CAESAR analysis 1

[dbday]

Hi,

I am new to CAESAR and have been looking at static and dynamic analysis of piping.

What I am seeing is lower stress levels reported for a dynamic analysis than for the static analysis on the same system.

The program seems to produce separate reports and not a "composite" report and it is confusing to me when I see 10N/mm2 reported as the dynamic stress and 100N/mm2 for the static stress - all on the same model.

Do I consider the reports in isolation, or maybe add them up, or am I miss-understanding something about how static and dynamic conditions interact.

I know this is basic stuff, so any help would be appreciated.

 

[MJCronin]

"What I am seeing is lower stress levels reported for a dynamic analysis than for the static analysis on the same system."

- Yup.... If your piping model does not respond to the exciting forces, low stresses will be generated. If you are performing a response spectra (earthquake) analysis, make sure that the lumped masses are properly located


"The program seems to produce separate reports and not a "composite" report"

- CAESAR can produce composite stress reports, if desired by the user. What most users do is to evaluate loading conditions against ASME (or other) piping code limits. Static stresses are added to dynamic stresses and the sum is compared to an allowable.

Please tell us about the code under which you are working and explain the specific type of dynamic analysis that you are performing.

Have you discovered the COADE website and its superb user forum ???

MJCronin
Sr. Process Engineer