Autodesk Robot Structural Analysis

[#1]

Hi, 

Im trying to learn robot structual analysis professinal 2012 with help of robot structual analysis professinal 2010 training manual - metric version. im drawing exactly the same as in the manual, but im geting an error. instability (of type 1) detected at node 30 in direction RY. what have i done wrong? help please! 

[#2]

Possibly lack of accuracy in entering the model. Check if all bar/panels meet in common nodes please. If you can't find the reason attach the model you created.

[#3]

I can't find the problem. hope you can help me.

[#4 · Accepted solution]

Too many releases for bars meeting in the node 30 which results in having this node 'detached' from the model and rotation 'freely'. I'm attaching the corrected model with the release at this node removed from one of these 3 bars. As two others have the releases defined there will be no bending transfer anyway.

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