Hello Stressers

I have simple question.
Is CII inform during the calculation that some supports on instalation are lifting up in OPE parameters (does not work) ??
Because I have a two identical models one in CII and second in AutoPIPE and in the second one I have this information.
And second question it is possible that in the same systems with the same paramteres the results differ about 15% - it not to high difference ???

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Regards Adrian

Sorry for duplicate the topic about lift-up

But the second part is different !

Someone can help me ?

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Regards Adrian

I believe if you visit the AutoPIPE website, they admit they use a different calculation method than Intergraph does and thus achieve similar, but still different results.

In the past, I've received results from AutoPIPE that I could not exactly replicate within CAESAR, with CAESAR resulting in more conservative results.

Unfortunately, I can't be of further help.

Thank You Michael for answer and help.

I was working on AutoPIPE for many Years and now from two I work on CASEAR II.

I heard that they use a different calculation method but if I checked a system acc. EN 13480 or different Code the formulas are the same.
The material have constant value for temperatures in Standards.
So in my opinion You have right never the results will be the same but a differ on the level 10 and more percent is in my opinion to large.

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Regards Adrian

Hi Adrian,

About 10 years ago when I bought a book "Matrix Analysis of Structures by: Aslam Kassimali". It's a very good book where you can study from the basic Matrix Algebra up to solving some problems like plane trusses, beams, plane frames and space frames. Then from there you can check results from a beam analysis program like Caesar II, Autopipe, Caepipe, and compare your results from manual calculation. You can appreciate more the software you are using if you can do some simple hand calcs and compare it with the result from any program you are using. Basically, the software is a very powerful tool to solve thousands to million of equations simultaneously thru algorithms. And if you feel your hand calcs are almost the same with the software results then you will feel confident to do the more complex ones. As we know Finite Element Analysis now is becoming more common in different industries but as a user it's always good to first validate the results from some simple hand calcs. Then maybe you can trace the 10% to 15% difference, mostly if the problem is non-linear maybe some settings need to set the same for both software. So my suggestion is for you start from a simple linear analysis and step by step you proceed to non-linear analysis and check some settings like Force or displacement tolerances, etc.

Cheers!!!

Michael
Thanks for Your advice.
I will try to calculate some simple system, and after this check the results with CII and AP.


Regards

Like Borzki says, examples of where you might see difference between the two software results may be caused how each handles friction, for example, or the algorithm used to select and simulate springs, etc.

Since you have the same model in two different formats, besides validating lengths and weights, I suggest looking in these particular places.

Yes I checked it. It was first I did.
Because I think at the begining that maybe I have a difference in friction or maybe in type of supports and their location.
But everything is okey.
Thanks for this suggestion