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Section 5
5-337
Example 2
LOAD COMBINATION SRSS 10
-1 0.75 -2 0.572 3 1.2 4 1.7 0.63
Here, both load cases 1 and 2 are combined algebraically with the
SRSS combination of load cases 3 and 4. Note the SRSS factor of
0.63. The combination formula will be as follows.
v = 0.75 x L1 + 0.572 x L2 + 0.63 1.2 x L3
2
+ 1.7 x L4
2
Notes
1) This option combines the results of the analysis in the
specified manner. It does not analyze the structure for the
combined loading.
2) If the secondary effects of combined load cases are to be
obtained through a PDELTA , Member/Spring
Tension/Compression, Multi-linear Spring, or Nonlinear
Analysis, then the LOAD COMBINATION command is
inappropriate for the purpose. See the REPEAT LOAD
command (section 5.32.11) for details.
3) In a load combination specification, a value of 0 (zero) as a
load factor is permitted. In other words, a specification such
as
is permitted. So, the above is the same as
LOAD COMB 7
1 1.35 2 0.0 3 1.2 4 0.0 5 1.7
LOAD COMB 7
1 1.35 3 1.2 5 1.7