LARSA 4D Introductory Training Manual for Bridge ... - LARSA, Inc.

LARSA 4D Introductory Training Manual for Bridge Projects
The First Structure Group
Click the Add Group button in the Structure Groups Explorer to add a new group for the
selected structural objects.
The new group automatically contains the currently selected members (and joints, but this will not
be relevant).
Click on the group and rename it to “Span 1 Segment 1”.
Do the same for the remaining three segments: Unselect All, window select the segment, add a
group, and then rename the group. Include the pier in Span 1 Segment 2, and include the right
abutment in Span 2 Segment 2.
When you are done, select all geometry.
Structure Groups
Construction Loads
Each condition of temporary or traveler construction loading must be defined as a load case. We will
create four temporary loading conditions, which will be point loads at the mid-point of each girder
segment. Each temporary load will be applied when the segment is first constructed and will be
removed when the entire span is complete.
To identify the members we will place the temporary loads on, use the Pointer mouse tool. The Pointer
tool is the fourth tool (the one to the left of the selection tool) in the figure above showing the graphics
mouse tools.
Turn on the Pointer tool and hover over the middle member in each segment. Hold the CTRL
key while hovering the mouse over the members to see the member numbers, or look in the
status bar at the bottom of the screen.
The members should be 4, 9, 13, and 18.
Identify the two joints where we will need temporary supports (between the segments).
The joints should be 10 and 19.
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