Dear Sirs,

I'd like to know how CAESAR II calculate the SIF of fittings using UKOOA, are there any reference on this?

The worst thing is I don't have any copy of UKOOA.

Lastly, why FRP's are evaluated on SUS, OPE, and OCC only? what is the reason behind why EXP is not included?

Regards,
Clyde

UKOOA uses the formulas from BS7159 to calculate the SIFS.

For steel, we use the EXP case to evaluate secondary stresses. We allow some plastic deformation here.
Ask yourself is this is useful for FRP. Can this material have plastic deformation?

Before doing FRP analysis, please first familiarize yourself with the material, its properties and behaviour.

Do a search on this forum to find more info.

Thanks corne, how about ISO14692, are there any diffrences between UKOOA and ISO 14692? I heard that its almost same but I havnt read the ISO 14692.

And also, can you explain how to use ISO 14692 in CAESAR II if you know. Once again, thanks!

I don't have the codes here, but if I'm not mistaken there is a small difference in SIF calculations between UKOOA/BS7159 and ISO 14692. It has to do with different types of tees I thought.

Using ISO 14692 in CAESAR II is almost the same as UKOOA, only that now you have to enter some points from the stress envelope of the material, and not the LTHS only.

There is a good instruction document about ISO 14692 in combination with CAESAR II, but I don't know if that is an Intergraph interal document (I once got it from one of the Coade people discussing ISO 14692 implementation) or that it is publicly available.

Dear sir,

Kindly clarrify my doubts.

1.
I am doing HDPE ug pipeline stress analysis which is 300 km of single lline. I want to know that,whether i should model as single line, why i am asking because the 300 km line of my model looks lengthy and very small and difficult to track the node.pls clarrrify.

2.

I am using Ceasar 5.2 . Presently i am doing Stress analysis for High density polyethlene pipes.. In which this material is not available in caesar, still i am trying to use user defined option in material . In that this portable water line , when i select B31.4 as standard the allowable stress space all becoming blank.. Kindly guide me how to defined allowble stress under B31.4

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*by*
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*Chakkravarthy*

Really, can you send the document to my personal email if you don't mind. I don't have document regarding ISO 14692.

cliffhanger0913@yahoo.com

thanks and regards.

@Chakkravarthy: You are completely off-topic here. Please do a search on thermoplastic or PE in this forum and see a lot of topics about PE-stress analysis (or why not to do it).

@Clyde: as I don't know if it is an Intergraph internal document or not, I will not forward it to you. Please ask your local distributor for the document or contact Intergraph about it.

Ok, its all right. Now i've got the ISO 14692 document, ive noticed that caesar II needs the long term axial strength under no internal pressure and with internal pressure for the determination of bi-axial ratio that is needed in failure the envelope as per ISO 14692.

Then it seems like the qualified stress,Qs in ISO 14692 is same as the LTHS in the UKOOA code. Qs (ISO 14692) = LTHS(UKOOA)

Can somebody clarify these? are there any difference?

Yes, it is the same value. I believe there are some small differences in the method used to determine this value, but I'm not sure about that.