OpenBridge Modeler

To define a steel built-up beam

To add a beam definition for a slab with steel girder bridge that uses built-up sections, use the following procedure.

You must have previously created a beam layout and placed a beam group.
Once the Beam Definition dialog is open for a slab on steel girder bridge, you can define built-up steel beams.
  1. Select a beam in the Beams list.
  2. Select Built-Up from the Beam Sections drop-down. A drop-down list with the built-up section components (i.e., web, flanges, cover plates) appears to the right.
  3. (Optional) Type a Beam Minimum Haunch height.
    Note: You can uncheck this option for steel girders if a minimum haunch is not necessary.
  4. Define the web dimensions:
    1. Select the Web from the drop-down list of built-up section components.
    2. Type the web thickness.
    3. Type the Start Value and End Value for the web depth. These can vary along the length to taper the web depth.
    4. For varying web depths, select the Variation method.
    5. Select the web Material.
  5. (Optional) Click Insert Row After () to add rows to create changes in the web thickness or splices along the span length. For each row, you will need to define the web dimensions as well as the distance to the point of change.
  6. Define the flange dimensions:
    1. Select the Top Flange from the drop-down list of built-up section components.
    2. Type the flange Thickness.
    3. Type the Start Value and End Value for the flange width. Flange width is centered on the web.
    4. For varying flange widths, select the Variation method.
    5. Select the flange Material.
    6. Select the Bottom Flange from the drop-down list of built-up section components and then repeat steps 5b through 5e for the bottom flange.
  7. (Optional) Click Insert Row After () to add rows to the top flange and bottom flange tables as needed to create changes in the flange thickness or splices along the span length. For each row, you will need to define the flange dimensions as well as the distance to the point of change.
  8. (Optional) Define the cover plate dimensions if cover plates are required for top or bottom:
    1. Select the Top Cover Plate from the drop-down list of built-up section components.
    2. Click (+) to add a top cover plate in the beam span.
    3. Specify the distance, From, Ratio, and Lock To values for the start of the cover plate.
    4. Type the Section Length distance for the length of the cover plate.
    5. Type the cover plate Thickness and Width.
      Note: Cover plates cannot vary width along the length of the span.
    6. Select the cover plate Material.
    7. Select the Bottom Cover Plate from the drop-down list of built-up section components and then repeat steps 7b through 7f for the bottom cover plate.
  9. (Optional) Click Insert Row After () to add rows to the top cover plate and bottom cover plate tables as needed to create changes in the cover plate thickness or width or to create splices along the span length. For each row, you will need to define the cover plate dimensions as well as the distance to the point of change.
  10. Either:

    select a different beam in the Beams list to define it

    or

    copy a beam definition to other beams

  11. Once you have defined all the beams in the layout, click OK.
The Beam Definition dialog closes and the beams are added to the model.