Modal Combination Method
SRSS
(Square Root of the Sum of the Squares)
SRSS method, which is
most commonly used, renders close approximations of design response for
a structure exhibiting well-distributed natural frequencies. However,
it tends to overestimate or underestimate the combination for a structural
system with close natural frequencies.
CQC
(Complete Quadratic Combination)
CQC method considers
the probabilistic correlation between modes for a structural system with
close natural frequencies. The overestimating or underestimating problem
of SRSS can be resolved.
ABS
(Absolute Sum)
ABS method renders the
largest responses among different combination methods. The signs are neglected
by the use of absolute values. It tends to overestimate the response results.
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