselect/unhighlight points 11, 12, and 13. Click the Select button.
Using the CAD command, zoom into the view.
Graphically select points 1 through 19.
At the prompt: Accept/Reject, accept the points.
The points are highlighted in the Edit/Review Horizontal Regression Points dialog box. Notice the Include in Analysis column is now set to yes for these points:
Collapse, do not close, the dialog box.
Click Geometry > Horizontal Regression > Single Element Regression Analysis.
For Element type, select Linear.
This indicates that points 1 through 19 will be regressed as a linear element in the alignment.
For Save Order, select Last Element.
When editing or working with regression points, as you will see in the next few steps, it’s most convenient to
mized, as you work in
On the Edit/Review Horizontal Regression Points dialog box, deselect/unhighlight points 11, 12, and 13. Click the
The points are highlighted in the Edit/Review Horizontal Regression Points dialog box. Notice the Include in Analysis column is now set to yes for these points:
k Geometry > Horizontal Regression > Single Element
This indicates that points 1 through 19 will be regressed as
Starting a Horizontal Alignment Using SER 17. Click Compute.
The results of the computation are displayed in the Results field, and a slew diagram showing the magnitude of the point’s offset relative to the element is shown in temporary graphics along the element.
18. Click Save. Collapse, but do not close the dialog b
By regressing points 1 through 19, you have added a linear element to the horizontal alignment. Next, you will move along the points to add another element.
19. Fit the view.
20. Click Geometry > Horizontal Regression > Curvature Diagram.
21. Click the Preference
22. Highlight curve diagram, click Load; then, Close.
23. Next, specify the symbology for the curve diagram.
•
Starting a Horizontal Alignment Using SER 115 Click Compute.
The results of the computation are displayed in the Results field, and a slew diagram showing the magnitude of the point’s offset relative to the element is shown in temporary graphics along the element.
Click Save. Collapse, but do not close the dialog b
By regressing points 1 through 19, you have added a linear element to the horizontal alignment. Next, you will move along the points to add another element.
Fit the view.
Click Geometry > Horizontal Regression > Curvature Diagram.
Click the Preferences button.
Highlight curve diagram, click Load; then, Close.
Next, specify the symbology for the curve diagram.
On the “General” leaf under Horizontal Curvature Diagram, turn ON Line, Points, and Text in the Symbology box.
Click the Axes folder, then Left folder, then the General leaf.
Change the Length of both Major Ticks and Minor Ticks to 0.010.
Click on the Symbology leaf.
In the Symbology box, double-click to edit Title Text.
Under Offsets, change Horizontal to 0. Press the TAB key. Click Ok.
Double-click to edit Label.
Under Offsets, change Horizontal to 0. Press the TAB key. Click Ok.
Turn ON the check boxes for Major and Minor Ticks.
Click the Preferences button. Highlight curve diagram, click Save; then, Close.
The results of the computation are displayed in the Results field, and a slew diagram showing the magnitude of the point’s offset relative to the element is shown in temporary Click Save. Collapse, but do not close the dialog box.
By regressing points 1 through 19, you have added a linear element to the horizontal alignment. Next, you will move
Click Geometry > Horizontal Regression > Curvature
Highlight curve diagram, click Load; then, Close.
Next, specify the symbology for the curve diagram.
On the “General” leaf under Horizontal Curvature Diagram, turn ON Line, Points, and Text in the
folder, then the General Change the Length of both Major Ticks and Minor
click to edit Title Text.
Under Offsets, change Horizontal to 0. Press the TAB
Under Offsets, change Horizontal to 0. Press the TAB Turn ON the check boxes for Major and Minor Ticks.
Click the Preferences button. Highlight curve diagram,
24. Click Apply. At the prompt:
curvature diagram to the right of the existing graphics.
Close the Curvature Diagram dialog box.
NOTE: If the curvature diagram is un necessary to extract the
and go through steps 20 through 24 again.
25. In the curvature diagram, zoom in the view around points 27 to 52. It may be necessary to reduce the Zoom ratio to see all points in one view.
26. Uncollapse the Edit/Review Horizontal Regression dialog box.
27. Click th
28. In the curvature diagram, select points 27 to 52.
29. Datapoint again to accept the points.
30. Notice the next set of points are highlighted in the Edit/Review Horizontal Regression Analysis dialog box.
31. Uncollapse the Single Horizontal Regre dialog box.
32. For Element Type, select Circle.
33. For Save Order, select Last Element.
34. Click Compute; then, click Save.
Click Apply. At the prompt: Identify Location, place the curvature diagram to the right of the existing graphics.
Close the Curvature Diagram dialog box.
NOTE: If the curvature diagram is un-readable, it may be necessary to extract the railm_tut.xin from railchapter9.exe and go through steps 20 through 24 again.
In the curvature diagram, zoom in the view around points 27 to 52. It may be necessary to reduce the Zoom ratio to see all points in one view.
Uncollapse the Edit/Review Horizontal Regression dialog box.
Click the Select button.
In the curvature diagram, select points 27 to 52.
Datapoint again to accept the points.
Notice the next set of points are highlighted in the Edit/Review Horizontal Regression Analysis dialog box.
Uncollapse the Single Horizontal Regression Analysis dialog box.
For Element Type, select Circle.
For Save Order, select Last Element.
Click Compute; then, click Save.
Identify Location, place the curvature diagram to the right of the existing graphics.
readable, it may be railchapter9.exe In the curvature diagram, zoom in the view around points 27 to 52. It may be necessary to reduce the Zoom ratio to Uncollapse the Edit/Review Horizontal Regression dialog
In the curvature diagram, select points 27 to 52.
Notice the next set of points are highlighted in the Edit/Review Horizontal Regression Analysis dialog box.
ssion Analysis
Starting a Horizontal Alignment Using SER The circular element is added to the alignment.
35. Fit the view. Notice the elements in Plan view.
Next, you will add the la alignment.
36. On the Edit/Review Horizontal Regression Analysis dialog box, click Select
37. Graphically select points 63 to 85.
38. On the Single Horizontal Element Regression Analysis dialog box, click Circle and Last Element.
39. Click
The circular element is added to the alignment.
40. Click Select.
41. Graphically select points 103 to 129.
Note
within a view, remember that you can manually the select points in the Edit/Revi
dialog box.
Starting a Horizontal Alignment Using SER 117 The circular element is added to the alignment.
Fit the view. Notice the elements in Plan view.
Next, you will add the last three elements to the alignment.
On the Edit/Review Horizontal Regression Analysis dialog box, click Select
Graphically select points 63 to 85.
On the Single Horizontal Element Regression Analysis dialog box, click Circle and Last Element.
Click Compute; then Save.
The circular element is added to the alignment.
Click Select.
Graphically select points 103 to 129.
Note If you cannot graphically select all of the points within a view, remember that you can manually the select points in the Edit/Review Horizontal Regression Analysis dialog box.
The circular element is added to the alignment.
st three elements to the
On the Edit/Review Horizontal Regression Analysis dialog
On the Single Horizontal Element Regression Analysis
The circular element is added to the alignment.
If you cannot graphically select all of the points within a view, remember that you can manually the select
ew Horizontal Regression Analysis
42. On the Single Horizontal Element Regression Analysis dialog box, click Circle and Last Element.
43. Click Compute; then Save.
The circular element is added to the alignment. Now, add the last element in the alignm
44. Click Select.
45. Graphically select points 141 to 163.
46. On the Single Element Regression Analysis dialog box, click Linear and Last Element.
47. Click Compute; then Save.
48. Close all dialog boxes.
49. Zoom in on any portion of the alignment. Using the CAD commands,
50. Fit the graphics in the view.
Connecting Horizontal Alignment Elements Using Define Spiral
1. Click Tools > Application Add 2. Ensure the Horizontal and Vertica
turned on.
3. Click Ok.
4. Click Geometry > Horizontal Element > Define Spiral.
5. Select Clothoid.
6. Turn on the Replace and Fill All Gaps option.
7. Click Apply.
8. At the prompt: Identify first element, datapoint on the first linear element in the
On the Single Horizontal Element Regression Analysis dialog box, click Circle and Last Element.
Click Compute; then Save.
The circular element is added to the alignment. Now, add the last element in the alignment.
Click Select.
Graphically select points 141 to 163.
On the Single Element Regression Analysis dialog box, click Linear and Last Element.
Click Compute; then Save.
Close all dialog boxes.
Zoom in on any portion of the alignment. Using the CAD commands, delete the displayed regression points.
Fit the graphics in the view.
Connecting Horizontal Alignment Elements Using Define Spiral
Click Tools > Application Add-Ins.
Ensure the Horizontal and Vertical Elements Add turned on.
Click Ok.
Click Geometry > Horizontal Element > Define Spiral.
Select Clothoid.
Turn on the Replace and Fill All Gaps option.
Click Apply.
At the prompt: Identify first element, datapoint on the first linear element in the alignment.
On the Single Horizontal Element Regression Analysis
The circular element is added to the alignment. Now, add
On the Single Element Regression Analysis dialog box, click
Zoom in on any portion of the alignment. Using the CAD delete the displayed regression points.
Connecting Horizontal Alignment Elements Using
l Elements Add-In is
Click Geometry > Horizontal Element > Define Spiral.
At the prompt: Identify first element, datapoint on the first
Starting a Horizontal Alignment Using SER 119
9. At the prompt: Identify second element, datapoint on the first circular element in the alignment
10. Accept the solution
11. Continue to connect the elements in the alignment, except the last linear element. Do not connect the last linear and circular elements.
12. Reset to exit the command.
13. Fit the graphics in the view.
The horizontal alignment should appear as shown:
14. Click File > Save > Geometry Project.
To complete this horizontal alignment, continue to the next chapter.
15. Click File > Exit and exit your CAD software, or continue to Chapter 10, Completing a Horizontal Alignment using Multiple Element Regression Analysis.
9
Overview
In this chapter, you will
portion of a single track design using horizontal regression analysis. The existing geometry project contains an alignment from regression points.
Before Getting Started
Locate the tutorial data in Files\
Loading Your Files
1. Go to Start>Programs>Bentley>InRoads Group XM and load the product “Bentley Rail Track”.
2. From
rail_tutorial.dgn 3. Click File > Open.
4. Set the directory to Files
5. Select 6. Select
7. Click Cancel to dismiss the dialog box.
Using Multiple Analysis
Begin with the active horizontal alignment. All but the final element have been created and connected in the alignment. By displaying the current elements and the original regression