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Registered: ‎12-04-2011
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problem de convergence - analyse de semelle

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11-21-2012 11:03 AM

 

Hi,

 

I am trying to run a "Analyse Non Lineaire" on a model that include seismic loading. (see attached)

 

I have some problems :

- I have around 10 on 47 seimic combination that have NO "convergence"

- I don't no if there is a report where the calculation errors are written on to debug

- the seismic cases without vertical dead load is "converging". No sense.

- the ground reaction presure is not true on combination that includes seismic loads (I found manually unfavorable presure)

 

 

Thanks for helping

 

 

Cdy

 

 

Active Contributor
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Registered: ‎12-04-2011

Re: problem de convergence - analyse de semelle

11-21-2012 08:47 PM in reply to: antoine.carimalo

Sorry it's fine now,

 

I had a problem on my Newmark combinations.

 

Somebody now why when modal sismic analysis is running on a non linear model the combination are linear for all of those that includes sismic case.

 

Combination without modal sismic cases inside are non-linear combinations.

 

Other problem : the seismic cases : Robot doesn't take into acount the uplift free in these loading cases, isn't it?

 

I think Robot is wrong. It is very dangerous.

 

I can I solve the problem? Maybe If I convert manually each load into an horizontal static load for run my model in static non-linear only?

 

I attach the last model for exemple

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Registered: ‎12-17-2010

Re: problem de convergence - analyse de semelle

11-21-2012 11:36 PM in reply to: antoine.carimalo

Please read:

 

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Uplift/m-p/3320823/

 

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Barre-de-treillis-traction-compression-vs-s%...

 

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.



Artur Kosakowski
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Registered: ‎12-04-2011

Re: problem de convergence - analyse de semelle

11-22-2012 07:36 AM in reply to: Artur.Kosakowski

Hi,

 

 

It is exactly what I need to confirm my doubts.

 

Thanks a lot

 

I also understand now problem métallic frame analysis I had in the past.

 

 

It is quite dangerous ! calculation is runing well without any warnings.

 

 

I am usual to make a separate model to design my rafts. It is fine.

 

 

Thanks