Unknown instability in shell model

Anonymous — Thu, 04 Apr 2019 14:19:07 GMT

Hello to all users in this forum,

My name is Marcos, I'm new at using RSA and this is my first post in this forum. I need some help with a I have created. My problem consists of what it follows.

I have created a model composed of walls and slabs, all of them created as shells. I have introduced all loads, releases, rigid links... and a problem appears when i run the model. A warning shows up and says "Instability (tipe 29) at joint." and that's all. The number of instability changes when i re-run the model (it sometimes says instability type 29, other times it says, instability type 23, other time it says instability type 555...) but it never points out which joint has the instability. I always skip this warning, and the model seems to run correctly, but I'm not sure that it is correctly run, or if that error will affect my results.

I would like to know why this warning appears, if it affects my results or it is not relevant, and how can I repair it.

I am using Robot Structural Analysis Professional 2013. I attach a screenshot of the warning that appears, maybe it can help.

Thank you for helping me.

Marcos.

Re: Unknown instability in shell model

Artur.Kosakowski — Fri, 05 Apr 2019 08:04:52 GMT

Hi @Anonymous

I recommend watching the recording of the 16th Robot webinar. Check https://forums.autodesk.com/t5/robot-structural-analysis-forum/robot-structural-analysis-webinars/td-p/5523337

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

topic Re: Unknown instability in shell model in Robot Structural Analysis Forum

Unknown instability in shell model

Re: Unknown instability in shell model