Beam Sections
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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.
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Beam Haunch (Concrete Girders)
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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 Haunch option is set to "Start, End, Mid", a new
field to input Haunch value at midspan is available. Utilizing these three
values, the beam is drawn with this camber, and a more accurate haunch volume
of concrete is computed.
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
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Beam Haunch (Steel Girders)
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Type a
Minimum Haunch height. Minimum
Haunch Height is measured at the CL of beam (in beam cross section). For both
the left and right haunches of each beam, define the left and right extensions,
and the edge type (Chamfered or Normal). For exterior beams, you can chose the
option to "Follow Deck Edge" in which case, the haunch width automatically
extended to follow the respective deck edge, to facilitate the modeling of
thickened deck edges. An optional value for Deck Edge Vertical Offset can also
be input, so the thickened portion of the deck can be modeled.
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.
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Rotation Angle
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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.
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Automatically Sort Rows
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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.
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beam rows
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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.
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Drawing
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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.
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