RX Instability Type 2 for a frame with bar releases defined in pinned supports

RX Instability Type 2 for a frame with bar releases defined in pinned supports

peterkamal91
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RX Instability Type 2 for a frame with bar releases defined in pinned supports

peterkamal91
Enthusiast
Enthusiast

Dears,

 

 

-I have modeled a steel structure stage, after calculations i have got some instabilities (Type 2) in Rx which i couldn't recognize the reason of these instabilities -Could any one help me?

 

-I will attach the RSA file

Instability type 2.PNG

 

@peterkamal91 Artur Kosakowski edited the topic for better findability 

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Message 2 of 4

Artur.Kosakowski
Autodesk Support
Autodesk Support
Accepted solution

Hi, 

 

I have blocked RX in the definitions of supports and in the 3 supports where you have bars with releases.to prevent rotations of bars about their own axes. You may check values of MX in bars and RX in these reactions and adjust releases (e.g. use a partial ones) where needed.

 

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
Message 3 of 4

peterkamal91
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-Thank you very much for reply & help Artur. every thing is O.K 

 

-but I want to know the reason for that instability for that certain point ?! I mean there are similar points and there isn't any problem in it.

 

 

-I will attach the model again.

Similar points without errors.PNG

 

- The problem was in node no. 1245

 

 

 

 

 

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Message 4 of 4

Artur.Kosakowski
Autodesk Support
Autodesk Support

 I want to know the reason for that instability for that certain point ?! I mean there are similar points and there isn't any problem in it.

 

The solver may not report all of them at once however when you correct one location the next one will be reported when you calculate a model again. 

 

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