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Section 1
1-95
1.20 Multiple Analyses
Structural analysis/design may require multiple analyses in the
same run. STAAD allows the user to change input such as member
properties, support conditions etc. in an input file to facilitate
multiple analyses in the same run. Results from different analyses
may be combined for design purposes.
For structures with bracing, it may be necessary to make certain
members inactive for a particular load case and subsequently
activate them for another. STAAD provides an INACTIVE facility
for this type of analysis. The INACTIVE option is discussed in the
following paragraph.
Inactive Members
With the INACTIVE command, members can be made inactive.
These inactive members will not be considered in the stiffness
analysis or in any printout. The members made inactive by the
INACTIVE command are made active again with the CHANGE
command. This can be useful in an analysis where stage
construction is modeled due to which, a set of members should be
inactive for certain load cases. This can be accomplished by:
See section
5.18
a) making the desired members inactive
b) providing the relevant load cases for which the members are
inactive
c) performing the analysis
d) using the CHANGE command to make all the inactive
members active
e) making another set of members inactive and providing the
proper load cases for which the members are meant to be
inactive, performing the analysis and repeating the procedure
as necessary