Different load (analysis) cases can retain separate boundary conditions
within a model. Even
in the case where static analysis and dynamic analysis are associated
with different boundary conditions, the two analyses can be carried out
within a same model without having to make two different model files.
Analysis procedure for assigning different boundary conditions to Load
Cases/Analyses is as follows:
1. Define as many Boundary Groups as required
for different load cases or analyses, in Model>Group>Define Boundary
Group.
2. Define Boundary Conditions and Load Cases.
3. Apply Loads.
4. Assign different Boundary Groups to Load
Cases/Analyses using 'Boundary Change Assignment to Load Cases/Analyses'.
5. Perform analysis.
6. Review analysis results.
From the Main
Menu select Analysis
> Boundary Change Assignment to Load Cases/Analyses.
Boundary Change Assignment to Load Cases/Analyses dialog
box
Data Selection
The types of defined boundary conditions,
which can be applied to different load cases, are listed.
Note
One boundary condition type "Beam End Release" has been added.
Boundary Group Combination
Boundary Group List
Boundary condition groups selected in Data
Selection to the left are listed.
If Filter Boundary Group at the bottom is not checked, all the boundary
condition groups are listed.
Name
Name a Boundary group combination, which
will be applied to a load case. Having
named a Boundary group combination, select desired boundary groups from
Boundary Group List, and click to create a Boundary group
combination. Multiple
Boundary group combinations are thus created, each of which is assigned
to each load case. A
separate analysis can be then performed for each load case with its own
Boundary group combination.
Load Cases & Analyses
Load combinations of static analysis and
analysis types are listed. In
the case of static analysis, click to expand the table and
list the static load cases defined by the user.
Boundary Group Combination
Select a Boundary group combination (by clicking
in the right end of the entry field) to be applied to the static load
case or analysis type to the left. If
Unchanged is selected in a construction stage analysis, the boundary condition
corresponding to the final construction stage is used. If Unchanged is
selected in an analysis without construction stages, all the entered boundary
conditions are used.
Constrain DOF associated with Specified Displacements/Settlements
by Boundary Group Combinations
In a Specified Displacements or Settlements
analysis, the degrees of freedom at the corresponding nodes are internally
constrained and treated as supports, and forced displacements are assigned.
If this
option is selected (checked on), the internal DOF constraints are included
in only the boundary group combination corresponding to the Specified
Displacements/Settlements.