OpenBridge Modeler

To add a depth constraint

To add variable depth along the length of the segmental bridge, with maximum depth over the interior piers, do the following.

  1. On the Home ribbon tab, select the Constraints tool in the Superstructure group


    The Edit Constraints dialog opens.
  2. Click Edit in the cell adjacent to the SegBox0600 entry. The Solid Constraints Definition dialog opens.
  3. In the Variables drop-down list, select total_depth and then click Add.
    Tip: Select the Variation tab to display the variation of the selected variable along the length. The graphic shows the curve upside-down in comparison to the bottom flange of the final bridge.
  4. Set the depth variation in the first span:
    1. In the emtpy row, type 4.700 in the End Value cell.
    2. Select Parabolic Start in the drop-down list in the Transition cell.
  5. Set the depth variation in the middle span:
    1. Click the Add button () to add a 2nd row to the table.
    2. Select SupportLine2 in the drop-down list in the From cell of the 2nd row.
    3. Type 0.000 in the Relative Location cell.
    4. Type 4.700 in the Start Value cell.
    5. Select Parabolic End in the drop-down list in the Transition cell.
    6. Click the Add button () to add a 3rd row to the table.
    7. Select SupportLine2 in the drop-down list in the From cell of the 3rd row.
    8. Type 100.000 in the Relative Location cell in the 3rd row (i.e., midspan of the second span).
    9. Type 4.700 in the End Value cell.
    10. Select Parabolic Start in the drop-down list in the Transition cell.
  6. Set the depth variation in the last span:
    1. Click the Add button () to add a 4th row to the table.
    2. Select SupportLine3 in the drop-down list in the From cell of the 4th row.
    3. Type 0.000 in the Relative Location cell.
    4. Type 4.700 in the Start Value cell.
    5. Select Parabolic End in the drop-down list in the Transition cell.
    The resulting table should appear as follows:
    Table 1. Variable constraint total_depth values for Tutorial 3
    Location Type Relative Location From Start Value End Value Transition
    From SupportLine 0.0000 SupportLine1 2.7000 4.7000 Parabolic Start
    From SupportLine 0.0000 SupportLine2 4.7000 2.7000 Parabolic End
    From SupportLine 100.0000 SupportLine2 2.7000 4.7000 Parabolic Start
    From SupportLine 0.0000 SupportLine3 4.7000 2.7000 Parabolic End
  7. Click OK.
  8. In the Edit Constraints dialog, click OK. The segments are regenerated with the varying depth constraints.
You can use the Rotate View tool to move the view about in 3D to view the varying depth applied to the bottom of the section.