for a typical concentric brace to column/beam intersection, if I release the bending moments in the brace member, the node becomes instable (type 3) in the UX direction (of all directions)
Would anyone care to weigh in on the issue here? If I leave the brace fixed, this is fine. I can even release bending moments in both beams framing into the column and it's fine, it's only if i release the brace bending moments. I expect that, with the top of the column not released coming into the joint, there shouldn't be any problems.
Adding DSC option fixes the issue... but why?
Sparse Solver has this issue
Sparse M does not
Frontal and Skyline fail silently and do not solve.(may be a different problem)
relase instability.png