Chapter 2: SHA CAD Standards Concepts
Let’s look at an example:
Hands On Exercise – Using the SHA Detail Model (Bridge)
In this exercise, the standard shaDetail2D.dgn has been used to create a new file (pBR-BD01_chapter2.dgn). Additional elements have been added to the file to assist in understanding this concept. For example, elements may be drawn anywhere in the design file, however labels have been placed at the locations that we are going to place the elements. This is so we can easily remember the scale of the elements placed.
1. Open the file C:\Training\Chapter2\pBR-BD01_final.dgn This file shows what we will be working toward in this exercise.
Notice that although the blocks in the file are drawn in different scales, the dimension text is the same size. We will see how the block can be drawn in true size and the model concept will display the block at the scaled size and all the dimensions will be automatically scaled to display at the correct size on the final plotted sheet.
Note: Keep in mind that due to time constraints, this is a very simple example, we will only be drawing squares to demonstrate this workflow. On a project detail sheet the workflow would be the same, although the details would be more involved.
Adding Elements
2. Open the file C:\Training\Chapter2\pBR-BD01_chapter2.dgn
This file was created using the File Naming Wizard and selecting the Bridge/Structure – Details description.
Notice that we are currently in the Default model which has an associated scale of 1”=1’:
We are going to draw a simple MicroStation element. Before we draw the element we want to specify the scale of our individual “detail” by selecting the appropriate model.
Chapter 2: SHA CAD Standards Concepts
We are going to draw a 3’x3’ block near the area of the 1” Scale text in the file. 4. Select the MicroStationPlace Block tool from the main tool frame.
5. Data point at the location of the lower left corner of our block. Notice the AccuDraw compass appears.
6. While moving the pointer to the right, type 3 on the keyboard. This locks the X value of our block at 3’.
7. Move the pointer vertically and type 3 on the keyboard. This locks the Y value of our block at 3’.
Adding Text and Dimensions
Next we will add titles and dimensions to our detail using text and dimension styles. We are not going to use Barmenu to place these elements because many of the detailing items for this particular workflow are not currently included in the available features from the IDS Main Menu.
8. From the MicroStation main toolbox, select the Place Text tool. 9. In the tool settings window, select the text style Leroy_240.
10. In the text editor window, typeSca e 1”=1’-0”.l : 11. Place the detail title below the detail drawn previously.
12. From the MicroStation main toolbox, select the Dimension Element tool.
13. Expand the tool settings window if necessary and toggleON theAssociation option.
Important: If the Association option is unavailable, turn on the Association lock.
SHA_V8_2.01 2/22/2005
Chapter 2: SHA CAD Standards Concepts
14. Set the dimension style to Structural.
15. Follow the prompts in the MicroStation status bar to dimension the detail.
Drawing the Additional Scaled Details
16. Set the drawing scale to¾”=1’-0”.
17. Repeat steps 5-16 to place the detail, title and dimensions on the 3/4”=1’-0” detail. 18. Set the drawing scale to½”=1’0”.
19. Repeat steps 5-16 to place the detail, title and dimensions on the 1/2”=1’-0” detail.
Associated Dimensions
Because we chose to associate our dimensions when they were placed, if the element changes, the dimension will automatically update to reflect the element change.
20. Select the ½”=1’-0” model.
21. Use the Modify Element tool to change element in the½”=1’-0”detail. 22. Review the result.
23. Close the file.
InChapter 4 we will add a border to these details.
3D and 2D Files
MicroStation V8 eliminates the pitfalls many users faced with 2D vs. 3D files in V7. For example, grading files are often drawn in 3D; however, horizontal design files are often drawn in 2D. The grading file would have to be “flattened” in order to reference it into the horizontal design file. The 3D file would have to be exported to 2D, thereby creating a duplicate grading file. Any changes in the 3D file would have to be updated in the 2D copy.
With V8, that 3D grading file can be referenced into the 2D horizontal design file with no problem. There is no longer the need for duplicate files in MicroStation V8.
Chapter 4: Reference Files
Hands-on Exercise: Adding a Border to the Detail Model
In this exercise we will add the border to the Detail model we created in Chapter 2. 1. Open the file C:\Training\Chapter2\pBR-BD01_chapter2.dgn
The border we are going to use should be attached to the Default model since the Default model is nested into every other scaled model. By attaching it to the Default model, the border will be visible in any other model with no other input from the user.
2. Switch to theDefault model if necessary by using the View Groups dialog.
3. Access the Attach Reference tool from the reference file dialog.
4. Browse to the border file (C:\Training\Chapter2\xBL-0000_chapter2.dgn). 5. Make sure theSave Relative Path is toggledON and press the OK button.
We need to specify the border we want to use on our plan sheet. We will do this by selecting the appropriate model to reference.
7. In the Model portion of theReference Attachment Settings dialog, selectStructures. 8. In the Orientation portion of the dialog, select the Top Standard View.
9. Set the Scale (Master:Ref) field to reflect our 1”=1’ scale plan sheets type 1 in the first scale field and hit the TAB key on your keyboard.
10. Ensure the True Scale toggle is ON.
11. Set the Nested Attachments option to Copy Attachment and the Depth to 1. The dialog should look similar to the one shown below:
SHA_V8_2.01 2/22/2005
Chapter 4: Reference Files 12. Press the OK button.
13. Place the border in the file and move if necessary. 14. Fit the MicroStation View.
