> Is there any other parameters (other than mass participation) by which
> we can find contributing mode in the direction of earthquake.
Here's an idea: look at the shape that a "Rayleigh-Ritz" analysis gives
you, and try those signs.
(N.B. I agree with the folks here earlier who stated that you apply both
positive and negative signs when you include the RSA effects in your
load combinations. I know that RISA allows you to do this quite handily,
for instance).
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