is necesary include the operational temperature of de fluids in occasional loads using b31.1 code.

Your answer is found by actually reading the ASME B31.1 code. Caesar just follows the rules of whatever code you tell it to base its analysis work on.

Your question seems typical of people who confuse CAE programs for code books. I suggest a thorough study of this code before putting together any more beam element models.

"Many can cut few are surgeons"

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Best Regards,

John C. Luf

The code equation for "stresses due to occasional loads" is:

pd/4t + .75i*Ma/Z + .75i*Mb/Z <= k*Sh

If we group terms as follows:

(pd/4t + .75i*Ma/Z) + .75i*Mb/Z <= k*Sh

we see that the code is asking for the combination of sustained stresses with occasional stresses.

As a simple example is the case of a linear system exposed to wind. The appropriate load cases would be:

1) W + P1 + T1 (OPE)
2) W + P1 (SUS)
3) WIN1 (OCC)
4) DS1 - DS2 (EXP)
5) ST2 + ST3 (OCC)

It is case #5 that statisfies the code equation above. Case #3 is just a construction case. Notice that temperature does not enter into cases 2, 3, or 5.

For non-linear systems, you can't set case #3 up as I have shown above. Instead you have to take the difference of two operating cases to get the effects of the occasional load. This procedure is detailed in the CAESAR II documentation.


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Regards,
Richard Ay (COADE, Inc.)

Read the attachment which of course is the only logical answer that the comittee could give!

Thus, both of you are correct; Sustained & occassional allowable stresses Sh and 1.33*Sh change with temperature - also for nonlinear cases with friction, Y+ supports and gaps in guides,limit stops & single sense guide/limit stop - temperature affects the computed/allowable stress ratio & guide/limit stop load both.

Luf Sir has aptly commented; many of us, keyboard pushers, outsource activities like reading code to Caesar discussion forum or software.

regards,

sam