Recently I have done a steel frame analysis in Robot 2011 and Can you please answer the following questions:
1. what is the default connections in Robot among the beams or beams and columns in a 3D frame?
2. Is it a rigid or pinned connection?
3. If I apply a pinned-pinned release among the bars structure becomes unstable during the calculation, how can I solve this issue?
4. Do we need to apply pinned-pinned releases among the bars when we do a frame analysis?
Solved! Go to Solution.
As a default all connections between bars are fixed.
In case of instabilities please upload model or contact me by Private Message
Generally - too many releases (wrongly applied, giving instabilities - in this case errors in model).
You can not release bars on pinned supports (-> the same dofs released twice).
My vision of this model attached: fixed supports with released columns, bracings ( 101to108 128to137) as truss bars, Fixed-Pinned1 releases applied on structure, some relases changed to get rid of instabilities.