Problem about dynamic Analysis Time and NumSteps ?

[yones]

Dear all,
I have a quesion about dynamic Analysis Time.
when we have Uniform Excitation pattern with acceleration record file , the analyze command is define as:

analyze $NumSteps $DtAnalysis

where "NumSteps" is number of steps and "DtAnalysis" is time-step increment .
if we assume that data number of acceleration record is 2000 and time of steps is 0.02 second (time of ground motion : 2000*0.02=40 sec)

How we define the analyze command($NumSteps and $DtAnalysis) ?

Thanks.

[tazarv]

As far as I know, these two are totally different. In OpenSees you have the option of two different input and output format. For example, your input acceleration is 2000*0.02=40 sec. However, output can be totally different such as 4000*0.01=40 or 2000*0.005=10sec or 3000*0.02=60sec, it can be anything. But you should notice that after 40sec of input acceleration, analysis will be free vibration.

Bests,

[yones]

tazarv wrote:
> As far as I know, these two are totally different. In OpenSees you have the
> option of two different input and output format. For example, your input
> acceleration is 2000*0.02=40 sec. However, output can be totally different
> such as 4000*0.01=40 or 2000*0.005=10sec or 3000*0.02=60sec, it can be
> anything. But you should notice that after 40sec of input acceleration,
> analysis will be free vibration.
>
> Bests,

hi tazarv ,
thank you very much.