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Re: Signs for Response Spectrum Analysis

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Daniel Popp wrote:
Josh,

You rightly say that defining a "dominant" mode requires engineering judgment.  How does RISA-3D define "dominant"?  There is only a checkbox for "Use Dominant Mode for Signage"; the user is not allowed to input a cutoff, meaning that the program must have one internally.

*****
I believe that means "dominant among all the modes used in analysis." If you use the first five modes for analysis, for example, it will use the sign of the "dominant" mode among those five.

At least I'm pretty sure that's the way it works.
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