Instability at nodes

[Anonymous]

Hi! RG_Adsk really helped me with rigid links between roof space truss and roof, so i made model from beginning in Shell design. When I try to calculate model I get error message : instability (type 1 or type 2) at nodes... I've read about this messages on forum but i dont know how to solve a problem. If I ignore message I got too big deformations and forces. Am I doing something wrong on my model?Please help!

[Rafal.Gaweda]

File please.

[Anonymous]

Ooops sorry

[Rafal.Gaweda · Accepted solution]

This may help you to see where the instabilities are

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/API-macro-for-highlighting-nodes-with-instab...

p/3824275/highlight/true/page/3  - attachment from last message

Errors in your model:

-  node 185  should be on node 168 and many similar places

-  node 167 is not located on bar 171 and many similar places

- nodes  72 73 80 93 97 110 111 115 128 129 133 701 742to757 916to931  are not located on bars   97 102to138By12 123 135 149 165 947  (check in the same way as on screen shot above)

error 2 and 3 you can correct by Detailed Correct \ To line

- wrong rigid link between nodes  167 931   - there should be KRUTA VEZA 

[Anonymous]

Thank you very much!!!!!!!!!

I'm really sorry because i took your time. Thanks again 😄

[Rafal.Gaweda]

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