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STAAD Commands and Input Instructions
Section 5
5-334
5.35 Load Combination Specification
Purpose
This command may be used to combine the results of the analysis.
The combination may be algebraic, SRSS, a combination of both,
or ABSolute.
General format:
⎧SRSS ⎫
LOA
D COMBINATION ⎨ABS ⎬ i a
1
⎩
⎭
i
1
, f
1
, i
2
, f
2
... (f
srss
)
i = Load combination number ( any integer smaller than
100000 that is not the same as any previously defined
primary load case number.)
a
1
= Any title for the load combination.
i
1
, i
2
... represents the load case numbers which are to be
combined.
f
1
, f
2
... represents corresponding factors to be applied to loadings.
A value of 0.0 is also allowed.
f
SRSS
= optional factor to be applied as a multiplying factor on the
combined result of the SRSS load combination (see
examples below).
If the last character on a line is a hyphen, then the command is
continued on the next line. A limit of 550 prior cases may be
factored in one command.
Notes
1) In the LOAD COMBINATION SRSS option, if the minus
sign precedes any load case no., then that load case will be
combined algebraically with the SRSS combination of the
rest.