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The last time I looked to STAAD-III for time-history analysis, I found that the
program limits you to a maximum of 99 time steps.  This may be adequate for one
or two of the degrees of freedom but not for all six.  When I asked REI if there
was a way to use more than 99 time steps, they gave the standard REI response,
"Why would you want that?"  Therefore, I've never tried to use STAAD-III for
such problems.  If REI has increased the number of time steps, I would still be
leery, since not many people have used that portion of the program.

Bill Polhemus <bpolhem(--nospam--at)> wrote:
>The programs you mention will do time-history analysis. It is a bit more
>time-consuming than it would be to use software that is already set up for
>steady-state, but not appreciably so since I use spreadsheets etc. to help me
>create the data sets.
>Tom.Hunt(--nospam--at) wrote:
>> Victor,
>> Computer programs such as RISA and STAADIII will not help since
>> they do not do study state harmonics which is much different than seismic
>> dynamic analysis.