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Section 5
5-335
2) The total number of primary and combination load
cases combined cannot exceed the limit described in
section 5.2 of this manual.
3) A value of zero (0) as a load factor is permitted. See Notes
item (3) later in this section for more details..
Description
LOAD COMBINATION
Results from analyses will be combined algebraically.
LOAD COMBINATION 6 DL+LL+WL
1 0.75 2 0.75 3 1.33
LOAD COMBINATION ABS
Absolute value of results from the analyses will be combined.
LOAD COMBINATION ABS 7 DL+LL+WL
1 0.85 2 0.65 3 2.12
LOAD COMBINATION SRSS
Results from analyses may be combined both algebraically and
using the SRSS (Square Root of Summation of Squares) method.
The combination scheme may be mixed if required. For example,
in the same load combination case, results from load cases may be
combined in the SRSS manner and then combined algebraically
with other load cases. Note that the case factor is not squared
.
If some of the factors are negative, then the sum of the factored
squares may become negative. If negative, the SQRT will be of
the absolute value and the result of the SQRT will be set negative.
Refer to the following examples for illustration -
Example
Several combination examples are provided to illustrate the
possible combination schemes -