#49620 - 07/05/12 12:25 AM
Spectrum Definition For Doing DYNAMIC ANALYSIS
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Dear ALL,
For doing Dynamic analysis
We are Defining the Spectrum in the SPECTRUM DEFINITION.
In Spectrum Definition, The user has a option for selection of Range Interpol and ORDINATE interpol in that on what basis i have to decide whether i have to select LINEAR (OR) LOG..
Thanks, Durga.
Edited by durga (07/05/12 12:26 AM)
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Thanks, Durga
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#49624 - 07/05/12 03:48 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 12/16/99
Posts: 246
Loc: Mannheim,Germany
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This information must be from your spectrum.
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#49627 - 07/05/12 05:58 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Ohliger,
can you please Eloberate ..
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Thanks, Durga
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#49629 - 07/05/12 07:23 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 12/16/99
Posts: 246
Loc: Mannheim,Germany
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Example : If you have a pre definded spectrum from a seismologe then the acceleration and frequencys are log or lin in the ordinate /range. So you give this interpolation methode in your input.
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#49641 - 07/05/12 09:26 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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hello Ohlinger, Good morning.
So, user spectrum should be in this manner..
RANGE:
10 100 1000 10000
ohlinger give me one example spectrum, where you used LOG in for selection of Range Interpol and ORDINATE interpol
Edited by durga (07/05/12 09:33 PM)
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Thanks, Durga
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#49645 - 07/06/12 02:58 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 12/16/99
Posts: 246
Loc: Mannheim,Germany
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You must self know is your Range log or lin presentation. Normaly it is lin.
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#49647 - 07/06/12 06:14 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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yes, normally it is linear
till now we used linear only but where LOG ??
iam not getting that..
_________________________
Thanks, Durga
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#49656 - 07/06/12 06:57 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 12/14/99
Posts: 2382
Loc: Houston, TX, USA
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The USNRC Reg Guide 1.60 spectra were, are log-log. The B31.1 Appx.II DLF spectrum is log-lin or lin-log, whatever.
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Dave Diehl
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#49660 - 07/06/12 09:21 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Dave,
Thanks for your reply,
CAESAR provides some Inbuilt spectrums like 1.60 spectra, Elecentro etc..
I didnt find these spectrums in CAESAR INSTALLATION place..
can i know where these spectrum are available?
_________________________
Thanks, Durga
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#49666 - 07/06/12 10:05 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
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Those spectra are data built into the program (EXE), this data does not exist in an external file.
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Regards, Richard Ay - Consultant
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#49684 - 07/08/12 09:44 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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In Spectrum Definition, The user has a option for selection of Range Interpol and ORDINATE interpol in that on what basis i have to decide whether i have to select LINEAR (OR) LOG..
can any one give me reference about LOG or LIN, how to select..
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Thanks, Durga
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#49700 - 07/09/12 11:09 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 09/29/07
Posts: 798
Loc: Romania
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If I understand well, your main question is "on what basis i have to decide whether i have to select LINEAR (OR) LOG".
I think you don't need to decide such things except cases in which you construct completely your own spectrum, I mean you consider your spectrum instead to take one from a document.
For example, just open REGULATORY GUIDE 1.60 "DESIGN RESPONSE SPECTRA FOR SEISMIC DESIGN OF NUCLEAR POWER PLANTS" and see FIGURE 1/HORIZONTAL DESIGN RESPONSE SPECTRA" where spectrum (graph representation) is log-log.
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#49708 - 07/10/12 02:26 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Thanks marioq.
I will go through it once..
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Thanks, Durga
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#49738 - 07/11/12 03:58 AM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Good morning Marioq,
I have seen that graph, still iam in confusion mode..
Can you give me any simple example spectrum..
LINEAR means straight line, or LOG means CURVE like that..
kindly give me one simple example....
_________________________
Thanks, Durga
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#49758 - 07/11/12 11:43 PM
Re: Spectrum Definition For Doing DYNAMIC ANALYSIS
[Re: durga]
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Member
Registered: 06/18/12
Posts: 345
Loc: India
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Its clear
Thank you
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Thanks, Durga
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