Creating Arbitrary Sections - PDS - Help

Interactive Section Tables Help

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This option is used to create cross-sections for arbitrary members and add them to the active section table. IST calculates the engineering properties of the arbitrary sections you create and stores them in the active table. The cell file that is created of the cross-section is stored in the active cell library.

During the creation of arbitrary sections, thinwall sections, and volumes, the user can choose to create a designator. A designator is a symbol (triad) that is associated with the graphics used to create the section. Designators can be labeled with the section name. The properties associated with the designator can be reviewed by simply selecting the designator. When a designator is created, it is placed at the center of the section and indicates the directions of the principle axes of the section.

Before Using This Option

  • Use MicroStation to draw the arbitrary section. You can use ellipses, shapes, or complex shapes made up of lines, arcs, and line strings. The cross-section must be drawn to scale. You can create the graphic is 2-D or 3-D, in any view, on any level, using any weight and color.

    The shape is invalid if any of the lines cross.

  • Place a fence around the graphic. If you are in a 3-D design file, you must place the fence in the view in which the graphic was created.

  1. Click Section > Create.

  2. Select the arbitrary section icon from the Section Type option.

  3. Type in a name for the arbitrary section to be created. The name can be up to 40 characters long.

  4. Click the Create Volume Designator check box if you want to include this option.

    When a section is associated with an area designator, it is considered to be locked. To unlock the section, you must use the Designator - Disconnect command.

  5. Click Create.

    IST prompts: Place Fence Block Enter first point

  6. Place a fence around the MicroStation graphics you have created to define the cross-section.

    The first element of the selected graphics is highlighted.

  7. Click Create.

    IST prompts: DB: Solid; RST: Hole

  8. Click data point to define the highlighted graphics as a solid element.

    The next element in the fence is highlighted. This step is repeated until there are no more elements in the fence to define as solid or hole. The message Record Added to Table is displayed when this process has been completed.

  9. Click reset to define the highlighted element as a hole.

    The next element in the fence is highlighted. This step is repeated until there are no more elements in the fence to define as a solid or hole. The message Record Added to Table is displayed when this process has been completed.

  • IST does not check the validity of the solids and holes used to create the arbitrary sections other than to verify that at least one solid section exists.

  • Processing of sections with curves can take considerably longer than sections without curves.