Thread: How to choose frequency for structural analysis

Started: 2014-06-11 22:29:38
Last activity: 2014-06-12 17:48:16
Topics: SAC Help
Cuiyan Kong
2014-06-11 22:29:38
Hi friends,

I am trying to obtain the accelerogram by removing the instrument response
which need to be defined the freqlimit. May I know how to select the
freqlimit for structural analysis? Any help would be appreciated. Thanks a
lot.


Tracy

  • Sheila Peacock
    2014-06-12 17:48:16
    On 06/11/2014 08:29 PM, Cuiyan Kong wrote:
    Hi friends,

    I am trying to obtain the accelerogram by removing the instrument response which need to be defined the freqlimit. May I know how to select the freqlimit for structural analysis? Any help would be appreciated. Thanks a lot.


    Tracy


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    Dear Tracy,

    Have you plotted some spectra of typical traces to see
    what the usable bandwidth of your data is? Use:

    rmean
    rtrend
    taper
    fft
    plotsp

    (or keepam then plot1 instead of plotsp)
    (you might find the spectra better to view if you
    issue "loglog" before the plot commands, to get
    logarithmic scales on both axes).


    Regards,
    Sheila Peacock.

12:16:15 v.e73c6799