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Hey I have instability of type 3 in Rx direction in my truss ex.
Can someone tell me why?
Regards,
Solved! Go to Solution.
Solved by Mirko.Jurcevic. Go to Solution.
That's because your model is 3D and each node have 6 degrees of freedom.
With current supports your model is a mechanism because it can rotate around X axis.
You need to add new type of support in node 1 OR 7 to prevent rotation around X axis.
Look at attached image to see new support's constrains.