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

LARSA 4D Introductory Training Manual for Bridge Projects
Then double-click Add New Step to Stage 1 and change its name to “First Segment”. Do the
same to create the next construction step for the second segment.
After the first two steps, create a third step “Remove Temporary Loads 1”.
Do the same to create the construction steps for the second span (the third segment, the fourth
segment, and “Remove Temporary Loads 2”).
Construction Steps
The next step is to apply construction activities. The first step will include an activity to assemble the
first five member elements.
Change to the Load Cases / Structure Groups tab.
Click the drop-down arrow next to Add Group besides the first construction step and choose
“Span 1 Segment 1”.
Self-weight is not applied during Staged Construction Analysis unless it is explicitly included as an
activity. A self-weight load case should be applied in any step in which elements are constructed, as
in this case. Self-weight will be applied to all and only the newly constructed elements. (It should not
be applied in other steps.)
Click the drop-down arrow next to Add Load Case besides the first construction step and choose
“Self Weight”.
Simultaneously we will apply the first temporary load.
Click the drop-down arrow next to Add Load Case below “Self Weight” and choose “Temporary
Load 1”.
For the Second Segment step, do the same: add the Span 1 Segment 2 group, self-weight (again),
and Temporary Load 2.
To remove the temporary loading in “Remove Temporary Loading 1”, we will apply the same load cases
again but with opposite sign. (When loading lasts just a single construction step, there is another way
to make loads temporary. Rather than applying them with opposite sign in the next step, the step can
be marked as containing temporary loading only.)
Add Temporary Load 1 and Temporary Load 2 as load cases into the first removal step. We will
reverse their sign later.
Repeat this process for the second span.
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