Learning Forum

[Ahmad Abubakar]

Dear fellows,

I am analyzing a steel hollow section in Ansys apdl. The problem that I face is that when I run the analysis there appears an error that degree of freedom exceeds the limit and there is a rigid body motion because the model is not constrained properly.

But the model is properly restrained since I have restrained it and glued/added volumes parts where necessary. The error does not appear when I reduce the elastic modulus from 210000 to 2100.

Any suggestion will be of great help.

[peteroznewman]

Please show more details about the model. Geometry, boundary conditions, loads, contacts, etc.

[Ahmad Abubakar]

There is a circular hollow steel section  with two braces connection on a chord. The braces and chord are sub-divided into volume (later added and glued)

 

[Ahmad Abubakar]

Both the chord ends are restrained, with one brace restrained in all directions. The second brace is subjected to displacement load of 10 in axial direction with other two directions being restrained. There is no contact function used, the model is combined by only glue and add commands.