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#17670 - 04/29/08 07:56 PM Time History with PIPENET TM
harry chiu Offline
Member

Registered: 08/01/07
Posts: 20
Loc: China
How to do Time History analysis with the external interface to PIPENET. PIPENET time-force results are transfered to freq-DLF automatically by CAESAR II.

How to input the time-force results? Manually?

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Harry Chiu
A newbie for piping stress analysis

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#17693 - 04/30/08 09:24 PM Re: Time History with PIPENET TM [Re: harry chiu]
harry chiu Offline
Member

Registered: 08/01/07
Posts: 20
Loc: China
No response? By hand is the only way?


Edited by harry chiu (05/01/08 01:21 AM)
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Harry Chiu
A newbie for piping stress analysis

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#17698 - 05/01/08 07:21 AM Re: Time History with PIPENET TM [Re: harry chiu]
Dave Diehl Offline

Member

Registered: 12/14/99
Posts: 2376
Loc: Houston, TX, USA
PIPPENET produces an .FRC file which holds the time/force data for individual pipe runs in the hydraulic model (force is based on the change in pressure along the run). You can use the CAESAR II external interface processor to convert the .FRC data to a force response specrum. Or, you can use it to build your own time history data set. So CAESAR II has both force response spectrum and time history links to PIPENET.
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Dave Diehl

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#72995 - 03/11/19 08:45 AM Re: Time History with PIPENET TM [Re: harry chiu]
Pradyot Mahata Offline
Member

Registered: 02/19/09
Posts: 5
Loc: India
Dear Mr.Dave,

From your statement I interpret to use specific data (chosen) from the .frc file to generate the spectrum and the same to be used in time history. Is that correct or wrong?

If there is any guideline to use pipenet output in time history analysis, could uou please share with me pmahata@mcdermott.com

Facing difficulties to use pipenet output files in caesar.

Thanks
Pradyot

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#73008 - 03/12/19 11:10 AM Re: Time History with PIPENET TM [Re: harry chiu]
Dave Diehl Offline

Member

Registered: 12/14/99
Posts: 2376
Loc: Houston, TX, USA
The .frc file contains two columns of data - time and load. CAESAR II has a processor (under Interfaces) to convert the .frc file to a force response spectrum. (Comment lines start with *.) If you wish to use the time history data directly, you will have to first convert the time column to milliseconds. Once adjusted, that time history data may be attached to your dynamic input as a Time History Definition. Under Name, provide the name of the file but precede the name with a #. For example, for a file named time_history, provide the name #time-history. That file (time_history) should reside in your CAESAR II data folder.
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Dave Diehl

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#73189 - 04/23/19 03:02 AM Re: Time History with PIPENET TM [Re: Dave Diehl]
Pradyot Mahata Offline
Member

Registered: 02/19/09
Posts: 5
Loc: India
Dear Mr. Dave,

Thanks a lot for the reply.

So I understand that the .frc file can be directly used and only thing I have to change the time values from seconds to ms in the frc file.
The file such as Time-history.frc shall remain in the folder containing the CAESAR II file only with adjustment of the time values from second to millisecond.

Another point, our structural team designs the structures for the dynamic restraints(CAESAR II dynamic output) from max resp case( Combined load case). Is this the correct approach because these forces are momentary in nature. Please advise.

Thanks again and I appreciate your guidance on this matter.

Rgrds

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#73202 - 04/29/19 09:04 AM Re: Time History with PIPENET TM [Re: harry chiu]
Dave Diehl Offline

Member

Registered: 12/14/99
Posts: 2376
Loc: Houston, TX, USA
I can't if you MUST use the instantaneous maximum load in designing the structure.
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Dave Diehl

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