OpenBridge Modeler

Beam Definition dialog

Used to specify beam parameters such as section, material, etc for beams within a beam layout.

Opens when a beam layout is selected using the Place Beam Group tool.

Dialog Settings

Beams list A list of all beams in the selected beam layout is included here.
Right-click and select Copy To to open the Beam Copy dialog. This can be used to copy the current beam parameters to other beams by:
  • the beam identification by supportline and beam location
  • distance
  • ratio
Note: Set the Apply To All Beams check box to apply the parameters to all beams in the beam layout. The Beams list is inactive when this option is set.
Beam Sections Select the type of sections to use for the selected beam. The options vary for concrete or steel girder bridge types:
  • Beam Slab (P/S or RC Concrete Girders):
    • LEAP Concrete A list of the standard precast beam profiles included with LEAP Bridge Concrete. These shapes cannot be spliced.
    • Custom A list of standard precast beam profiles from OpenBridge Modeler
  • Beam Slab (Steel Girders):
    • Rolled Shapes — Select from the Section Property Catalog list of AISC wide flange shapes.
    • Built-Up — Define a built-up plate girder with optional cover plates. Tapered web depth and flange widths may be used.
Beam Haunch (Concrete Girders)

In order to position the prestressed concrete beams accurately, and subsequently obtain accurate elevations for all substructure components, including bearings, bearings seats and piers, OpenBridge Modeler allows you to input the beam haunch at the center of the beam for both the start and end of each beam. If no bearings are input, the haunch thickness is modeled at the start and the end of the beams. However if the bearings are input, the haunch thickness input is considered at the bearing lines instead.

If the Compute option is checked, you can input a minimum clearance value and a residual camber value at erection, and the program will automatically compute the Haunch thickness values at both start and end of the beam. Minimum clearance is measured at the edge of the beam flange, and is verified all along the beam length.

Options to copy the values from one beam to others is also available.

Diagram showing location of measurement of Beam Haunch at along beam at start and end

Beam Haunch is measured at the center of the beam

Note: At this time, the prestressed beams are not drawn with the initial camber (due to prestress+Self weight), but only modeled straight across.
Beam Haunch (Steel Girders) Set this option and type a value to specify beam haunch with this minimum height. The minimum is considered for each beam, or can be set to be the same for all beams. The minimum haunch is measured at the left or right edge of the top flange. The haunch is expanded vertically from the beams to the bottom of the deck profile automatically.
Note: In both OpenBridge Modeler and in LEAP Bridge Steel, haunch thickness is measured from the bottom of the top flange to bottom of deck for steel girder bridges.
Rotation Angle Precast Beams can be defined plumb or with a rotation angle to follow the slope of bottom of the deck. This field displays the Calculated rotation angle of the beam, if rotation option is selected. You can specify a custom angle by selecting the Override option and typing an angle value.
Automatically Sort Rows Set this option to automatically sort the rows based on the distance definitions so the sections are ordered along the span length from top-to-bottom of the table.
beam rows The rows in table represent segments of the beam along the selected beam/span. If only one row is present, then that definition is used for the entire span length. However, you may add additional rows (except for LEAP Concrete sections) to represent beam splices or other changes in material or section.

Click Insert Row After () or Delete Row () to control the rows added to the table.

If the Different End Template option is checked, you can specify a different beam section, and OpenBridge Modeler will loft the solids linearly for the section Length. Both start and end templates need to have the same number of points and start location of points for the loft to be created.

Drawing You can expand or collapse the drawing panel. This shows you an elevation and section view of the current beam's section.

If a section is nonprismatic, you can use the slider control to select a point along the section length.