topic Re: Execution Problem 2809 in Robot Structural Analysis Forum

Execution Problem 2809

Anonymous — Thu, 04 Apr 2013 20:25:58 GMT

Greetings Everybody.

Im trying to model a pipe support in RSA2013, such as the linear example attached, where i wrongly model cables as simple bars.

The problem is when i try to change them for cables, model goes berserk and says "execution problem 2809" as in file attached non linear example.

Pls some advise for modeling these cables..

Re: Execution Problem 2809

Artur.Kosakowski — Fri, 05 Apr 2013 06:51:32 GMT

In the definition of the cable you should type 0 as the relative elongation rather than the length of the cable itself.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Execution Problem 2809

Anonymous — Mon, 08 Apr 2013 20:14:30 GMT

Thx for your response,

now the model seems to run fine, but says the attached warning at the end of calculation

Besides i´d like to know how to check de capacity of the cable used.

Thx for your efficiency.

Re: Execution Problem 2809

Artur.Kosakowski — Tue, 09 Apr 2013 07:15:56 GMT

For non-linear models you cannot use automatic code combinations and you should replace them with the manual ones. I'm not sure what you mean by 'capacity' of cables but you can check axial forces in these elements.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Execution Problem 2809

Anonymous — Tue, 30 Apr 2013 21:09:45 GMT

Ok, the model above went right after all the corrections you suggested, now i have the following model and the same problem..

the idea is having a main cable, which connects with small cables the pipe. i get the same problem and a bunch of instabilities.

Thx for your last Response.

Re: Execution Problem 2809

Artur.Kosakowski — Thu, 02 May 2013 07:29:51 GMT

1. Change analysis type to P-Delta

2. Use full Newton-Raphson method

3. Modal analysis should not be used for nonlinear models

These points have already been discussed on this forum

Re: Execution Problem 2809

Anonymous — Thu, 02 May 2013 12:28:25 GMT

ok Thx for Response!

Regards!

Re: Execution Problem 2809

Anonymous — Thu, 02 May 2013 16:47:35 GMT

I attached the model with what i think is the correct way of correcting it.

But when i delete modal analysis, i cant (or dont know how) check the seismic spectral analysis for the structure, so what do i do??

P.S: i am sorry to disturb with many dumb questions but i am starting to get into calculations and im not as xpert as you guys are.. i little or none knowledge of P-Delta or Newton-Raphons stuff.

Regards.

Re: Execution Problem 2809

Artur.Kosakowski — Mon, 06 May 2013 09:30:59 GMT

Please check:

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Uplift-Elimination/m-p/3744231